Serious & Notifiable Infections — MCQs
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A 51-year-old man presents with a 9-week history of low-grade fever, weight loss, and lower back pain. He has a history of intravenous drug use. MRI spine shows destruction of the L3-L4 vertebral bodies with paravertebral abscess formation and disc space involvement. Three blood cultures are negative. CT-guided biopsy of the paravertebral collection is planned. What is the most likely diagnosis?
A 39-year-old woman with HIV infection (CD4 count 65 cells/mm³, not on ART) presents with a 5-week history of progressive headache and fever. MRI brain shows basal meningeal enhancement and multiple small enhancing lesions. Lumbar puncture shows: opening pressure 28 cm H₂O, white cells 45/μL (90% lymphocytes), protein 0.9 g/L, glucose 2.1 mmol/L (serum 5.5 mmol/L). India ink staining is positive. What is the most appropriate initial management?
A 62-year-old man with newly diagnosed sputum smear-positive pulmonary tuberculosis lives in a residential care home. He has been coughing for 6 weeks. The care home has 40 residents and 25 staff members. According to UK contact tracing guidelines, which of the following groups requires the most urgent assessment and screening?
A 26-year-old woman presents to the emergency department with a 16-hour history of severe headache, photophobia, and vomiting. She has fever of 38.9°C, neck stiffness, and positive Kernig's sign. CT head scan is normal. Lumbar puncture shows: opening pressure 24 cm H₂O, white cells 680/μL (85% neutrophils), protein 1.2 g/L, glucose 1.8 mmol/L (serum glucose 5.2 mmol/L). Gram stain shows Gram-positive diplococci. What is the most likely causative organism?
A 41-year-old man is diagnosed with smear-positive pulmonary tuberculosis. He reports drinking 80-90 units of alcohol per week and has stigmata of chronic liver disease on examination. Baseline blood tests show: bilirubin 32 μmol/L, ALT 88 U/L, AST 105 U/L, ALP 145 U/L, albumin 32 g/L, INR 1.4. Which one of the following treatment regimens is most appropriate for the initial phase?
According to current UK public health notification requirements, which of the following scenarios requires urgent notification to local health protection teams within 24 hours?
A 33-year-old man with HIV infection (CD4 count 180 cells/mm³) who has been on antiretroviral therapy for 6 months develops pulmonary tuberculosis. He is commenced on rifampicin, isoniazid, pyrazinamide, and ethambutol. His current ART regimen consists of tenofovir, emtricitabine, and efavirenz. What is the most appropriate management of his antiretroviral therapy?
A 47-year-old woman from Kazakhstan presents with a 12-week history of cough, fever, and weight loss. Chest X-ray shows bilateral upper zone cavitation. Three sputum samples are smear-positive for acid-fast bacilli. GeneXpert MTB/RIF testing detects Mycobacterium tuberculosis with rifampicin resistance. Culture and sensitivity testing is pending. What is the most appropriate initial management strategy according to UK guidelines?
A 9-month-old infant is brought to the emergency department with a 14-hour history of fever, high-pitched crying, and reluctance to feed. On examination, temperature is 39.2°C, heart rate 165 bpm, respiratory rate 45/min. The fontanelle is bulging and tense. The infant appears drowsy but irritable when handled. A non-blanching purpuric rash is noted on the trunk and limbs. What is the most appropriate immediate antimicrobial management before lumbar puncture?
A 56-year-old man with smear-positive pulmonary tuberculosis has been receiving rifampicin, isoniazid, pyrazinamide, and ethambutol for 2 months. His baseline liver function tests were normal. He now presents with jaundice, nausea, and abdominal discomfort. Blood tests show: bilirubin 85 μmol/L, ALT 450 U/L, AST 420 U/L, ALP 180 U/L. Which one of the following is the most appropriate immediate management?
