When Can a Child Return to School After Chickenpox? How Clinics Judge the End of Isolation

The spots arrived on a Tuesday night, three of them, sitting on a warm little belly like mosquito bites that had made a wrong turn. By Thursday there were dozens, and by Friday the parent was standing at the kitchen counter counting them under the lamp, phone in the other hand, wondering how many days of work were about to disappear and whether the class trip next week was gone too.

Chickenpox is one of the few childhood illnesses that comes with a visible progress bar. Each spot moves through the same stages, and the stage it reaches tells you something real about whether the child can pass the virus to someone else. That is why the question of chickenpox return to school has a clearer answer than most school-sickness questions, even if the answer is rarely a fixed number of days.

What follows is how clinicians actually make that call, what the week tends to look like, and where the folklore parts company with the evidence.

How long after chickenpox can a child go back to school?

The short version is that the child goes back when the skin says so. Both the CDC and the NHS use the same anchor point: a child with chickenpox is considered infectious until every blister has dried into a crust. The NHS phrases it as staying off school “until all the spots have formed a scab”, and notes that this is usually about 5 days after the spots first appeared. The CDC’s clinical overview puts the typical window at 5 to 7 days from rash onset for all lesions to crust.

Those two numbers, 5 and 7, are why so much advice online quotes “a week”. A week is a reasonable expectation. It is not a rule. Some children crust by day 4. A child with a heavy crop of spots, or one who is scratching them open, may take closer to 10 days. The date on the calendar is a guess about the skin; the skin itself is the actual evidence.

There is a second, quieter test that clinicians apply alongside crusting: the child should be well enough to take part in the day. A child whose fever has settled, who is drinking, sleeping and eating, and whose spots no longer weep is generally ready. A child who is scabbed over but still flat and feverish is not, and most school health policies would send that child home anyway.

Chickenpox return to school, then, comes down to two questions a parent can answer at home: Is every spot dry? Has the child bounced back? When both are yes, the isolation period has done its job. When either is no, another day or two at home costs little and protects a great deal.

How chickenpox spreads, and why the scabs are the whole story

Chickenpox is caused by varicella-zoster virus, the same virus that later in life can reawaken as shingles. It spreads in two ways. First, through the air: an infected child breathes, coughs or sneezes out virus particles, which can hang in the air of a room and be inhaled by others. Second, through direct contact with the fluid inside the blisters. The CDC describes both routes and notes that the virus is remarkably good at the job. Among people in the same household who have never had chickenpox or the vaccine, roughly 90 percent will catch it from an infected family member.

Here is the part that decides school timing. The virus is present in the fluid of a fresh blister. When that blister dries and a scab forms, the fluid is gone, and with it the infectious risk from that spot. A scab is a lid on an empty jar.

Airborne spread follows a similar arc. It peaks in the day or two before the rash and in the first few days of spots, which is also when fever and coughing are most likely. By the time every spot has crusted, the child is typically past the respiratory shedding phase too.

This explains something that puzzles many parents: the child looks worst on the day they become safe to be around. A face full of brown scabs is alarming to look at and reassuring to a clinician. A child with only six pink, fluid-filled blisters, meanwhile, is still contagious no matter how well they seem. The count does not matter. The stage does.

One more consequence follows from this. Because the virus travels 1 to 2 days before the first spot, a child has usually already exposed classmates by the time anyone knows they are ill. Isolation after the rash is about limiting further exposure, not preventing all of it.

The chickenpox return to school test that clinics use: all crusted, none new

When a school nurse or pediatric clinic decides whether a child can come back, they are checking two things, and both are visible without any equipment.

The first is that every lesion has crusted. Not most. Every one. Clinicians look in the places parents forget: the scalp under the hair, behind the ears, inside the mouth, under the arms, between the buttocks, on the soles of the feet. Spots in the mouth cannot scab in the ordinary way; they form shallow ulcers that heal from the edges. A child with a still-sore mouth is usually still in the active phase.

The second check is that no new spots have appeared for at least 24 hours. Chickenpox comes in waves, or “crops”, over several days, so a child who is fully scabbed on the trunk may still be sprouting fresh blisters on the legs. A quiet 24 hours confirms the last crop has arrived.

Several practical habits make this easier at home:

• Do a full-body check in good light once a day, at bath time, and note anything new.
• Look for the difference between a blister (raised, pink, with a clear or cloudy dome) and a scab (flat or slightly raised, dry, brown or dark red).
• Treat any spot you are unsure about as not yet crusted.

