Common Infections — MCQs
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A 33-year-old chef presents with a 10-day history of a slowly enlarging, painless nodule on his right hand following a minor cut while preparing seafood. The lesion is now 2cm in diameter with central ulceration and violaceous edges. He is systemically well with no fever. A swab taken 5 days ago showed no growth on standard culture media. What is the most appropriate next investigation?
A 41-year-old woman with systemic lupus erythematosus on prednisolone 15mg daily and mycophenolate mofetil presents with a 5-day history of a painful red nodule on her left shin. The lesion has not responded to a 3-day course of oral flucloxacillin prescribed by her GP. On examination, there is a 4cm violaceous nodule with central ulceration and a surrounding halo of erythema. She is apyrexial with normal inflammatory markers. What is the most likely diagnosis?
A hospital antimicrobial stewardship committee reviews quarterly prescribing data and identifies that the consumption of piperacillin-tazobactam has increased by 35% over the past year, while the incidence of Clostridioides difficile infection has risen by 28%. The increase in piperacillin-tazobactam use is primarily on medical wards for lower respiratory tract infections. Which intervention is most likely to address both concerns effectively?
A 48-year-old man with recurrent methicillin-sensitive Staphylococcus aureus (MSSA) skin abscesses presents for his third episode in six months. Previous episodes required incision and drainage. He works in healthcare and lives with his partner and two children. What is the most appropriate strategy to prevent further recurrence?
A 55-year-old woman presents with a 24-hour history of severe pain and swelling of her right forearm following a minor scratch from her cat. On examination, the forearm is markedly swollen, erythematous, and exquisitely tender with crepitus palpable in the soft tissues. Her temperature is 38.9°C, heart rate 118 bpm, and blood pressure 98/65 mmHg. Blood tests show WCC 18.5 × 10⁹/L, CRP 245 mg/L, and lactate 3.2 mmol/L. What is the most important immediate management step?
A 65-year-old man with type 2 diabetes presents to the Emergency Department with a 3-day history of a painful, swollen left lower leg. On examination, there is erythema, warmth, and tenderness extending from the ankle to mid-calf with a clearly demarcated edge. His temperature is 38.2°C, heart rate 95 bpm, and blood pressure 135/82 mmHg. Blood tests show WCC 14.2 × 10⁹/L and CRP 78 mg/L. Which of the following is the most appropriate first-line antibiotic treatment according to current UK guidance?
A hospital trust implements a comprehensive antimicrobial stewardship program including: electronic prescribing with decision support, weekly antimicrobial ward rounds, automatic 48-hour review prompts, and quarterly prescriber feedback. After 18 months, total antimicrobial consumption has decreased by 25%, but rates of Clostridioides difficile infection have remained unchanged. What is the most likely explanation for this finding?
A 71-year-old man with type 2 diabetes and chronic kidney disease stage 3b (eGFR 38 mL/min/1.73m²) presents with cellulitis of his right lower leg. He weighs 110 kg. You decide to prescribe intravenous flucloxacillin. What is the most appropriate dose?
A hospital antimicrobial stewardship team reviews prescribing for surgical site infections (SSIs) following colorectal surgery. Current practice is to prescribe intravenous co-amoxiclav and metronidazole for 7-10 days. Evidence-based guidelines recommend 3-5 days for uncomplicated SSIs. The team proposes reducing the default duration to 5 days. Which additional measure would most effectively support implementation of this change?
A 43-year-old woman who works in a nail salon presents with acute paronychia of her right middle finger. She reports frequent exposure to water and nail products. Examination reveals erythema, swelling, and purulent discharge from the lateral nail fold. What is the most likely causative organism?
Common Infections UK Medical PG Practice Questions and MCQs
Question 121: A 33-year-old chef presents with a 10-day history of a slowly enlarging, painless nodule on his right hand following a minor cut while preparing seafood. The lesion is now 2cm in diameter with central ulceration and violaceous edges. He is systemically well with no fever. A swab taken 5 days ago showed no growth on standard culture media. What is the most appropriate next investigation?
