Approach to fever by age and immune status — viva

Opening (must-hit)

"I clear the threat gate first — any toxic or shocked febrile child gets ABCDE and a sepsis pathway. If the child is well-appearing, I stratify by age band, using Step-by-Step or the PECARN rule for young infants, and I check immune status explicitly because any immunocompromised child is an emergency regardless of how well they look." [1] [2] [5]

Branch A — The 2-week-old febrile neonate

Examiner: The 2-week-old has a rectal temperature of 38.3 °C but looks reasonably well. Candidate: Age under 28 days overrides appearance. This neonate gets a full septic work-up — blood, urine by catheter or suprapubic aspirate, and CSF — empiric antibiotics, and admission. Fever in a neonate is sepsis until proven otherwise. [1]

Branch B — The well-looking 6-week-old

Examiner: The 6-week-old is well-appearing with fever and no focus. Candidate: I apply a validated rule — Step-by-Step or the PECARN clinical prediction rule — using appearance, urinalysis, white cell count, neutrophil count, and procalcitonin. A low-risk infant may avoid lumbar puncture and discharge with close follow-up; a high-risk infant gets a full work-up and admission. [2] [3]

Branch C — Fever height as a discriminator

Examiner: The triage nurse says the temperature is only 38.0 °C, so maybe it is viral. Candidate: Height of fever does not predict serious bacterial infection. De and colleagues confirmed that body temperature lacks accuracy for detecting SBI. Behaviour, perfusion, and immune status are the real discriminators. A neonate at 38.0 °C is still sepsis until proven otherwise. [4]

Branch D — The febrile neutropenic child

Examiner: The 7-year-old on chemotherapy looks well but is neutropenic. Candidate: Appearance is not a reliable gate in immunocompromise. I take cultures from the central line and periphery, give empiric broad-spectrum antibiotics within 60 minutes, and admit. Febrile neutropenia can deteriorate within hours from gram-negative bacteraemia. [5]

Branch E — Caregiver concern

Examiner: The mother of the 6-week-old insists the baby is not right despite normal early observations. Candidate: Caregiver concern is data. Mills and colleagues showed it associates with critical illness. I escalate the assessment rather than reassure on numbers alone, and I keep the infant for observation or repeat assessment. [6]

Branch F — The safety-net

Examiner: You discharge a well 3-year-old with a viral illness. What do you tell the family? Candidate: I give a written, specific safety-net: return immediately for reduced interaction, work of breathing, poor perfusion, persistent fever, petechial or progressive rash, or if the parent feels the child is worse. I set a review in 24 to 48 hours if fever persists. Specific safety-netting improves outcomes for acutely ill children. [7]

Branch G — Antipyretic trap

Examiner: A colleague plans to discharge once the fever comes down with paracetamol. Candidate: I disagree. Antipyretic response is not a test for serious infection, and antipyretics are for comfort and fluid intake, not for deciding fitness for discharge. Disposition rests on appearance, perfusion, age, immune status, and a reliable safety-net, not on the temperature curve. [4]