Serious & Notifiable Infections UK Medical PG Practice Questions and MCQs
Question 81: A 51-year-old man presents with a 9-week history of low-grade fever, weight loss, and lower back pain. He has a history of intravenous drug use. MRI spine shows destruction of the L3-L4 vertebral bodies with paravertebral abscess formation and disc space involvement. Three blood cultures are negative. CT-guided biopsy of the paravertebral collection is planned. What is the most likely diagnosis?
- A. Pyogenic vertebral osteomyelitis due to Staphylococcus aureus
- B. Spinal tuberculosis (Pott's disease) (Correct Answer)
- C. Brucella spondylitis
- D. Fungal vertebral osteomyelitis
- E. Metastatic spinal malignancy with pathological fracture
Explanation: ***Spinal tuberculosis (Pott's disease)*** - The chronic course over **9 weeks** with constitutional symptoms like **low-grade fever** and **weight loss**, combined with a history of **intravenous drug use**, strongly suggests an indolent infection such as **Mycobacterium tuberculosis**. - MRI findings of **L3-L4 vertebral body destruction**, **disc space involvement**, and a large **paravertebral abscess** (often referred to as a **cold abscess**) are classic features of spinal tuberculosis, especially when **blood cultures are negative**. *Pyogenic vertebral osteomyelitis due to Staphylococcus aureus* - Pyogenic osteomyelitis, particularly from **Staphylococcus aureus**, typically presents with a more **acute onset** (days to a few weeks) and often higher-grade fevers. - **Blood cultures** are positive in a majority of cases (50-70%) of pyogenic osteomyelitis, making three negative cultures less consistent with this diagnosis despite the IV drug use history. *Brucella spondylitis* - This diagnosis typically requires specific epidemiological risk factors, such as **occupational exposure** to livestock or consumption of **unpasteurized dairy products**, which are not mentioned in the patient's history. - While it can cause vertebral involvement, the extensive **paravertebral abscess formation** and prominent **disc space destruction** are more characteristic of **Pott's disease**. *Fungal vertebral osteomyelitis* - Fungal osteomyelitis is generally rare and usually affects patients who are **severely immunocompromised**, though IV drug use can be a risk factor for some fungal infections. - The overall clinical and radiological picture, including the significant **paravertebral cold abscess**, aligns more closely with **tuberculosis** than a fungal etiology. *Metastatic spinal malignancy with pathological fracture* - Metastatic spinal malignancy typically causes **vertebral body destruction** but often **spares the intervertebral disc space**, which is involved in this case. - The presence of a significant **paravertebral abscess** is a hallmark of an **infectious process** and is not typically associated with metastatic cancer.
Question 82: A 39-year-old woman with HIV infection (CD4 count 65 cells/mm³, not on ART) presents with a 5-week history of progressive headache and fever. MRI brain shows basal meningeal enhancement and multiple small enhancing lesions. Lumbar puncture shows: opening pressure 28 cm H₂O, white cells 45/μL (90% lymphocytes), protein 0.9 g/L, glucose 2.1 mmol/L (serum 5.5 mmol/L). India ink staining is positive. What is the most appropriate initial management?