- A. Repeat wound swab for extended bacterial culture
- B. Tissue biopsy with culture in Lowenstein-Jensen medium at 30-32°C (Correct Answer)
- C. Blood cultures for aerobic and anaerobic organisms
- D. Serology for Bartonella henselae
- E. Patch testing for allergic contact dermatitis
Explanation: ***Tissue biopsy with culture in Lowenstein-Jensen medium at 30-32°C***- The clinical presentation (chef, minor cut while preparing seafood, slowly enlarging painless nodule with central ulceration and violaceous edges, no fever, no growth on standard culture) is classic for **Mycobacterium marinum** infection (Fish Tank Granuloma).- Diagnosis of **M. marinum** requires specialized culture conditions, including **Lowenstein-Jensen medium** (for mycobacteria) and incubation at a cooler temperature of **30-32°C**, which mimics the temperature of the skin surface where it thrives. A **tissue biopsy** provides adequate material.*Repeat wound swab for extended bacterial culture*- Standard wound swabs and conventional bacterial cultures are inadequate for detecting **atypical mycobacteria** like M. marinum due to their specific growth requirements and **acid-fast** nature.- A previous swab already yielded **no growth**, suggesting that a standard bacterial pathogen is not the cause, and merely repeating the same investigation is unlikely to be diagnostic.*Blood cultures for aerobic and anaerobic organisms*- The patient is **systemically well** and **afebrile**, which strongly indicates a localized skin infection rather than a systemic or disseminated process.- **Mycobacterium marinum** is typically a cutaneous infection and rarely causes bacteremia; it also would not grow in standard aerobic or anaerobic blood culture media.*Serology for Bartonella henselae*- While **Bartonella henselae** (Cat Scratch Disease) can cause skin lesions and regional lymphadenopathy, it is primarily associated with **cat exposure**, not seafood-related injuries.- The specific history of a cut during **seafood preparation** is a highly specific clue pointing towards **M. marinum** rather than Bartonella.*Patch testing for allergic contact dermatitis*- **Allergic contact dermatitis** typically manifests as an intensely **pruritic, erythematous, vesicular, or papular rash** in response to an allergen, often with well-demarcated borders.- The lesion described is a **painless, slowly enlarging nodule with central ulceration** following a penetrating injury, which is inconsistent with the presentation of allergic contact dermatitis.
Question 122: A 41-year-old woman with systemic lupus erythematosus on prednisolone 15mg daily and mycophenolate mofetil presents with a 5-day history of a painful red nodule on her left shin. The lesion has not responded to a 3-day course of oral flucloxacillin prescribed by her GP. On examination, there is a 4cm violaceous nodule with central ulceration and a surrounding halo of erythema. She is apyrexial with normal inflammatory markers. What is the most likely diagnosis?
- A. Cellulitis with partial antibiotic response
- B. Cutaneous abscess requiring incision and drainage
- C. Pyoderma gangrenosum (Correct Answer)
- D. Mycobacterium marinum infection
- E. Cutaneous vasculitis secondary to SLE
Explanation: ***Pyoderma gangrenosum*** - This diagnosis is strongly suggested by the description of a **painful, violaceous nodule with central ulceration** and a surrounding **halo of erythema** on the shin, which is classic for a **neutrophilic dermatosis**. - The patient's history of **SLE** and being on immunosuppressants, combined with the **failure to respond to oral flucloxacillin** and **normal inflammatory markers** (apyrexial), makes an infectious etiology unlikely and supports an inflammatory cause. *Cellulitis with partial antibiotic response* - **Cellulitis** typically presents with diffuse, spreading erythema, warmth, and tenderness, often accompanied by systemic signs like **fever** or elevated **CRP**, none of which are present here. - The discrete **violaceous nodule with central ulceration** is not characteristic of a typical bacterial cellulitis, and the lack of improvement after a standard course of antibiotics further argues against it. *Cutaneous abscess requiring incision and drainage* - An **abscess** is usually a localized collection of pus, often fluctuant. The described **violaceous nodule with central ulceration** is morphologically distinct from a simple abscess. - Surgical intervention like **incision and drainage** is generally contraindicated in **pyoderma gangrenosum** due to the risk of **pathergy**, where trauma can exacerbate the lesion. *Mycobacterium marinum infection* - **M. marinum** infections typically occur after exposure to **contaminated water** and usually manifest as **slow-growing papules, nodules, or ulcers**, often with a **sporotrichoid spread** over weeks to months. - A 5-day history is too acute for **M. marinum** infection, which has a much more indolent course. *Cutaneous vasculitis secondary to SLE* - **Cutaneous vasculitis** in SLE typically presents as **palpable purpura**, livedo reticularis, splinter hemorrhages, or small punctate infarcts, reflecting inflammation of small blood vessels. - The isolated **large, violaceous, ulcerating nodule with an undermined border** is not the typical presentation for cutaneous vasculitis, which usually involves multiple lesions or a different morphology.