Clinicians also apply the “well enough” filter. A child with a settled temperature, normal appetite and enough energy for a school day passes. A child who is still lethargic is asked to wait, scabs or not.

For most children the two tests line up on the same morning somewhere between day 5 and day 7 after the first spot, matching the CDC’s typical range. If your child’s school has a written exclusion policy, it will almost always echo this same standard, sometimes with a request for a note. That note describes the skin; it does not override it.

Is chickenpox still contagious after 7 days?

It can be, and this is exactly why day counting is unreliable. The 7-day figure is the upper end of the CDC’s typical crusting window, not a switch that flips. A child whose last crop of blisters emerged on day 5 may still have fresh, fluid-filled spots on day 7, and those spots carry virus.

Three situations commonly push contagiousness past a week:

• A heavy rash. Children who develop several hundred spots, which does happen, take longer for the last of them to dry.
• Late crops. New blisters can keep appearing for 4 to 5 days after the first, so a slow-starting child may still be producing spots when the calendar says a week has passed.
• Broken scabs. Scratching lifts crusts and exposes the moist base underneath. That base can be slower to seal than an undisturbed spot.

The reverse is also true. Many children, especially those with a light rash, are fully crusted by day 4 or 5, and holding them at home until an arbitrary day 7 protects nobody.

What matters after 7 days is the same as before: look at the skin. If every spot is a dry scab and none are new, the child is no longer considered infectious by the standards the CDC and NHS use. If there is still any blister with a dome of fluid, treat the child as contagious for another day and check again.

Scabs themselves are safe. Once dry, they do not shed virus, even when they fall off, even when there are still dozens of them. A child with a scabbed face at school is not a risk to classmates, though they may need some kindness about how it looks.

If you are unsure whether a particular spot has crusted, the low-risk choice is one more day at home and a call to the clinic for a quick look.

What the chickenpox week usually looks like, day by day

Chickenpox has a rhythm that repeats across most children, even though the exact timing varies. The Mayo Clinic describes the illness as running about 5 to 10 days from the first spot, with the rash moving through three stages: raised bumps, then fluid-filled blisters, then crusts. The table below sets out the typical pattern and what it means for contagiousness. Every figure is a typical range, not a guarantee for your child.

Phase	Typical timing	What you usually see	Contagious?
Before the rash	1–2 days before first spot	Tiredness, mild fever, poor appetite, sometimes headache	Yes, already spreading
First crop	Day 1–2	Small pink bumps, often chest, back, face; fever may climb	Yes
Blister stage	Day 2–5	Bumps become clear then cloudy blisters; new crops arrive; itch peaks	Yes, highest
Crusting	Day 4–7	Blisters dry to brown scabs; no new spots; fever settles	No, once all are crusted
Healing	Day 7–14 and beyond	Scabs fall off; pink marks fade over weeks	No

A few points make the table easier to use. The fever, when it occurs, tends to sit in the first two or three days and lifts as crusting begins. The itch often lags behind the spots by a day and can be the most disruptive symptom for sleep. And the phases overlap: a child in day 4 may have scabs on the chest, cloudy blisters on the arms and brand-new bumps on the thighs all at once.

The pink or pale marks left after scabs fall are not scars in most cases. They fade over weeks to a few months. Scarring is more likely where spots were scratched open or became infected, which is one practical reason to keep nails short and the itch managed.

Is day 3 of chickenpox the worst?

For many families, yes, but not for the reason people assume. There is no biological event scheduled for day 3. What tends to happen is that several unpleasant things overlap around then: the fever is often at or near its peak, the first crop of spots has ripened into itchy blisters, and a second or third crop is still arriving. A child who was merely off-color on day 1 is now uncomfortable, sleepless and cross, and the parents are on their third night of broken sleep.

The evidence supports the overlap rather than a fixed worst day. The CDC notes that fever and the early symptoms typically begin a day or two before the rash and that new lesions appear over several days. The itch, described by the Mayo Clinic as the hallmark of the blister stage, is worst while blisters are fresh and eases as they crust. Put those curves together and the trough for most children falls somewhere between days 2 and 4.

Some children never have a bad day. Those with a light rash, and many who have been vaccinated, may have a handful of spots, no fever, and barely notice. Others hit their low point later, on day 4 or 5, if their crops arrive slowly.

What day 3 is not is a turning point that means the child is nearly done. New spots can still appear for another day or two after the worst night. Parents sometimes relax their checks once the child seems brighter, then find fresh blisters on the legs that push the return date back.

