Adenovirus infection in children

Adenoviruses are common viruses that most often cause mild cold symptoms or a flu-like illness. Most children get through this infection just like any other respiratory one. It deserves a page of its own for one reason: adenovirus quite often affects more than the airways alone.

How it differs from an ordinary respiratory infection

The respiratory part itself runs no differently in principle: runny nose, cough, sore throat, temperature. The difference lies in what can join it.

The range of severity is also worth knowing about. Adenoviruses most often produce a mild cold, but their respiratory spectrum is wider: pharyngitis, bronchitis, croup, and in some cases pneumonia. That is not a forecast for your child and not a reason to expect the worst — most children get through the infection easily. It is a reason to be guided by breathing and general condition rather than by the name of the virus: a harsh barking cough with a noisy breath in, wheezing, or rapid or laboured breathing needs examining whatever the causative agent.

Eyes

red eyes, watering, a gritty feeling — conjunctivitis. With adenovirus it occurs noticeably more often than with most other respiratory infections, and frequently appears together with the runny nose rather than separately.

Tummy

adenoviruses can also cause acute gastroenteritis: loose stools, tummy pain, vomiting. Sometimes the gut symptoms run alongside the respiratory ones, which creates the impression of two illnesses at once.

Season

adenovirus infection is possible at any time of year. A summer cold that is 'out of season' is not an anomaly and not a reason to look for another explanation.

How it usually runs

Most often it is a few days of temperature and catarrhal symptoms with gradual improvement. In some children the temperature lasts longer than parents expect, and the eyes turn red after the runny nose has already started to subside. The guide is not the number of days itself but the direction: on the whole, is the child getting better or worse.

Red eyes: what it means and what it does not

Conjunctivitis against the background of a respiratory infection is a frequent situation in a child, and by itself it usually does not mean the illness is running more severely. At the same time, red eyes cannot tell a viral cause from a bacterial one by look, and so do not settle the question of treatment. An examination is needed if there is marked swelling of the eyelids, severe pain in the eye, or worsening vision.

A more severe eye form is described separately for adenoviruses — epidemic keratoconjunctivitis. This is not 'ordinary conjunctivitis, only stronger' but a distinct and highly contagious form behind outbreaks, including in eye clinics: the virus is resistant to some common disinfectants and survives on objects and instruments for hours. The practical takeaway for a family is not to diagnose this in themselves, but that a separate towel, a separate pillowcase and hand washing during this period are not over-caution. And marked eyelid swelling, severe eye pain, light sensitivity or worsening vision are reasons to have the child seen without waiting for it to pass on its own.

Gut symptoms: what to watch

If loose stools or vomiting join the respiratory symptoms, severity is judged not by their number but by whether fluid can be replaced: is the child drinking, keeping it down, passing urine often enough, staying reasonably active. The signs of fluid shortage and the technique of giving fluids are covered on separate pages — they are the same no matter which virus is the cause.

How it spreads

Adenovirus spreads through close contact, by droplets in the air, via objects and surfaces, and also through stool — including during nappy changes. That last route explains why the infection travels easily through families and childcare settings, and why hand washing matters here no less than 'not breathing on each other'.

Diagnosis and treatment

There is no specific antiviral treatment for adenovirus infection: no approved medicine exists against the virus itself. There is no vaccine in general use either — the one that exists is approved only for military personnel and has nothing to do with routine childhood vaccination. Care is supportive: fluids, free nasal breathing, a calm routine, and watching the child's condition.

Adenovirus can only be confirmed in a laboratory — it is not told apart by the clinical picture. In practice this means molecular methods: PCR, usually as part of a multipathogen panel that checks one sample against a dozen respiratory or gut pathogens at once. From this follows something important and not obvious: such a result has a limit of accuracy not in the technique but in the meaning.

For the same reason, an 'everything at once' panel taken on your own initiative before an examination more often adds questions than answers: in an ordinary course of a respiratory infection its result does not change the management. Whether a particular child needs the test and what to do with its result is decided by the doctor at the examination, and this page does not replace those indications.

This page is for general information only and is not a substitute for a consultation with a doctor. A child's diagnosis and treatment are determined by a doctor during an examination.