Question 123: A hospital antimicrobial stewardship committee reviews quarterly prescribing data and identifies that the consumption of piperacillin-tazobactam has increased by 35% over the past year, while the incidence of Clostridioides difficile infection has risen by 28%. The increase in piperacillin-tazobactam use is primarily on medical wards for lower respiratory tract infections. Which intervention is most likely to address both concerns effectively?
- A. Replace piperacillin-tazobactam with meropenem as first-line therapy for pneumonia
- B. Implement automatic stop dates for all piperacillin-tazobactam prescriptions at 48 hours
- C. Develop and implement evidence-based guidelines promoting narrower spectrum antibiotics for community-acquired pneumonia with regular audit and feedback (Correct Answer)
- D. Introduce mandatory infectious diseases consultation for all patients prescribed piperacillin-tazobactam
- E. Restrict piperacillin-tazobactam to intensive care units only
Explanation: ***Develop and implement evidence-based guidelines promoting narrower spectrum antibiotics for community-acquired pneumonia with regular audit and feedback*** - This intervention directly targets the **root cause** of inappropriate broad-spectrum prescribing by promoting **narrower spectrum agents** sufficient for most lower respiratory tract infections, thereby reducing overall antibiotic pressure. - Combining **evidence-based guidelines** with **prospective audit and feedback** is a core antimicrobial stewardship strategy proven to effectively reduce broad-spectrum antibiotic consumption and the incidence of **Clostridioides difficile infection**. *Replace piperacillin-tazobactam with meropenem as first-line therapy for pneumonia* - Replacing one broad-spectrum antibiotic with an **even broader-spectrum carbapenem** like meropenem would exacerbate the problem, leading to increased selection pressure for **multi-drug resistant organisms (MDROs)**. - Carbapenems are associated with a **higher risk of C. difficile infection** and gut dysbiosis compared to piperacillin-tazobactam, worsening both concerns identified in the question. *Implement automatic stop dates for all piperacillin-tazobactam prescriptions at 48 hours* - While **automatic stop dates** are a useful antimicrobial stewardship tool for limiting duration, a universal 48-hour stop date for piperacillin-tazobactam is often too short for many legitimate indications, potentially leading to **under-treatment** or frequent manual overrides. - This approach primarily addresses the **duration of therapy** but does not address the fundamental issue of **inappropriate initial selection** of a broad-spectrum antibiotic when a narrower agent might have been sufficient for a lower respiratory tract infection. *Introduce mandatory infectious diseases consultation for all patients prescribed piperacillin-tazobactam* - Mandating **infectious diseases (ID) consultation** for every piperacillin-tazobactam prescription is **impractical and not scalable** given the high volume of prescriptions and limited ID specialist resources. - This strategy could lead to significant **delays in initiating appropriate therapy** and is not the most efficient population-level intervention for general medical wards. *Restrict piperacillin-tazobactam to intensive care units only* - Such a **drastic restriction** is overly rigid and could compromise care for patients on general medical wards with legitimate indications for piperacillin-tazobactam, such as severe **hospital-acquired pneumonia** or **neutropenic sepsis**. - This approach often leads to **antibiotic displacement** or "squeezing the balloon," where clinicians switch to other equally broad or inappropriate antibiotics without addressing the underlying issue of rational prescribing.
Question 124: A 48-year-old man with recurrent methicillin-sensitive Staphylococcus aureus (MSSA) skin abscesses presents for his third episode in six months. Previous episodes required incision and drainage. He works in healthcare and lives with his partner and two children. What is the most appropriate strategy to prevent further recurrence?
