A 12-month-old girl is brought to her pediatrician for a checkup and vaccines. The patient’s mother wants to send her to daycare but is worried about exposure to unvaccinated children and other potential sources of infection. The toddler was born at 39 weeks gestation via spontaneous vaginal delivery. She is up to date on all vaccines. She does not walk yet but stands in place and can say a few words. The toddler drinks formula and eats a mixture of soft vegetables and pureed meals. She has no current medications. On physical exam, the vital signs include: temperature 37.0°C (98.6°F), blood pressure 95/50 mm Hg, pulse 130/min, and respiratory rate 28/min. The patient is alert and responsive. The remainder of the exam is unremarkable. Which of the following is most appropriate for this patient at this visit?

Gross motor workup and evaluation

A 15-year-old boy is brought to the Emergency department by ambulance from school. He started the day with some body aches and joint pain but then had several episodes of vomiting and started complaining of a terrible headache. The school nurse called for emergency services. The boy was born at 39 weeks gestation via spontaneous vaginal delivery. He is up to date on all vaccines and is meeting all developmental milestones. Past medical history is noncontributory. He is a good student and enjoys sports. At the hospital, his blood pressure is 120/80 mm Hg, heart rate is 105/min, respiratory rate is 21/min, and his temperature is 38.9°C (102.0°F). On physical exam, he appears drowsy with neck stiffness and sensitivity to light. Kernig’s sign is positive. An ophthalmic exam is performed followed by a lumbar puncture. An aliquot of cerebrospinal fluid is sent to microbiology. A gram stain shows gram-negative diplococci. A smear is prepared on blood agar and grows round, smooth, convex colonies with clearly defined edges. Which of the following would identify the described pathogen?

Oxidase-positive and ferments glucose and maltose

Oxidase-positive test and ferments glucose only

Catalase-negative and oxidase-positive

No growth on Thayer-Martin medium

A 24-year-old newly immigrated mother arrives to the clinic to discuss breastfeeding options for her newborn child. Her medical history is unclear as she has recently arrived from Sub-Saharan Africa. You tell her that unfortunately she will not be able to breastfeed until further testing is performed. Which of the following infections is an absolute contraindication to breastfeeding?

Human Immunodeficiency Virus (HIV)

A 16-month-old male patient, with no significant past medical history, is brought into the emergency department for the second time in 5 days with tachypnea, expiratory wheezes and hypoxia. The patient presented to the emergency department initially due to rhinorrhea, fever and cough. He was treated with nasal suctioning and discharged home. The mother states that, over the past 5 days, the patient has started breathing faster with chest retractions. His vital signs are significant for a temperature of 100.7 F, respiratory rate of 45 and oxygen saturation of 90%. What is the most appropriate treatment for this patient?

Nasal suctioning, oxygen therapy and IV fluids

Albuterol, ipratropium and IV methylprednisolone

IV cefotaxime and IV vancomycin

Humidified oxygen, racemic epinephrine and intravenous (IV) dexamethasone

Nursery outbreaks for USMLE Step 2 CK: High-Yield Pediatrics Lessons

Nursery Outbreaks - The Tiny Troublemakers

Definition: An outbreak is defined as ≥ 2 hospital-acquired (nosocomial) infections that are epidemiologically linked by time and place.
Common Pathogens:
- Bacteria: Staphylococcus aureus (including MRSA), Klebsiella pneumoniae, E. coli, Pseudomonas aeruginosa.
- Viruses: Respiratory Syncytial Virus (RSV), Rotavirus.
- Fungi: Candida albicans.

⭐ Klebsiella pneumoniae is notorious for causing sepsis and meningitis outbreaks in NICUs, often demonstrating multidrug resistance and spreading via contaminated sinks or ventilator equipment.

Transmission - How Bugs Travel

Sources: Infected or colonized infants, healthcare workers (HCWs), and contaminated equipment/environment.
Modes of Transmission:
- Contact: The MOST COMMON route, primarily via the hands of HCWs.
- Common Source: Contaminated enteral feeds, IV fluids, or medications.
- Airborne: Rare in NICU settings (e.g., Varicella).
Host Factors: Prematurity, Low Birth Weight (LBW), presence of invasive devices (e.g., central lines, ventilators), and parenteral nutrition.

⭐ The hands of healthcare workers are the most frequent vehicle for transmitting pathogens in a nursery. Strict hand hygiene is the single most important preventive measure.

Investigation & Control - The Action Plan

Outbreak Investigation Sequence: A systematic, stepwise approach is crucial for effective containment and prevention of further spread.

Key Immediate Control Measures:
- Strict hand hygiene & standard precautions for all.
- Isolate cases; implement contact precautions.
- Cohorting of both infants and staff (infected/exposed together).
- Enhanced environmental cleaning & disinfection.

⭐ Exam Favourite: A nursery outbreak is typically defined as ≥2 epidemiologically linked cases of the same infection. For highly virulent organisms (e.g., Group A Streptococcus), a single case warrants a full investigation.

Prevention - Building the Fort

WHO 5 Moments for Hand Hygiene in Healthcare

Hand Hygiene: The Cornerstone
- Adherence to WHO’s 5 Moments is critical.
- Use alcohol-based hand rub or soap and water.
Standard Precautions: Applied universally.
- Personal Protective Equipment (PPE): Gloves, gowns, masks.
- Safe injection practices & sharps disposal.
- Respiratory hygiene and cough etiquette.
Aseptic Precautions: For all invasive procedures (e.g., line insertion, lumbar puncture).
Antibiotic Stewardship: Prevents resistance (e.g., ESBL Klebsiella). Avoid routine antibiotic use.
Staff Health: Regular screening, immunization, and strict sick leave policies for personnel.

⭐ The single most effective measure to prevent healthcare-associated infections is meticulous hand hygiene.

High‑Yield Points - ⚡ Biggest Takeaways

Most common organisms in nursery outbreaks include Staphylococcus aureus, Klebsiella, E. coli, and Pseudomonas.

S. aureus typically causes skin pustules and abscesses; it is often carried by asymptomatic staff.

Klebsiella is notorious for causing sepsis and meningitis, frequently linked to contaminated equipment.

The single most effective preventive measure is strict hand hygiene by all healthcare personnel.

Cohort nursing - grouping infected infants with dedicated staff - is crucial for outbreak control.

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Nursery outbreaks