Pressure for antibiotic prescriptions in children's illness — from parents who want to do something active for a sick child, and sometimes from clinicians who find it easier to prescribe than to explain — is one of the primary drivers of antimicrobial resistance globally. Understanding which childhood illnesses are caused by bacteria (and therefore potentially treatable with antibiotics) and which are caused by viruses (and therefore not) changes both how parents respond to illness and how they engage with clinicians about treatment.
This is not an argument against antibiotics, which are essential medicines that save lives and that children genuinely need in specific circumstances. It is an argument for using them when they are needed and not using them when they are not.
Healthbooq provides parents with evidence-based guidance on managing common childhood illnesses, including when to seek medical assessment and what to expect from treatment.
Viral versus Bacterial Infection
The fundamental distinction is between viral and bacterial infections. Viruses — including rhinovirus (the main cause of colds), influenza, RSV, rotavirus, adenovirus, and many others — cannot be killed by antibiotics. A child with a viral illness who is given an antibiotic receives a medicine that has no effect on the pathogen making them ill, while experiencing the side effects of the antibiotic (diarrhoea, rash, gut microbiome disruption) and contributing to the development of antibiotic resistance in the wider environment.
Bacterial infections — including most urinary tract infections, some ear infections, some cases of tonsillitis (specifically Group A Streptococcal tonsillitis), bacterial pneumonia, whooping cough, and others — are treatable with the appropriate antibiotic and in these cases antibiotics genuinely matter.
The challenge for parents is that it is not always obvious from symptoms whether an infection is viral or bacterial. A child with a painful throat, fever, and difficulty swallowing may have a viral upper respiratory infection or may have streptococcal tonsillitis. A child with ear pain and fever after a cold may have viral otitis media (middle ear infection) — which is extremely common and does not respond to antibiotics — or bacterial otitis media, which does. Clinicians use examination findings, symptom duration and trajectory, and sometimes rapid tests to make this distinction.
Common Childhood Illnesses That Do Not Require Antibiotics
Colds and upper respiratory infections (the large majority of them): viral, self-limiting, managed with symptom relief. Green nasal discharge — which commonly develops in the second week of a cold as the immune response intensifies — is not a sign of bacterial infection and does not indicate a need for antibiotics.
Most coughs: coughing is a symptom, not a diagnosis. Most coughs in children follow viral respiratory infections, are self-limiting, and do not benefit from antibiotics. A cough lasting more than three weeks, or accompanied by high fever and fast breathing, warrants medical assessment to exclude pneumonia — but most coughs do not.
Most sore throats: around 80–90% of sore throats in children are viral. Even in clinically confirmed streptococcal tonsillitis, the illness typically resolves without antibiotics in the same timeframe — antibiotics are most useful in reducing the rare complication of rheumatic fever, which occurs predominantly in specific geographic and socioeconomic contexts.
Ear infections: around 80% of childhood ear infections resolve without antibiotics within a few days. UK guidance advises watchful waiting for most ear infections in children over six months, with antibiotics reserved for those who are particularly unwell, under two with bilateral infection, or who are not improving after three days.
Diarrhoea and vomiting: mostly viral (rotavirus, norovirus) and require supportive management with oral rehydration rather than antibiotics.
When Antibiotics Are Genuinely Needed
Antibiotics are appropriate — and important — for: urinary tract infections; confirmed bacterial tonsillitis (positive rapid strep test, or characteristic clinical picture with fever, pus on tonsils, no cough, swollen glands); bacterial pneumonia; pertussis (whooping cough); skin infections (cellulitis, impetigo); and in any child who is seriously ill enough to require hospital assessment.
Key Takeaways
The large majority of common childhood illnesses — colds, most ear infections, coughs, sore throats, and most cases of diarrhoea and vomiting — are caused by viruses, and antibiotics are ineffective against viruses. Antibiotic prescribing for viral illness does not speed recovery, does not prevent secondary bacterial infection in most cases, and does contribute to antimicrobial resistance and disruption of the child's gut microbiome. Knowing when antibiotics are genuinely needed — and having the confidence to accept that a sick child may not need them — is one of the most important things parents can understand about childhood illness management.