- A. Prescribe prophylactic oral flucloxacillin for 6 months
- B. Offer decolonisation therapy with nasal mupirocin and chlorhexidine body wash, and screen household contacts (Correct Answer)
- C. Prescribe prophylactic oral clindamycin for 3 months
- D. Advise improved hand hygiene only and reassure that recurrence is uncommon
- E. Recommend surgical excision of affected skin areas and hair follicles
Explanation: ***Offer decolonisation therapy with nasal mupirocin and chlorhexidine body wash, and screen household contacts*** - Recurrent **Staphylococcus aureus** infections, especially skin abscesses, often indicate persistent **colonization**, typically in the **nares** and on the skin. Decolonization therapy aims to eradicate this reservoir. - The patient's **healthcare profession** and **household contacts** increase the risk of both acquiring and transmitting **S. aureus**, making screening and decolonization of contacts crucial to prevent re-colonization. *Prescribe prophylactic oral flucloxacillin for 6 months* - Long-term **oral antibiotic prophylaxis** like flucloxacillin is generally not recommended for recurrent MSSA skin infections due to the high risk of **antibiotic resistance** development and potential adverse effects. - Systemic antibiotics are less effective than topical decolonization regimens at eradicating superficial **nasal and skin carriage** which drives recurrent infections. *Prescribe prophylactic oral clindamycin for 3 months* - Similar to other oral antibiotics, **clindamycin prophylaxis** for recurrent S. aureus is discouraged due to risks like **Clostridioides difficile infection** and fostering resistance. - Its use is typically reserved for treatment of active infections, often in cases of **beta-lactam allergy** or specific susceptibilities, not as a primary decolonization strategy. *Advise improved hand hygiene only and reassure that recurrence is uncommon* - While **hand hygiene** is important, it is usually insufficient on its own to eliminate established **S. aureus colonization** in individuals with recurrent infections. - Reassuring that recurrence is uncommon is incorrect; individuals who are **colonized** with S. aureus are at a significantly **higher risk** for recurrent infections. *Recommend surgical excision of affected skin areas and hair follicles* - **Surgical excision** is a treatment for active or complicated abscesses, but it is an overly invasive and impractical strategy for preventing recurrent widespread skin abscesses related to colonization. - This approach would not address the **nasal carriage** or other colonized skin sites that are the primary source of recurrent infections.
Question 125: A 55-year-old woman presents with a 24-hour history of severe pain and swelling of her right forearm following a minor scratch from her cat. On examination, the forearm is markedly swollen, erythematous, and exquisitely tender with crepitus palpable in the soft tissues. Her temperature is 38.9°C, heart rate 118 bpm, and blood pressure 98/65 mmHg. Blood tests show WCC 18.5 × 10⁹/L, CRP 245 mg/L, and lactate 3.2 mmol/L. What is the most important immediate management step?
- A. Start intravenous co-amoxiclav and refer for urgent surgical assessment (Correct Answer)
- B. Start oral co-amoxiclav and arrange outpatient follow-up in 48 hours
- C. Perform incision and drainage under local anaesthesia in the Emergency Department
- D. Obtain blood cultures and await results before starting antibiotics
- E. Start intravenous flucloxacillin and request ultrasound of the forearm
Explanation: ***Start intravenous co-amoxiclav and refer for urgent surgical assessment***- The presence of **crepitus**, severe pain, and **systemic toxicity** (hypotension, raised lactate, fever, tachycardia) strongly indicates **necrotising fasciitis**, which is a surgical emergency.- Immediate **surgical debridement** is crucial, and IV **co-amoxiclav** provides appropriate broad-spectrum coverage, including for **Pasteurella multocida** and anaerobic organisms associated with cat scratches.*Start oral co-amoxiclav and arrange outpatient follow-up in 48 hours*- The patient is in **septic shock** with high inflammatory markers and signs of organ dysfunction, making oral therapy and outpatient management life-threateningly inappropriate.- **Necrotising fasciitis** progresses rapidly (within hours) and requires urgent hospitalization for aggressive **intravenous resuscitation** and definitive surgical intervention.*Perform incision and drainage under local anaesthesia in the Emergency Department*- **Necrotising fasciitis** involves the deep fascial planes and requires extensive exploration and **wide radical debridement** in an operating theatre under general anesthesia.- Localized incision and drainage is insufficient for the widespread tissue necrosis and **gas-forming infection** indicated by the crepitus.*Obtain blood cultures and await results before starting antibiotics*- While blood cultures are essential, delaying antibiotic administration in a septic patient with suspected **necrotising fasciitis** significantly increases morbidity and mortality.- Empiric **broad-spectrum antibiotics** should be initiated immediately after cultures are drawn as part of the **Sepsis Six** protocol.*Start intravenous flucloxacillin and request ultrasound of the forearm*- **Flucloxacillin** is primarily active against staphylococci and streptococci but lacks reliable coverage for **Pasteurella multocida**, which is a common pathogen in cat bite/scratch infections.- Clinical diagnosis of **necrotising fasciitis** is paramount; requesting an **ultrasound** causes a dangerous delay in essential **surgical intervention**, which is time-critical.