- A. Amphotericin B plus flucytosine for 2 weeks, then fluconazole consolidation
- B. High-dose fluconazole monotherapy 800 mg daily for 6-8 weeks
- C. Liposomal amphotericin B plus flucytosine for 2 weeks with therapeutic lumbar puncture (Correct Answer)
- D. Ceftriaxone and aciclovir until bacterial and viral causes are excluded
- E. Amphotericin B plus flucytosine for 6-8 weeks, then fluconazole maintenance
Explanation: ***Liposomal amphotericin B plus flucytosine for 2 weeks with therapeutic lumbar puncture*** - The diagnosis of **cryptococcal meningitis** is confirmed by positive **India ink staining** in an HIV patient with a low CD4 count; **liposomal amphotericin B** and **flucytosine** for 2 weeks is the recommended induction regimen. - Managing **raised intracranial pressure** (opening pressure >25 cm H₂O) with **therapeutic lumbar punctures** is a critical component of initial management to prevent mortality and neurological damage in cryptococcal meningitis. *Amphotericin B plus flucytosine for 2 weeks, then fluconazole consolidation* - While this option correctly outlines the antifungal classes and induction duration, it uses conventional **Amphotericin B** instead of **liposomal Amphotericin B**, which is preferred due to reduced **nephrotoxicity**. - Crucially, this option **fails to address the essential management of elevated intracranial pressure** (28 cm H₂O) with therapeutic lumbar punctures. *High-dose fluconazole monotherapy 800 mg daily for 6-8 weeks* - **Fluconazole monotherapy** is significantly less effective than combination therapy for induction and is associated with much higher **mortality rates** in HIV-associated cryptococcal meningitis. - Monotherapy is generally reserved for the **consolidation** or maintenance phase, or in very specific circumstances where combination therapy is not feasible. *Ceftriaxone and aciclovir until bacterial and viral causes are excluded* - This empirical regimen is inappropriate because the **India ink stain** has already provided a definitive diagnosis of **Cryptococcus neoformans** meningitis. - Delaying targeted **antifungal therapy** in a severely immunosuppressed patient with confirmed fungal meningitis can lead to rapid clinical deterioration and increased mortality. *Amphotericin B plus flucytosine for 6-8 weeks, then fluconazole maintenance* - The standard **induction duration** for cryptococcal meningitis is 2 weeks; extending this to 6-8 weeks would lead to unacceptable **toxicities** (e.g., bone marrow suppression, renal failure). - This regimen incorrectly skips the **consolidation phase** (typically 8 weeks of high-dose fluconazole) which follows induction and precedes long-term maintenance.
Question 83: A 62-year-old man with newly diagnosed sputum smear-positive pulmonary tuberculosis lives in a residential care home. He has been coughing for 6 weeks. The care home has 40 residents and 25 staff members. According to UK contact tracing guidelines, which of the following groups requires the most urgent assessment and screening?
- A. All residents and staff members who have had any contact with the index case
- B. Residents sharing the same dining room as the index case
- C. Residents and staff with more than 8 hours cumulative close contact in enclosed spaces (Correct Answer)
- D. All residents aged over 75 years regardless of contact duration
- E. Staff members who have provided direct personal care to the index case
Explanation: ***Residents and staff with more than 8 hours cumulative close contact in enclosed spaces*** - UK guidelines for TB contact tracing prioritize individuals with **prolonged close contact** in enclosed spaces, typically defined as **8 hours or more cumulatively**, due to the higher risk of airborne transmission. - This group requires the most urgent assessment for **active TB symptoms** and **latent TB infection (LTBI) testing** to prevent further spread within the vulnerable care home population. *All residents and staff members who have had any contact with the index case* - Screening every individual with any contact would be **overly extensive** and **resource-intensive** without targeting the highest-risk individuals effectively. - Contact tracing aims to identify those with **significant exposure**, rather than all casual contacts, to optimize public health interventions. *Residents sharing the same dining room as the index case* - While sharing a dining room involves contact, it usually represents **intermittent and less intense exposure** compared to prolonged close contact in a confined setting. - This level of contact typically falls outside the primary criteria for **urgent, targeted screening** unless other risk factors or identified transmissions necessitate broader investigation. *All residents aged over 75 years regardless of contact duration* - Although older age is a risk factor for **progression to active TB** once infected, the initial priority for urgent screening is based on the **likelihood of acquiring infection** through significant exposure. - Screening based solely on age, without considering contact duration, would miss younger individuals with high exposure and over-screen older individuals with minimal contact. *Staff members who have provided direct personal care to the index case* - Providing direct personal care indicates close contact, but the **cumulative duration** of this exposure, particularly if it exceeds the 8-hour threshold in an enclosed space, is the key determinant for urgent screening. - This option focuses only on staff and might exclude other residents who had equally or more significant **cumulative exposure** with the index case.