If the worst day feels worse than the ordinary misery of chickenpox, meaning the child is drowsy rather than tired, breathing fast, or refusing all fluids, that is a reason to call, not to wait for day 4. Ordinary chickenpox is uncomfortable. It should not be frightening.

Who usually goes back sooner, and who is asked to wait longer

The crusting rule works for the majority of children, but clinicians adjust it at both ends.

Vaccinated children who still catch chickenpox, a situation called breakthrough varicella, often have a much milder picture: fewer than 50 spots, little or no fever, and lesions that look more like small red bumps than classic blisters. The CDC notes that many of these spots never form true blisters and therefore never crust. For these children the CDC’s guidance is to wait until no new lesions have appeared for 24 hours, since the crusting test cannot be applied. In practice, that often means a shorter absence. Two doses of chickenpox vaccine are more than 90 percent effective at preventing the illness altogether, according to the CDC, so a vaccinated child with spots deserves a clinician’s look to confirm the diagnosis.

At the other end, several groups are typically asked to stay home longer or have their return timed by the treating team:

• Children with weakened immune systems, whether from a medical condition or a treatment, who can have more spots, slower crusting and a higher risk of complications.
• Children who developed a complication such as a bacterial skin infection or pneumonia, whose return depends on recovery from that problem rather than the rash.
• Children who remain feverish or unwell after the spots have crusted.

There is also the question of who else is in the building. Schools and nurseries with pregnant staff, or with pupils known to be immunocompromised, may ask for stricter confirmation before a child returns. That is not an overreaction. Chickenpox in pregnancy or in a child on chemotherapy can be serious, and the CDC lists both among the groups at highest risk.

The decision about an early or delayed return sits with the treating clinician and the school’s health policy, informed by the child’s skin, the child’s overall recovery, and who they will be sitting next to.

Chickenpox scabs at school: does a scabbed child still need to stay home?

No. Dry scabs are not infectious, and a child who is otherwise recovered does not need to hide at home until they fall off. Scabs can take a week or two to separate on their own, and the CDC’s exclusion standard is explicit that it ends at crusting, not at clear skin.

The practical problem is rarely medical. It is that children, particularly older ones, feel exposed. A pre-teen with thirty brown crusts across the forehead may genuinely dread the classroom. Several small things help:

• Explain, in their words, that scabs are the “done” sign and that everyone in the class has seen or had chickenpox.
• Let them choose comfortable clothing that covers what they want covered without overheating.
• Ask the teacher, quietly, to head off comments before they start.
• Do not pick scabs to speed things up. Picking increases the chance of a mark that lasts.

There is one situation where a scab does become a medical question. If a scab or the skin around it turns red and swollen, feels hot, oozes yellow fluid, or becomes painful rather than itchy, it may have become infected with bacteria. Bacterial skin infection is the most common complication of chickenpox in children according to the CDC, and it is treated separately from the virus. A child with a suspected infected spot should be seen before returning, both for their own sake and because that infection can spread by contact.

Scabs that fall off early because of scratching can leave a shallow open area. Keep it clean, cover it if it is somewhere that rubs, and let it dry out. It does not restart the contagious clock; the virus was gone once the blister dried.

The marks left behind fade. Most pink or pale patches are gone within a few months, and true pitted scars are uncommon in spots that were left alone.

Can a parent of a child with chickenpox go to work?

Usually yes, with two conditions.

The first is that the parent is immune. Almost every adult who grew up before routine vaccination had chickenpox as a child, whether they remember it or not, and lifelong immunity after infection is the norm. Adults who received two doses of vaccine are also protected in the great majority of cases. An immune parent cannot carry the virus to the office on their clothes in any meaningful way; the CDC describes spread as airborne from an infected person or by contact with blister fluid, not by a healthy third party acting as a courier.

The second condition is that the parent is not, in fact, becoming the next case. A parent who has never had chickenpox or the vaccine is in the window of risk from the moment their child became infectious, which is 1 to 2 days before the first spot. Incubation is 10 to 21 days according to the CDC, so a non-immune parent should watch for fever or spots across that whole stretch and stay away from work if either appears. Adults tend to have more severe chickenpox than children, with a higher rate of pneumonia, so a non-immune adult who has been exposed is worth a call to their own clinician promptly; there are options that are most useful in the first few days after exposure, and the decision belongs to that clinician.

Where the parent works matters too. Anyone whose job puts them alongside pregnant colleagues, newborns, or people with weakened immunity, and who is not certain of their own immunity, should speak to their employer’s occupational health team before going in.

