A sore throat in a young child – painful swallowing, refusal to eat, a flushed and miserable appearance – is one of the most common presentations to GPs and urgent care centres. The central clinical question is almost always the same: is this viral (which will resolve without antibiotics) or bacterial (which may benefit from them)?
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What Pharyngitis Is
Pharyngitis is inflammation of the pharynx – the back of the throat. In clinical practice, "sore throat" is used to describe both pharyngitis (inflammation limited to the pharynx) and tonsillitis (inflammation involving the tonsils). These frequently coexist and are often not distinguished.
In young children under 3 years, the presentation of pharyngitis is often non-specific: the child is febrile, miserable, off feeds, and drooling (because swallowing is uncomfortable) without being able to articulate that their throat hurts. Examination may show a red, inflamed posterior pharynx, and tonsils may be enlarged and red.
Viral vs Bacterial Pharyngitis
Around 80-90% of pharyngitis in children is viral. The most common viral causes are adenovirus, rhinovirus, parainfluenza, and influenza. Infectious mononucleosis (Epstein-Barr virus) can cause a severe pharyngitis in older children and teenagers, often associated with marked lymphadenopathy and significant fatigue.
Group A Streptococcus (GAS, or Streptococcus pyogenes) is the most clinically important bacterial cause. GAS pharyngitis is more common in school-age children (5-15 years) than in toddlers; it is uncommon in children under 3. Untreated GAS pharyngitis carries a small but real risk of rheumatic fever and glomerulonephritis – the main reasons antibiotic treatment for confirmed strep throat is recommended.
Clinical Assessment: FeverPAIN and Centor
Two scoring systems are commonly used to estimate the likelihood of bacterial pharyngitis:
The Centor criteria score points for tonsillar exudate, tender anterior cervical lymph nodes, fever, and absence of cough. The modified FeverPAIN score, developed by Mark Little at the University of Southampton and validated in UK primary care, adds specific fever thresholds and pus on tonsils (as opposed to general exudate) and has been incorporated into NICE guidance.
A low FeverPAIN score (0-1) suggests a viral cause and antibiotics are unlikely to be beneficial. A high score (4-5) suggests a bacterial cause is more likely and antibiotic treatment is reasonable.
UK NICE Guidance on Treatment
NICE guidance on acute sore throat (CG69 and updated NG84) recommends that most cases should be managed with self-care and not receive immediate antibiotics. The approach recommended is:
No antibiotic (score 0-1): advise on self-care; safety-net appropriately.
Delayed antibiotic (score 2-3): provide a delayed prescription to be used only if symptoms do not improve after 3-5 days.
Immediate antibiotic (score 4-5 or clinically indicated): phenoxymethylpenicillin (penicillin V) is first-line; amoxicillin should be avoided in suspected EBV infection (it causes a characteristic maculopapular rash in EBV).
Managing Symptoms at Home
For viral pharyngitis, which resolves without antibiotics, symptom management is the primary approach. Age-appropriate paracetamol or ibuprofen (ibuprofen from 3 months/5kg) reduces pain and fever. Adequate fluid intake is important; a child in pain with swallowing may become dehydrated if fluid intake drops significantly. Cold drinks and ice lollies can provide temporary symptom relief in older children.
Throat lozenges and sprays are generally not suitable for young toddlers due to choking risk.
When to Seek Urgent Assessment
Drooling with inability to swallow in a young child, stridor, a muffled or "hot potato" voice, and a child who holds their neck in a fixed position are all red flags for more serious conditions: epiglottitis (rare but life-threatening), peritonsillar abscess, or retropharyngeal abscess. These require emergency assessment.
Key Takeaways
Pharyngitis (inflammation of the pharynx, commonly called a sore throat) is overwhelmingly caused by viruses in young children and does not require antibiotics in most cases. Group A Streptococcus (strep throat) is the most important bacterial cause and is more common in school-age children than in toddlers. The Centor and modified FeverPAIN criteria help assess the likelihood of bacterial pharyngitis. UK NICE guidance recommends a delayed antibiotic prescribing strategy for most cases of acute sore throat. Throat swabs are not routinely recommended in primary care but can be useful in specific circumstances.
