Impetigo, School and Stopping the Spread
The 48-hour rule and where it applies, what to tell the school, and the household measures that actually stop it going round everyone.
Part of the Complete Impetigo Guide.
Key fact: Treatment cuts the contagious period from up to 21 days to 48 hours. That is the whole argument for treating impetigo rather than letting it run — and the reason schools and nurseries ask when treatment started rather than how the rash looks.
The 48-hour rule
| Contagious for | |
|---|---|
| With treatment — hydrogen peroxide cream or antibiotics | 48 hours from starting |
| Without treatment | 7 to 21 days, until the sores have crusted over and healed |
Impetigo will often resolve on its own. The reason not to wait is the three weeks of contagiousness in between, which in a household or a classroom rarely stays contained.
School and nursery
- Stay away until 48 hours after treatment started, or until every sore has crusted and healed if untreated
- Tell the setting — they may need to check other children, and they will usually want to know the date treatment began
- Cover the sores loosely on return where they are in reachable places
- Send in a note of when treatment started, since that is the date the exclusion is counted from
- Siblings do not need to stay off unless they develop it themselves
The exclusion is short by design. It is not a judgement on hygiene, and impetigo in a nursery is close to inevitable at some point regardless of how carefully it is run.
Work
The same 48-hour rule applies, and it matters more in some jobs than others:
- Healthcare, care homes and childcare — tell your employer, because local policy may be stricter and contact with vulnerable people is the concern
- Food handling — lesions on the hands or exposed skin usually need to be covered or the person kept off, and this is an employer policy question rather than a clinical one
- Most other work — 48 hours after treatment starts, with sores covered
Sport and swimming
- Contact sports — rugby, wrestling, judo, martial arts: stay out until the sores have healed, not just 48 hours. Skin-to-skin contact is exactly how it transmits, and clubs frequently have their own rules
- Swimming — generally avoid until healed. The concern is shared surfaces and contact rather than the water itself
- Shared equipment and mats — wipe down, and do not share towels, water bottles or kit
- Gyms — cover the sores, wipe equipment down, and use your own towel
Stopping it spreading at home
Household transmission is the commonest route, and the measures are simple but have to be consistent for the few days it matters.
| Measure | Why |
|---|---|
| Do not touch or scratch the sores | The single most effective thing, and the hardest with a young child |
| Wash hands before and after applying cream | The person applying it is the commonest vector to the rest of the house |
| Own towel and flannel | Shared towels are the classic route between siblings |
| Own bedding, changed daily | While the sores are active |
| Keep nails short | Less damage from scratching, less carried under the nails |
| No sharing | Toys, razors, clothing, bath water, sports kit |
| Treat everyone affected at once | Otherwise it passes back and forth for weeks |
Laundry and cleaning
- Wash towels, bedding and clothing at a high temperature, separately from the rest where practical
- Change them daily while the sores are active
- Wipe down hard surfaces and shared items — door handles, taps, toys, remote controls
- Soft toys that go everywhere with a small child are worth washing hot
- This only needs to be rigorous for a few days, not indefinitely
Keeping a child from touching it
This is the practical problem, and it is worth more than any other measure.
- Cover the sores loosely where they can be reached
- Cut nails short and keep them clean
- Cotton mittens or long sleeves at night for younger children
- Treat the itch — if something underneath is itchy, such as eczema or bites, treating it reduces the scratching that spreads the infection
- Distraction beats instruction with under-fives, and reapplying a covering is less exhausting than repeated telling off
When it keeps coming back
Repeat episodes usually have one of a handful of explanations, and none of them is solved by another tube of cream:
- Staph carried in the nose — harmless there, but it reseeds the skin. This can be treated specifically
- Eczema that is not well controlled, leaving broken skin available
- Scabies or another itchy condition driving the scratching
- Another household member carrying it, often without obvious sores
- Courses stopped early as soon as it looked better
Frequently recurring impetigo is a listed reason for referral, so it is worth raising rather than managing episode by episode.
What to tell the school
- What it is, and that it has been assessed
- The date and time treatment started — the exclusion runs from that, not from when the rash appeared
- Whether the sores are covered, and where they are
- Whether siblings at the same setting are affected
- When you expect to return, so they can plan
Keep the child at home and seek advice, rather than returning at 48 hours, if: the rash is spreading despite treatment; there is fever or the child seems unwell; the area around the sores is becoming red, hot, swollen and painful; or the blisters are large and fluid-filled. A spreading red, hot area can indicate cellulitis and needs urgent assessment.
Frequently Asked Questions
How long should a child stay off school with impetigo?
Until 48 hours after treatment started. If no treatment is being used, they need to stay away until all the sores have crusted over and healed, which can take between 7 and 21 days. Schools usually ask for the date treatment began, because the exclusion is counted from that.
Is impetigo contagious after starting treatment?
It stops being contagious 48 hours after starting hydrogen peroxide cream or antibiotics. Before treatment it can remain contagious for 7 to 21 days, which is the main reason treating it promptly is worthwhile even though it often resolves on its own.
Can you go swimming with impetigo?
Generally not until the sores have healed. The concern is shared surfaces and skin contact rather than the water. The same applies more strictly to contact sports such as rugby, wrestling and martial arts, where skin-to-skin contact is exactly how it transmits.
Do siblings need to stay off school too?
Not unless they develop it themselves. They should have their own towels and bedding, avoid sharing, and be watched for sores appearing, but there is no need to exclude them pre-emptively.
How do I stop impetigo spreading around the house?
Stop the sores being touched, wash hands before and after applying cream, give the affected person their own towel and flannel, change and wash bedding and clothing hot daily while sores are active, keep nails short, and treat everyone affected at the same time so it does not pass back and forth.
References
- National Institute for Health and Care Excellence. Impetigo: antimicrobial prescribing (NG153). nice.org.uk
- NHS. Impetigo. nhs.uk
- National Institute for Health and Care Excellence. Clinical Knowledge Summary: Impetigo. cks.nice.org.uk
- UK Health Security Agency. Health protection in children and young people settings, including education. gov.uk
- NHS. Cellulitis. nhs.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Impetigo is highly contagious, and a spreading rash with fever or a child who is unwell needs assessment rather than a cream. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.