Someone still has to stay home with the child, of course. Who that is has nothing to do with contagion and everything to do with logistics. If you are unsure whether you ever had chickenpox, a blood test can check for antibodies; your clinician can arrange it.

Siblings, nursery and the 21-day window: how long is chickenpox contagious for the rest of the house?

The first child’s return to school is only half the planning problem. The rest of the household now sits inside an incubation window.

Any sibling who has never had chickenpox or the vaccine has, statistically, very likely caught it. The CDC’s figure of roughly 90 percent transmission among susceptible household contacts is one of the highest for any common infection. Their spots, if they come, will typically appear 10 to 21 days after they were first exposed, most often around 14 to 16 days. Because the first child was infectious for a day or two before their own rash, the sibling’s clock started earlier than the parent noticed.

Exposed siblings can generally attend school while they are well; most policies do not exclude contacts, only cases. Two caveats apply. First, the sibling becomes infectious 1 to 2 days before their own first spot, so a child who develops a fever or seems off during the window should be kept home and watched. Second, schools and nurseries appreciate being told there is chickenpox in the family, because it lets them warn pregnant staff and the parents of vulnerable children.

Babies deserve a specific word. Infants under a year are too young for the vaccine and can have more severe chickenpox, and newborns whose mothers are not immune are at particular risk. If there is a baby in the house, or a pregnant person, tell your clinician the day the first child is diagnosed. There are time-sensitive options for high-risk contacts, and the decision about whether they apply rests with the clinical team.

A vaccinated sibling has a good chance of avoiding illness altogether, and if they do catch it the picture is usually mild. Even so, watch the same window. Breakthrough cases can still spread the virus, though the CDC notes they are generally less contagious than unvaccinated cases.

Comfort at home while you wait for the crusts

Nothing a parent does at home speeds the virus, but plenty can make the week bearable and reduce the chance of a spot becoming infected. The NHS, Mayo Clinic and Cleveland Clinic offer overlapping advice, and the themes are consistent.

For the itch, cool matters more than anything. Lukewarm rather than hot baths, sometimes with colloidal oatmeal or baking soda added, soothe many children. Loose cotton clothing, a cool room and a cool damp cloth on the worst patches all help. Calamine lotion or similar cooling gels on the spots are widely suggested. Antihistamines by mouth are sometimes used for itch and sleep; whether one is appropriate for a particular child, and which, is a question for the pharmacist or clinician, not the internet.

For fever and discomfort, the general guidance is that acetaminophen (paracetamol) may be used if the child is uncomfortable. Two cautions come up repeatedly in the mainstream sources. Aspirin and products containing it should not be given to children with chickenpox because of the link to Reye’s syndrome, a rare but serious condition affecting the liver and brain. The NHS also advises against ibuprofen in chickenpox unless a clinician has recommended it, because of a possible association with severe skin infections. Ask before giving anything, and follow the label or the prescriber.

For fluids, offer often and offer cold. Mouth spots make eating painful; ice pops, smoothies and soft, bland food go down more easily than crisps or citrus.

For the skin, keep nails short and clean, consider soft mittens or socks on the hands of a young child overnight, and pat rather than rub after bathing. Scratching is the main route to infected spots and to lasting marks.

Rest as the child wants it. Some are flattened; others are bouncing off the walls by day 4. Neither is wrong.

How clinicians decide whether antiviral medicine is needed

Most healthy children with chickenpox are not prescribed antiviral medicine, and that is a deliberate choice, not a gap in care. The illness is self-limiting in the great majority of otherwise well children, and the CDC’s clinical guidance reserves antivirals mainly for people at higher risk of severe disease.

The medicines used belong to a class of antivirals that block the enzyme the varicella-zoster virus needs to copy its genetic material. Acyclovir is the best-known example. Because they work by stopping replication, they help most when the virus is still multiplying fast, which is early. The CDC notes that oral antiviral treatment has its greatest effect when started within 24 hours of the rash appearing. Started later in a healthy child, the benefit is modest at best, which is another reason it is not routine.

Groups in whom a clinician is more likely to consider treatment include:

• Adolescents and adults, who tend to have more severe illness.
• People with chronic skin or lung conditions.
• Those on long-term steroid or other immune-suppressing treatment.
• Anyone with a weakened immune system, in whom intravenous treatment in hospital may be used.
• Sometimes a second household case, since later cases in a family are often more severe than the first.

Whether antiviral treatment shortens the contagious period in a way that changes school timing is not something parents should count on. The crusting rule still applies; the medicine, where used, is about reducing severity and complications in the person taking it.