Question 126: A 65-year-old man with type 2 diabetes presents to the Emergency Department with a 3-day history of a painful, swollen left lower leg. On examination, there is erythema, warmth, and tenderness extending from the ankle to mid-calf with a clearly demarcated edge. His temperature is 38.2°C, heart rate 95 bpm, and blood pressure 135/82 mmHg. Blood tests show WCC 14.2 × 10⁹/L and CRP 78 mg/L. Which of the following is the most appropriate first-line antibiotic treatment according to current UK guidance?
- A. Intravenous flucloxacillin (Correct Answer)
- B. Oral flucloxacillin
- C. Oral co-amoxiclav
- D. Intravenous vancomycin
- E. Oral doxycycline
Explanation: ***Intravenous flucloxacillin***- This patient presents with signs of **systemic infection** (fever, tachycardia, raised WCC and CRP) in addition to localized cellulitis, which indicates severe cellulitis, often classified as **Eron Class III** or higher, requiring **intravenous antibiotics**.- **Flucloxacillin** is the recommended first-line agent in the UK for cellulitis as it effectively covers the most common causative bacteria: **Streptococcus pyogenes** and **methicillin-sensitive Staphylococcus aureus**.*Oral flucloxacillin*- Oral flucloxacillin is appropriate for **mild cellulitis** (Eron Class I) without systemic features, but this patient's **fever** and elevated inflammatory markers necessitate the more rapid and higher tissue concentrations achieved with **intravenous administration**.- The presence of **systemic inflammatory response** suggests a need for hospital admission and parenteral therapy, making oral treatment insufficient.*Oral co-amoxiclav*- Co-amoxiclav is a **broader-spectrum antibiotic** typically reserved for specific types of cellulitis, such as **facial cellulitis**, **animal/human bites**, or when **anaerobic infection** is suspected.- Its use as first-line for uncomplicated limb cellulitis is discouraged to minimize the development of **antimicrobial resistance** without providing additional clinical benefit.*Intravenous vancomycin*- Intravenous vancomycin is primarily indicated for suspected or confirmed **MRSA infections** or in patients with a **severe penicillin allergy**.- There is no clinical indication for MRSA in this case, and flucloxacillin is superior for typical **methicillin-sensitive Gram-positive cocci**.*Oral doxycycline*- Oral doxycycline is an alternative for cellulitis in patients with **penicillin allergy** or for specific atypical pathogens, but it is not the standard first-line treatment for severe cellulitis.- For a patient with significant **systemic signs of infection**, an oral antibiotic alone would be inadequate, and intravenous therapy is required.
Question 127: A hospital trust implements a comprehensive antimicrobial stewardship program including: electronic prescribing with decision support, weekly antimicrobial ward rounds, automatic 48-hour review prompts, and quarterly prescriber feedback. After 18 months, total antimicrobial consumption has decreased by 25%, but rates of Clostridioides difficile infection have remained unchanged. What is the most likely explanation for this finding?