Question 84: A 26-year-old woman presents to the emergency department with a 16-hour history of severe headache, photophobia, and vomiting. She has fever of 38.9°C, neck stiffness, and positive Kernig's sign. CT head scan is normal. Lumbar puncture shows: opening pressure 24 cm H₂O, white cells 680/μL (85% neutrophils), protein 1.2 g/L, glucose 1.8 mmol/L (serum glucose 5.2 mmol/L). Gram stain shows Gram-positive diplococci. What is the most likely causative organism?
- A. Neisseria meningitidis
- B. Streptococcus pneumoniae (Correct Answer)
- C. Haemophilus influenzae type b
- D. Listeria monocytogenes
- E. Group B Streptococcus
Explanation: ***Streptococcus pneumoniae*** - The finding of **Gram-positive diplococci** on Gram stain from the CSF is the classic microbiological identification for *Streptococcus pneumoniae*. - This organism is the **most common cause** of bacterial meningitis in adults, consistent with the patient's acute symptoms, fever, and classic CSF findings of **neutrophilic pleocytosis**, elevated protein, and low glucose. *Neisseria meningitidis* - *Neisseria meningitidis* is a common cause of bacterial meningitis, but it appears as **Gram-negative diplococci** on Gram stain, not Gram-positive. - While it can present similarly, it is often associated with a **petechial or purpuric rash**, which is not described in this case. *Haemophilus influenzae type b* - *Haemophilus influenzae type b* is a **Gram-negative coccobacillus**, which contradicts the Gram-positive diplococci found in the patient's CSF. - The incidence of meningitis due to this organism has significantly decreased in developed countries due to widespread **Hib vaccination**. *Listeria monocytogenes* - *Listeria monocytogenes* is characterized as a **Gram-positive rod** (bacillus), not a diplococcus. - It primarily causes meningitis in specific populations, including **neonates, the elderly, pregnant women**, and **immunocompromised individuals**, which does not fit this healthy 26-year-old. *Group B Streptococcus* - While *Group B Streptococcus* are Gram-positive cocci, they typically appear in **chains** on Gram stain rather than as diplococci. - This organism is a primary cause of neonatal meningitis but is an **uncommon cause** of meningitis in healthy, non-pregnant adults.
Question 85: A 41-year-old man is diagnosed with smear-positive pulmonary tuberculosis. He reports drinking 80-90 units of alcohol per week and has stigmata of chronic liver disease on examination. Baseline blood tests show: bilirubin 32 μmol/L, ALT 88 U/L, AST 105 U/L, ALP 145 U/L, albumin 32 g/L, INR 1.4. Which one of the following treatment regimens is most appropriate for the initial phase?