For exposed contacts who are at high risk, such as pregnant people or immunocompromised children, there are separate post-exposure options, including vaccination within a few days of exposure for those eligible and an antibody preparation for those who cannot be vaccinated. All of this is for the treating clinician to judge. What a parent can do is call early: the useful windows are measured in days, and sometimes hours.

What people often get wrong about chickenpox and school

Some beliefs about chickenpox are so widespread they feel like knowledge. Several of them steer families toward the wrong decision.

“It’s seven days, then back.” Seven days is the upper end of a typical range, not a rule. A child crusted by day 4 can go back; a child with fresh blisters on day 8 cannot.

“Scabs mean they’re still contagious.” The opposite. Scabs are the end point that clinicians wait for. Only fluid-filled blisters shed virus by contact.

“Fewer spots means less contagious, so a light case can go in.” Six blisters shed virus as surely as sixty. Stage, not count, decides. The exception is vaccinated children whose bumps never blister, where the 24-hour no-new-spots test replaces crusting.

“Catching it young is a good idea, so a chickenpox party is fine.” The CDC is unambiguous that deliberate exposure is not recommended. Chickenpox is usually mild but not always; it puts otherwise healthy children in hospital every year with skin infections, pneumonia and, rarely, brain inflammation. Vaccination gives immunity without those risks.

“Once you’ve had it, you’re done with the virus.” Immunity to a second bout of chickenpox is very strong, but the virus stays dormant in nerve cells and can reactivate decades later as shingles.

“You can catch chickenpox from someone with shingles.” True, though often misunderstood. Contact with the fluid from shingles blisters can give chickenpox to a person who is not immune; it does not give them shingles.

“An adult who never had it can safely nurse the child.” Adults get more severe chickenpox than children, and a non-immune adult caring for a case has a very high chance of catching it. That adult needs to talk to their own clinician early.

“A fever after the scabs means it’s coming back.” Chickenpox does not relapse. A new fever after crusting more often signals a bacterial infection of a spot or another illness, and it is worth a call.

Questions to ask your care team

A chickenpox appointment, if one happens at all, is often a quick phone call or a nurse triage line. A short list in hand makes those minutes count. Adapt these to your family’s situation.

• Based on my child’s rash today, when would you expect the spots to be fully crusted, and what should I look for to confirm it?
• My child is vaccinated and the spots do not look like blisters. What test should I use for return to school instead of crusting?
• Is there anyone in our household, school or wider family you would want told about this exposure: someone pregnant, a newborn, or someone on treatment that lowers immunity?
• I am not sure I ever had chickenpox myself. Should I be tested for immunity, and is there anything time-sensitive I should know about as an exposed adult?
• Which fever and itch products are appropriate for my child, and which should we avoid? Is there anything about ibuprofen or aspirin we need to know?
• What would make you want to see my child in person rather than manage this by phone?
• Are there any features of my child’s history that would make you consider antiviral treatment, and how quickly would that need to start?
• My child’s sibling has not had chickenpox or the vaccine. Should they keep going to school during the incubation window, and what should we watch for?
• The school is asking for a note. What exactly should it say about the return date?
• After this, when would my child be due for chickenpox vaccination, or does having had the illness change the schedule?

Write down the answers, especially any dates the clinician mentions and any symptom that would prompt an urgent call. Chickenpox nights are long and memory is short; a note on the fridge is worth more than good intentions.

If the answers change your plans, that is the system working. The clinician can see the whole picture, including things you may not know matter, and the final decision about school, medicine and monitoring rests with them.

When to call your doctor

Uncomplicated chickenpox is miserable but safe to manage at home. Complications are uncommon, and most announce themselves with signs that are different in kind from ordinary chickenpox discomfort. The CDC lists bacterial skin infection, pneumonia, dehydration and inflammation of the brain among the complications that do occur, and the following signs should prompt a same-day call to your clinician or urgent care service.

• Skin around a spot that becomes red, hot, swollen or increasingly painful, or that oozes pus. This suggests a bacterial infection and needs assessment.
• Difficulty breathing, fast breathing, or a persistent cough with the illness. Chest complications are more common in adults and infants but can affect any age.
• A stiff neck, severe headache, unusual drowsiness, confusion, difficulty walking or a seizure. These can signal involvement of the brain and are emergencies.
• Signs of dehydration: very few wet nappies or trips to the toilet, dry mouth, no tears when crying, sunken eyes, or refusing all fluids.
• A high fever that lasts beyond about 4 days, or a fever that goes away and then returns after the spots have crusted.
• Spots that spread into the eye itself, causing redness and pain, or a rash that bleeds or looks bruised.
• Any chickenpox in a baby under a month old, in a child with a weakened immune system, or in a pregnant person.