- A. The intervention has failed as reduced antimicrobial use should decrease C. difficile rates
- B. The reduction in antimicrobial use is insufficient to impact C. difficile rates which require >40% reduction
- C. Other factors such as infection control practices, patient case mix, or environmental contamination may be more important determinants of C. difficile rates than antimicrobial consumption alone (Correct Answer)
- D. There is a lag period of at least 3 years before changes in antimicrobial consumption affect C. difficile rates
- E. C. difficile rates are increasing in the community and offsetting any hospital reduction
Explanation: ***Other factors such as infection control practices, patient case mix, or environmental contamination may be more important determinants of C. difficile rates than antimicrobial consumption alone*** - Successful reduction in total **antimicrobial consumption** does not guarantee clinical improvement in CDI rates if other transmission factors like **hand hygiene** or **environmental cleaning** are suboptimal. - The specific **antibiotic class** targeted matters; a 25% reduction in low-risk agents may not impact CDI rates as much as reducing high-risk "4C" antibiotics (**Clindamycin, Cephalosporins, Co-amoxiclav, Ciprofloxacin**). *The intervention has failed as reduced antimicrobial use should decrease C. difficile rates* - The intervention was successful in its primary goal of reducing **antimicrobial consumption** by 25%, demonstrating effective **stewardship** processes. - Stewardship success is multifaceted and cannot be deemed a failure based on a single variable like **C. difficile** incidence when other local factors are at play. *The reduction in antimicrobial use is insufficient to impact C. difficile rates which require >40% reduction* - There is no evidence-based "threshold" such as a **40% reduction** required to see a shift in CDI incidence; improvements can often be seen with smaller, more targeted shifts. - Focus should be on the **quality of prescribing** and the reduction of **high-risk agents** rather than just a quantitative percentage of total volume. *There is a lag period of at least 3 years before changes in antimicrobial consumption affect C. difficile rates* - Hospital CDI rates typically respond to significant shifts in **antibiotic policy** or **infection control** much faster than a **3-year lag** period. - Changes in **gut microbiome** susceptibility and environmental spore load can reflect in hospital outcomes within months of implementing effective **stewardship**. *C. difficile rates are increasing in the community and offsetting any hospital reduction* - While **community-associated CDI** is rising, it does not explain static rates in a hospital setting if **nosocomial transmission** and stewardship are being addressed correctly. - This explanation ignores the critical role of the **hospital environment** and internal **infection prevention** measures in managing institutional outbreaks.
Question 128: A 71-year-old man with type 2 diabetes and chronic kidney disease stage 3b (eGFR 38 mL/min/1.73m²) presents with cellulitis of his right lower leg. He weighs 110 kg. You decide to prescribe intravenous flucloxacillin. What is the most appropriate dose?
- A. Flucloxacillin 1g four times daily
- B. Flucloxacillin 2g four times daily (Correct Answer)
- C. Flucloxacillin 500mg four times daily
- D. Flucloxacillin 1g twice daily
- E. Flucloxacillin 2g twice daily
Explanation: ***Flucloxacillin 2g four times daily*** - For severe **cellulitis** requiring intravenous therapy, the standard adult dose is 2g four times daily to ensure adequate tissue penetration and efficacy against **Staphylococcus aureus** and **Streptococci**. - Although the patient has **CKD stage 3b**, flucloxacillin does not require dose adjustment in renal impairment as it is primarily **metabolized by the liver**. *Flucloxacillin 1g four times daily* - This is the standard dose for **mild to moderate** infections, but it is insufficient for a severe case of cellulitis in a patient weighing **110 kg** with **diabetes**. - Lower doses increase the risk of **treatment failure** and antibiotic resistance in significant skin and soft tissue infections. *Flucloxacillin 500mg four times daily* - This is typically an **oral dose** for mild skin infections and is inappropriate for a patient requiring **intravenous therapy** for cellulitis. - The volume of distribution in a **110 kg patient** would lead to sub-therapeutic plasma concentrations at this dosage. *Flucloxacillin 1g twice daily* - Flucloxacillin is a **time-dependent antibiotic** with a short half-life, requiring **frequent dosing** (usually four times daily) to maintain concentrations above the MIC. - Twice-daily dosing would result in periods where the drug concentration is too low to be effective, leading to **poor clinical outcomes**. *Flucloxacillin 2g twice daily* - Even with a higher individual dose, the **dosing interval** is too long to sustain the antimicrobial effect required for cellulitis. - Correct management of **severe cellulitis** always prioritizes the frequency of administration (QDS) over reduced intervals, regardless of renal function at this eGFR level.
Question 129: A hospital antimicrobial stewardship team reviews prescribing for surgical site infections (SSIs) following colorectal surgery. Current practice is to prescribe intravenous co-amoxiclav and metronidazole for 7-10 days. Evidence-based guidelines recommend 3-5 days for uncomplicated SSIs. The team proposes reducing the default duration to 5 days. Which additional measure would most effectively support implementation of this change?
