Feverish children - risk assessment and management
Exam Tips
- In OSCEs, explicitly state that parental report of fever is clinically valid even if the child is afebrile on arrival.
- Use the NICE traffic-light framework systematically; one red feature is enough to trigger urgent senior/secondary care escalation.
- Remember key age thresholds: under 3 months with temperature at least 38°C is high risk; age 3-6 months with temperature at least 39°C is amber risk.
- A fever lasting 5 days or more should trigger active consideration of Kawasaki disease, especially in infants who may show incomplete features.
- When discussing antipyretics, frame them as comfort measures (distress relief), not treatment of the underlying infection.
- For revision diagrams, review fever pathophysiology schematics and paediatric sepsis recognition charts (See Figure from page X in your core paediatrics text).
Definition
A feverish child (birth to 5 years in NICE risk tools) is an infant or young child with a measured temperature of at least 38.0°C, or a reliable parental report of fever even if afebrile at review. Fever is a host inflammatory response, usually to infection, and is not itself usually harmful; clinical risk comes from the underlying cause, particularly serious bacterial infection, sepsis, meningitis, pneumonia, UTI, or important non-infectious conditions such as Kawasaki disease.
Pathophysiology
Exogenous pyrogens (for example bacterial or viral products) trigger innate immune cells to release cytokines including IL-1, IL-6, and TNF-alpha. These mediators increase hypothalamic prostaglandin E2, raising the thermoregulatory set-point and causing heat-conserving/heat-generating responses (vasoconstriction, shivering, reduced heat loss), perceived clinically as fever and rigors. In children, most episodes are viral and self-limiting, but immature immunity (especially under 3 months), immunodeficiency, or invasive pathogens can lead to rapid progression to systemic inflammation, capillary leak, and organ dysfunction. Persistent fever (at least 5 days) should prompt reassessment for inflammatory vasculitic syndromes such as Kawasaki disease because delayed treatment increases coronary artery risk.
Risk Factors
- Age under 3 months (higher baseline risk of serious bacterial infection)
- Prematurity or perinatal complications (including maternal intrapartum fever)
- Known immunodeficiency or immunosuppression
- Incomplete or absent routine childhood immunizations
- Recent antibiotic exposure (may partially treat and mask bacterial illness)
- Recent travel to malaria-endemic regions or close contact with serious infectious disease
- Underlying chronic disease (for example renal/urological abnormalities predisposing to UTI)
Clinical Features
Symptoms
- Fever history (including parental report), duration, and peak recorded temperature
- Poor feeding, reduced oral intake, vomiting, or reduced urine/wet nappies
- Cough, breathlessness, coryzal symptoms, ear pain, sore throat
- Lethargy, reduced interaction, irritability, inconsolable crying
- Rash (especially non-blanching), limb pain, rigors
- Diarrhoea/abdominal pain, dysuria or malodorous urine
- Fever for 5 days or longer with possible Kawasaki features (conjunctivitis, mucosal change, extremity change, rash, cervical lymphadenopathy)
Signs
- Temperature at or above 38°C (noting antipyretics may transiently lower measured temperature)
- Traffic-light red colour signs: pale/mottled/ashen/blue appearance
- Traffic-light red activity signs: weak high-pitched or continuous cry, reduced consciousness, does not stay awake
- Respiratory compromise: grunting, severe chest indrawing, tachypnoea (over 60/min red; over 50 in 6-12 months amber; over 40 over 12 months amber), oxygen saturation 95% or less in air
- Circulatory/dehydration signs: CRT 3 seconds or more, tachycardia (over 160 under 12 months, over 150 age 12-24 months, over 140 age 2-5 years), dry mucosa, poor skin turgor
- Neurological/meningeal concern: bulging fontanelle, neck stiffness, focal signs, status epilepticus
- Non-blanching rash, focal limb swelling, or joint non-use (possible invasive bacterial disease)
Investigations
Management
Lifestyle Modifications
- Use NICE traffic-light risk assessment at every review and safety-net clearly (red flag symptoms, fluid intake, urine output, when to seek urgent help)
- Encourage regular fluids and monitor hydration; avoid over-wrapping/overheating
- Treat distress rather than targeting a specific temperature; fever alone is not an indication for aggressive treatment
- Reassess frequently if amber features, persistent fever, or diagnostic uncertainty
- Escalate urgently to paediatric emergency care for any red feature, age under 3 months with fever, or suspected sepsis/meningitis/Kawasaki disease
Pharmacological Treatment
Antipyretic/analgesic
- Paracetamol oral: 15 mg/kg per dose every 4-6 hours as needed (max 4 doses in 24 hours; max 60 mg/kg/day)
- Ibuprofen oral (age at least 3 months and weight over 5 kg): 5-10 mg/kg per dose every 6-8 hours (max 30 mg/kg/day)
Use one agent at a time for discomfort; only consider switching if distress persists before next dose. Do not give both routinely together. Avoid ibuprofen in dehydration, renal impairment, or suspected/confirmed chickenpox due to risk of severe skin/soft tissue complications.
Empiric parenteral antibiotics for suspected serious bacterial infection (local protocol guided)
- Ceftriaxone IV: commonly 80 mg/kg once daily (max 4 g daily) in severe sepsis/meningitis pathways
- If meningococcal disease strongly suspected before hospital transfer: benzylpenicillin IM/IV single stat dose (<1 year 300 mg, 1-9 years 600 mg, 10 years or older 1.2 g)
Give urgently in sepsis after cultures if this does not delay treatment. Check severe beta-lactam allergy history. Ceftriaxone should not be co-administered with calcium-containing IV solutions in neonates; neonatal regimens require specialist advice.
Condition-specific anti-inflammatory therapy
- Kawasaki disease: intravenous immunoglobulin 2 g/kg single infusion plus aspirin (specialist-directed paediatric dosing regimen)
Initiate under paediatric specialist care promptly to reduce coronary artery aneurysm risk; monitor cardiac status and inflammatory markers.
Complications
- Sepsis and septic shock with multiorgan dysfunction
- Bacterial meningitis/encephalitis with neurological sequelae (hearing loss, developmental impairment)
- Dehydration with electrolyte disturbance and acute kidney injury
- Febrile seizures (usually benign but can be frightening and occasionally complex)
- Pneumonia complications (parapneumonic effusion/empyema)
- Kawasaki-related coronary artery aneurysms if diagnosis or treatment is delayed
Prognosis
Most fever episodes in children are viral and resolve fully with supportive care. Prognosis worsens when risk features are missed, especially in infants under 3 months and children with red-flag physiology; timely recognition, escalation, and targeted treatment markedly reduce morbidity and mortality.