Call sooner rather than later if something feels wrong even without a listed sign. A parent’s sense that a child is “not right” is a legitimate reason to seek advice. When phoning, say the word chickenpox at the start; many practices will arrange a separate entrance or a video assessment to protect other patients, including pregnant people in the waiting room.

For a child who is breathing with difficulty, cannot be woken, or has a seizure, call emergency services rather than the clinic. Everything else in this article is background. This section is the one to keep.

Frequently asked questions

How long after chickenpox can you go back to school?

Once every spot has crusted over and no new spots have appeared for a full day, which is typically 5 to 7 days after the rash started according to the CDC and NHS. The child should also be free of fever and well enough for a full day. Some children crust sooner, some with heavy rashes take longer, so check the skin rather than counting days.

Is chickenpox still contagious after 7 days?

It can be if any blister still contains fluid or new spots are still appearing, because the 7-day figure is the top of a typical range rather than a cut-off. Children with a heavy rash, late crops of spots, or scratched-open blisters may remain infectious beyond a week. If every spot is a dry scab and nothing new has appeared for 24 hours, the child is no longer considered contagious.

Is day 3 of chickenpox the worst?

Often, yes, because fever tends to peak while the first crop of spots turns into itchy blisters and new crops are still arriving, but there is no fixed worst day. Some children barely notice the illness; others feel worst on day 4 or 5. A child who becomes drowsy rather than tired, breathes fast, or refuses fluids on any day should be assessed rather than waited out.

Can a parent of a child with chickenpox go to work?

Usually yes, provided the parent is immune from past infection or two vaccine doses and is not developing chickenpox themselves. An immune adult does not carry the virus to others. A parent who has never had chickenpox or the vaccine is at high risk of catching it, tends to have more severe illness than a child, and should contact their own clinician promptly and stay home if fever or spots appear.

What is the chickenpox isolation period for a vaccinated child?

Vaccinated children who still catch chickenpox often develop small bumps that never blister or crust, so the usual scabbing test does not apply. The CDC advises that these children stay home until no new lesions have appeared for 24 hours and they feel well. Because breakthrough cases can look unlike classic chickenpox, a clinician should confirm the diagnosis before you plan around it.

Can my child go to school with chickenpox scabs?

Yes. Dry scabs are the sign clinicians wait for and are not infectious, even if there are many and even when they fall off. Scabs can take a week or two to separate and do not need to be gone before return. If any scab becomes red, hot, swollen or oozes pus, have it checked first, because that may indicate a bacterial infection that is treated separately.

How long is chickenpox contagious before the spots appear?

About 1 to 2 days before the first spot, according to the CDC. During this window the child may have a mild fever, tiredness or poor appetite, or may seem entirely well, and is already able to spread the virus through the air. This is why classmates are usually exposed before anyone knows, and why exposed siblings should be watched through the whole 10 to 21 day incubation window.

Should an exposed sibling stay home from school?

Generally no, as long as the sibling is well; most school policies exclude cases rather than contacts. Watch closely for 10 to 21 days after exposure, keep the sibling home if fever or spots begin, and tell the school there is chickenpox in the household so staff can alert pregnant colleagues and families of vulnerable children. Ask your clinician about vaccination if the sibling has not had it.

Does antiviral medicine mean my child can return to school sooner?

Not reliably. Antiviral medicines block the virus from copying itself and are prescribed mainly to reduce severity and complications in higher-risk people, with the greatest effect when started within 24 hours of the rash. The return-to-school test remains the same: all spots crusted and no new ones for a day. Whether treatment is appropriate is a decision for the prescribing clinician.

What are the signs chickenpox has become serious?

Red, hot, swollen or pus-filled skin around a spot; fast or difficult breathing; severe headache, stiff neck, unusual drowsiness, confusion or a seizure; signs of dehydration such as very little urine or refusing fluids; fever lasting beyond about 4 days or returning after crusting; and any chickenpox in a newborn, a pregnant person, or someone with a weakened immune system. Each warrants a same-day call, and breathing difficulty or a seizure warrants emergency services.

References

• CDC: Clinical Overview of Chickenpox (Varicella)
• CDC: About Chickenpox
• NHS: Chickenpox
• MedlinePlus: Chickenpox

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.