- A. Send a one-time email to all surgical consultants informing them of the new policy
- B. Update the hospital antimicrobial formulary guidelines on the intranet
- C. Implement electronic prescribing alerts prompting review at 5 days with default stop date (Correct Answer)
- D. Conduct a teaching session for surgical junior doctors during their induction
- E. Place posters in surgical wards highlighting the recommended duration
Explanation: ***Implement electronic prescribing alerts prompting review at 5 days with default stop date***- This intervention leverages **electronic prescribing systems** to provide **point-of-care decision support**, actively guiding prescribers towards the recommended duration.- A **default stop date** at 5 days acts as a powerful **behavioral nudge**, requiring prescribers to consciously override the recommendation if a longer duration is deemed necessary, thereby improving compliance with stewardship goals.*Send a one-time email to all surgical consultants informing them of the new policy*- **Passive communication** methods like one-time emails often have limited impact, as they can be easily overlooked, forgotten, or not prioritized by busy clinicians.- This approach lacks **active reinforcement** at the time of prescribing, offering no direct prompting or feedback when decisions are being made.*Update the hospital antimicrobial formulary guidelines on the intranet*- While necessary for official documentation, simply updating **intranet guidelines** relies on clinicians actively seeking out and remembering the information, which is not an effective strategy for changing established prescribing habits.- It is a **passive dissemination** method that doesn't provide **real-time alerts** or decision support, making it less effective in influencing immediate prescribing behavior compared to active interventions.*Conduct a teaching session for surgical junior doctors during their induction*- Educational sessions are valuable for **knowledge transfer** but often have limited success in changing ingrained practice behaviors on their own, especially in dynamic clinical environments.- Junior doctors may be influenced more by senior colleagues' habits, and the impact of a single induction session can fade, especially given **staff rotation** and the lack of continuous reinforcement.*Place posters in surgical wards highlighting the recommended duration*- **Posters** are a form of **visual reminder** but are often subject to "banner blindness" and do not provide an active prompt or intervention at the crucial moment of prescribing.- This method offers no **direct feedback loop** or mechanism to ensure that the information is acted upon by individual prescribers, making its impact on behavioral change minimal.
Question 130: A 43-year-old woman who works in a nail salon presents with acute paronychia of her right middle finger. She reports frequent exposure to water and nail products. Examination reveals erythema, swelling, and purulent discharge from the lateral nail fold. What is the most likely causative organism?
- A. Staphylococcus aureus (Correct Answer)
- B. Candida albicans
- C. Pseudomonas aeruginosa
- D. Streptococcus pyogenes
- E. Herpes simplex virus
Explanation: ***Staphylococcus aureus*** - **Staphylococcus aureus** is the most common cause of **acute paronychia**, typically following minor trauma to the cuticle or nail fold and presenting with rapid onset of **purulent discharge**. - While the patient's occupation involves water exposure, the presence of **acute erythema, swelling, and pus** strongly points to a bacterial etiology over fungal causes. *Candida albicans* - **Candida albicans** is the primary cause of **chronic paronychia** (lasting >6 weeks), especially in those with frequent water exposure like nail salon workers. - It usually presents with **proximal nail fold** thickening and episodes of inflammation rather than acute, localized **purulent abscess** formation. *Pseudomonas aeruginosa* - **Pseudomonas aeruginosa** is associated with **chloronychia** (green nail syndrome) due to the production of **pyocyanin** pigment. - It tends to colonize the space between the nail plate and bed in **moist environments** but is not the standard cause of acute bacterial paronychia. *Streptococcus pyogenes* - **Streptococcus pyogenes** (Group A Strep) can cause acute paronychia but is clinically less frequent than **Staphylococcus aureus**. - It is more commonly associated with rapidly spreading **cellulitis** or lymphangitis if the infection extends beyond the nail fold. *Herpes simplex virus* - **Herpes simplex virus** causes **herpetic whitlow**, which is characterized by the presence of small, clear **vesicles** on an erythematous base. - It typically produces **tingling or burning pain** and should not be incised and drained, unlike the purulent discharge associated with bacterial paronychia.
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