- A. Rifampicin, isoniazid, pyrazinamide, and ethambutol for 2 months
- B. Isoniazid, rifampicin, and ethambutol for 2 months, avoiding pyrazinamide
- C. Streptomycin, isoniazid, rifampicin, and ethambutol for 2 months (Correct Answer)
- D. Rifampicin, levofloxacin, and ethambutol for 2 months
- E. Isoniazid, ethambutol, and levofloxacin for 3 months
Explanation: ***Streptomycin, isoniazid, rifampicin, and ethambutol for 2 months*** - This patient has **chronic liver disease** (CLD) and synthetic dysfunction (elevated INR, low albumin), making **Pyrazinamide** contraindicated as it is the most **hepatotoxic** first-line drug. - UK guidelines (NICE/BTS) recommend a modified initial regimen replacing Pyrazinamide with **Streptomycin** or a fluoroquinolone when baseline liver function is significantly impaired. *Rifampicin, isoniazid, pyrazinamide, and ethambutol for 2 months* - This is the standard quad-therapy for tuberculosis but is unsuitable here due to the presence of **stigmata of chronic liver disease** and high alcohol intake. - Including **Pyrazinamide** in this patient carries a high risk of precipitating **fulminant hepatic failure** or severe drug-induced liver injury. *Isoniazid, rifampicin, and ethambutol for 2 months, avoiding pyrazinamide* - While avoiding Pyrazinamide is correct, using only three drugs (HRE) in the intensive phase is generally insufficient for **smear-positive pulmonary TB** unless a fourth non-hepatotoxic drug is added. - Reducing the number of agents without adequate substitution increases the risk of developing **multi-drug resistant TB** (MDR-TB). *Rifampicin, levofloxacin, and ethambutol for 2 months* - This regimen excludes **Isoniazid**, which is a primary bactericidal agent and should be used if the liver disease allows for close monitoring. - Fluoroquinolone-based regimens are typically reserved for patients who cannot tolerate either **Rifampicin** or **Isoniazid**, or those with confirmed drug resistance. *Isoniazid, ethambutol, and levofloxacin for 3 months* - This regimen inappropriately excludes **Rifampicin**, which is the most potent sterilizing agent in the treatment of tuberculosis. - Excluding Rifampicin would significantly extend the total duration of treatment required (often up to 18-24 months) and is not the first-choice modification for **CLD**.
Question 86: According to current UK public health notification requirements, which of the following scenarios requires urgent notification to local health protection teams within 24 hours?
- A. A positive interferon-gamma release assay (IGRA) in an asymptomatic healthcare worker
- B. A positive culture for Mycobacterium tuberculosis from a lymph node biopsy
- C. A CSF sample showing lymphocytic pleocytosis with low glucose in suspected tuberculous meningitis
- D. Clinical suspicion of meningococcal disease before laboratory confirmation (Correct Answer)
- E. A positive Mantoux test (18 mm induration) in a contact of an index case
Explanation: ***Clinical suspicion of meningococcal disease before laboratory confirmation***- **Meningococcal disease** is an urgent public health priority due to its rapid progression and potential for **outbreaks**, requiring notification within **24 hours** on clinical suspicion alone.- Immediate notification allows health protection teams to initiate **chemoprophylaxis** for close contacts to prevent secondary cases even before lab results are back.*A positive interferon-gamma release assay (IGRA) in an asymptomatic healthcare worker*- An **IGRA** measures the immune response to TB bacteria but indicates **Latent Tuberculosis Infection (LTBI)**, which is not a notifiable condition under UK law for urgent notification.- Only **active Tuberculosis** is generally notifiable to health protection teams, as latent infection does not pose an immediate public health transmission risk.*A positive culture for Mycobacterium tuberculosis from a lymph node biopsy*- While **active Tuberculosis** is a notifiable disease in the UK, it generally does not require the same **immediate, same-day notification** as meningococcal disease unless it's a specific outbreak or highly transmissible site (e.g., pulmonary).- Notification of TB is usually based on **clinical diagnosis** or **laboratory confirmation**, but it lacks the extreme time-sensitivity of invasive bacterial meningitis for immediate 24-hour notification based solely on this result.*A CSF sample showing lymphocytic pleocytosis with low glucose in suspected tuberculous meningitis*- Suspected **TB meningitis** is a serious clinical diagnosis, but the notification requirement is triggered by the **clinician's suspicion** of active TB rather than the CSF biochemistry alone.- Compared to **meningococcal disease**, the public health response for TB contacts is less urgent than the immediate prophylaxis required for *Neisseria meningitidis* exposure.*A positive Mantoux test (18 mm induration) in a contact of an index case*- A positive **Mantoux test** (Tuberculin Skin Test) indicates exposure or infection but is a screening tool for **latent TB**, not a diagnosis of active, immediately notifiable disease.- Positive screening tests in contacts are managed through **TB clinical services** for prophylaxis or monitoring rather than urgent 24-hour statutory notification.
Question 87: A 33-year-old man with HIV infection (CD4 count 180 cells/mm³) who has been on antiretroviral therapy for 6 months develops pulmonary tuberculosis. He is commenced on rifampicin, isoniazid, pyrazinamide, and ethambutol. His current ART regimen consists of tenofovir, emtricitabine, and efavirenz. What is the most appropriate management of his antiretroviral therapy?
- A. Continue the current ART regimen unchanged (Correct Answer)
- B. Stop ART completely until TB treatment is completed
- C. Replace efavirenz with raltegravir due to drug interaction with rifampicin
- D. Increase the dose of efavirenz to 800 mg daily
- E. Replace efavirenz with boosted atazanavir
Explanation: ***Continue the current ART regimen unchanged*** - **Efavirenz (600 mg)** is the preferred non-nucleoside reverse transcriptase inhibitor (NNRTI) for co-administration with **rifampicin-based tuberculosis (TB) treatment** due to its favorable interaction profile. - Rifampicin is a potent **CYP3A4 inducer**, but standard-dose efavirenz maintains therapeutic levels, making dose adjustment typically unnecessary in adults. *Stop ART completely until TB treatment is completed* - Stopping ART in an HIV patient with a low **CD4 count (180 cells/mm³)** significantly increases the risk of mortality, AIDS progression, and further **opportunistic infections**. - Current guidelines strongly recommend **concurrent administration of ART and TB treatment** to improve survival and viral suppression. *Replace efavirenz with raltegravir due to drug interaction with rifampicin* - While **raltegravir** can be used with rifampicin, it requires a **dose increase to 800 mg twice daily** (from 400 mg twice daily) due to rifampicin's induction of UGT1A1. - Efavirenz is often preferred due to its established efficacy, once-daily dosing, and no need for dose adjustment with rifampicin in most adults. *Increase the dose of efavirenz to 800 mg daily* - Increasing the dose of efavirenz to **800 mg daily** is no longer routinely recommended, as studies have shown the standard **600 mg daily dose** is sufficient and efficacious when co-administered with rifampicin. - Higher doses of efavirenz are associated with increased **neuropsychiatric side effects** (e.g., dizziness, vivid dreams, insomnia) without providing additional clinical benefit. *Replace efavirenz with boosted atazanavir* - **Rifampicin** is a strong **CYP3A4 inducer** and drastically reduces plasma concentrations of most **protease inhibitors (PIs)**, including boosted atazanavir, leading to subtherapeutic levels and potential treatment failure. - Concomitant use of rifampicin with most boosted PIs is generally **contraindicated**; if a PI is essential, **rifabutin** is usually substituted for rifampicin as the anti-TB agent.
Question 88: A 47-year-old woman from Kazakhstan presents with a 12-week history of cough, fever, and weight loss. Chest X-ray shows bilateral upper zone cavitation. Three sputum samples are smear-positive for acid-fast bacilli. GeneXpert MTB/RIF testing detects Mycobacterium tuberculosis with rifampicin resistance. Culture and sensitivity testing is pending. What is the most appropriate initial management strategy according to UK guidelines?
- A. Start standard four-drug therapy (RHZE) and await full culture sensitivities
- B. Start rifampicin, isoniazid, pyrazinamide, and ethambutol plus moxifloxacin
- C. Refer urgently to specialist TB centre and initiate empirical MDR-TB regimen (Correct Answer)
- D. Start isoniazid, pyrazinamide, ethambutol, and levofloxacin pending sensitivities
- E. Await full culture and drug sensitivity testing before commencing any treatment
Explanation: ***Refer urgently to specialist TB centre and initiate empirical MDR-TB regimen*** - The detection of **rifampicin resistance** via GeneXpert is a strong and rapid indicator of **Multidrug-Resistant TB (MDR-TB)**, necessitating urgent referral to a specialist TB center. - UK guidelines mandate initiating an **empirical MDR-TB regimen** immediately, often comprising multiple second-line drugs, especially given the patient's origin from a **high MDR-TB burden country** like Kazakhstan and severe clinical presentation, to prevent progression and transmission. *Start standard four-drug therapy (RHZE) and await full culture sensitivities* - This approach is inappropriate because **rifampicin resistance** has been confirmed by GeneXpert, rendering the **standard RHZE regimen** largely ineffective. - Continuing a regimen that includes an ineffective drug like rifampicin would act as **functional monotherapy**, promoting the development of further drug resistance and treatment failure. *Start rifampicin, isoniazid, pyrazinamide, and ethambutol plus moxifloxacin* - Prescribing **rifampicin** when resistance is confirmed is contraindicated and renders the core of this regimen ineffective. - Adding only **moxifloxacin** to an otherwise failing first-line regimen for suspected MDR-TB is insufficient and risks developing **fluoroquinolone resistance** without achieving adequate treatment. *Start isoniazid, pyrazinamide, ethambutol, and levofloxacin pending sensitivities* - This regimen is inadequate for confirmed **rifampicin-resistant TB**, as most cases of rifampicin resistance are also resistant to **isoniazid** (making it MDR-TB). - An empirical MDR-TB regimen requires a more comprehensive approach, often involving **multiple second-line agents** from different classes, not just one fluoroquinolone. *Await full culture and drug sensitivity testing before commencing any treatment* - Delaying treatment for the several weeks required for **phenotypic culture and sensitivity results** is unsafe for a patient with symptomatic, smear-positive, cavitary, and potentially MDR-TB. - Immediate treatment initiation is critical to prevent **clinical deterioration**, reduce **mortality**, and minimize ongoing **public health transmission** from a highly infectious patient.
Question 89: A 9-month-old infant is brought to the emergency department with a 14-hour history of fever, high-pitched crying, and reluctance to feed. On examination, temperature is 39.2°C, heart rate 165 bpm, respiratory rate 45/min. The fontanelle is bulging and tense. The infant appears drowsy but irritable when handled. A non-blanching purpuric rash is noted on the trunk and limbs. What is the most appropriate immediate antimicrobial management before lumbar puncture?
- A. Intravenous ceftriaxone 80 mg/kg plus intravenous aciclovir 20 mg/kg
- B. Intramuscular benzylpenicillin 300 mg followed by urgent transfer
- C. Intravenous ceftriaxone 80 mg/kg plus intravenous amoxicillin 300 mg/kg per day (Correct Answer)
- D. Intravenous cefotaxime 50 mg/kg plus intravenous vancomycin 15 mg/kg
- E. Intravenous ceftriaxone 80 mg/kg as a single agent
Explanation: ***Intravenous ceftriaxone 80 mg/kg plus intravenous amoxicillin 300 mg/kg per day*** - The infant presents with classic features of **bacterial meningitis** and **meningococcal septicaemia**, indicated by fever, a **bulging fontanelle**, and a **non-blanching purpuric rash**. - While usually prioritized for those under 3 months, **amoxicillin** is added to a **third-generation cephalosporin** to provide essential coverage against **Listeria monocytogenes**, which is inherently resistant to cephalosporins. *Intravenous ceftriaxone 80 mg/kg plus intravenous aciclovir 20 mg/kg* - **Aciclovir** is indicated for suspected **herpetic encephalitis**, which typically presents with focal neurological signs or seizures rather than a purpuric rash. - This combination lacks **amoxicillin**, leaving the patient potentially unprotected against **Listeria** if guidelines for infants are being strictly followed. *Intramuscular benzylpenicillin 300 mg followed by urgent transfer* - **Intramuscular benzylpenicillin** is the treatment of choice in a **primary care** or pre-hospital setting when meningococcal disease is suspected and transfer is delayed. - Since the patient is already in the **emergency department**, definitive intravenous broad-spectrum antibiotics should be started immediately instead of single-agent penicillin. *Intravenous cefotaxime 50 mg/kg plus intravenous vancomycin 15 mg/kg* - **Vancomycin** is often added in regions with high rates of **penicillin-resistant Streptococcus pneumoniae**, but it is not the standard first-line addition for pediatric meningitis in many UK-based protocols unless specific resistance is suspected. - This regimen fails to include **amoxicillin**, which is the specific agent required to treat **Listeria monocytogenes**. *Intravenous ceftriaxone 80 mg/kg as a single agent* - While **ceftriaxone** provides excellent coverage for **Neisseria meningitidis** and **Streptococcus pneumoniae**, it has no activity against **Listeria**. - In the context of an infant presenting with serious systemic infection, dual therapy is preferred to ensure the broadest possible **bacterial coverage** until cultures return.
Question 90: A 56-year-old man with smear-positive pulmonary tuberculosis has been receiving rifampicin, isoniazid, pyrazinamide, and ethambutol for 2 months. His baseline liver function tests were normal. He now presents with jaundice, nausea, and abdominal discomfort. Blood tests show: bilirubin 85 μmol/L, ALT 450 U/L, AST 420 U/L, ALP 180 U/L. Which one of the following is the most appropriate immediate management?
- A. Continue all four drugs and add ursodeoxycholic acid for hepatoprotection
- B. Stop all anti-tuberculosis drugs immediately and arrange urgent hepatology review (Correct Answer)
- C. Continue rifampicin and ethambutol only, stop isoniazid and pyrazinamide
- D. Reduce the doses of all four drugs by 50% and monitor liver function weekly
- E. Stop isoniazid only and continue with the remaining three drugs
Explanation: ***Stop all anti-tuberculosis drugs immediately and arrange urgent hepatology review*** - The patient presents with **clinical jaundice** (bilirubin 85 μmol/L) and significantly elevated **ALT (450 U/L)** and **AST (420 U/L)**, indicating severe **drug-induced liver injury (DILI)**. - Current guidelines mandate immediate cessation of all potentially hepatotoxic anti-TB drugs (Rifampicin, Isoniazid, Pyrazinamide) in the presence of symptomatic hepatitis with **jaundice** to prevent progression to **acute liver failure**. *Continue all four drugs and add ursodeoxycholic acid for hepatoprotection* - Continuing all four drugs in the face of severe, symptomatic **hepatotoxicity** is dangerous and can lead to **life-threatening liver failure**. - **Ursodeoxycholic acid** is primarily used for cholestatic liver diseases and has no proven role in the acute management of **drug-induced hepatocellular injury** caused by anti-TB medications. *Continue rifampicin and ethambutol only, stop isoniazid and pyrazinamide* - While **Isoniazid** and **Pyrazinamide** are major contributors to hepatotoxicity, **Rifampicin** can also cause and exacerbate liver injury, often with a cholestatic or mixed pattern. - In severe DILI with jaundice, all hepatotoxic drugs must be stopped. A sequential reintroduction protocol, under specialist supervision, can be considered only after liver function has significantly improved. *Reduce the doses of all four drugs by 50% and monitor liver function weekly* - Reducing the dose is inadequate for managing acute, symptomatic **drug-induced liver injury** and does not mitigate the risk of ongoing hepatic damage. - This approach also carries the risk of developing **drug resistance** if the drug levels fall below therapeutic ranges, and weekly monitoring is too infrequent for acute, worsening hepatitis; immediate cessation is required. *Stop isoniazid only and continue with the remaining three drugs* - Although **Isoniazid** is a common cause of toxicity, it is impossible to definitively pinpoint a single causative drug without withdrawal and reintroduction, especially since **Pyrazinamide** is often considered the most hepatotoxic, and **Rifampicin** also contributes. - Continuing other hepatotoxic drugs like **Pyrazinamide** and **Rifampicin** in a patient with severe DILI and **jaundice** risks further liver damage and potentially fatal complications.
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