Hand, foot and mouth disease, herpangina, and pool fever each present differently — and each has different return-to-daycare guidelines. Check for fever pattern, rash location, and eye symptoms.
Every summer, families with children in hoikuen (licensed nursery schools) or yochien (kindergartens) across Japan start receiving notices: “A case of hand, foot and mouth disease has been confirmed.” “We’re seeing more children with herpangina.” “Please be aware of pool fever in the community.”
You may have heard these names before, but when your child actually develops a fever, starts refusing food because of mouth pain, or breaks out in blisters on their hands and feet, it can be hard to know what you’re dealing with — or when it’s safe for them to go back.
Children aged 0 to 3 often cannot explain where it hurts or how they are feeling, which makes it harder for both parents and nursery staff to assess the situation. Add to that the reality of limited days off work, or the knowledge that the illness is spreading through the nursery or kindergarten, and the anxiety compounds quickly: Am I pushing my child too hard? Could they pass it on to others?
This article covers the key differences between hand, foot and mouth disease (HFMD), herpangina, and pool fever — and outlines when children can return to hoikuen or yochien — based on official Japanese public health guidance, updated for summer 2026.
Diagnosing a specific illness is the job of a physician. But when families and childcare staff share the same baseline information, it becomes much easier to explain symptoms at the clinic, communicate clearly with the nursery or kindergarten, and feel confident about the timing of return.
As editor of TamagoDaruma, I believe the most important thing in an article like this isn’t to alarm — it’s to help you organize your next steps. This isn’t about assigning blame to parents or dismissing the concerns of nursery staff. It’s about putting the child’s wellbeing at the center, and giving families, childcare providers, and healthcare professionals the same clear reference point.
Table of Contents
Three key things to look for across HFMD, herpangina, and pool fever
While the three conditions share some symptoms, looking at fever pattern, rash location, and whether eye symptoms are present can help you organize what you’re observing.
Hand, foot and mouth disease (HFMD), herpangina, and pharyngoconjunctival fever (PCF) — commonly called pool fever in Japan — are all well-known summer childhood illnesses. Because they share certain symptoms — fever, sore throat, and sores in the mouth — it can be genuinely difficult to tell them apart at home.
That said, you can still prepare before a clinic visit. HFMD is characterized by blistering rashes on the hands, feet, and inside the mouth. Herpangina tends to present with a sudden, high fever and sores at the back of the throat. Pool fever — the colloquial Japanese name for pharyngoconjunctival fever — typically combines fever, sore throat, and conjunctivitis: red, irritated eyes with discharge.
This comparison isn’t intended to help you diagnose at home. It’s a tool for organizing what you’re observing before a clinic visit, and for communicating clearly with your child’s nursery or kindergarten.
Symptom comparison at a glance
The table below compares the main characteristics of HFMD, herpangina, and pool fever (pharyngoconjunctival fever).
| Feature | Hand, Foot & Mouth Disease (HFMD) | Herpangina | Pool Fever (Pharyngoconjunctival Fever / PCF) |
|---|---|---|---|
| Main cause | Coxsackievirus A, Enterovirus 71, and related enteroviruses | Coxsackievirus A and related enteroviruses | Adenovirus |
| Fever | Fever is not always present; high or prolonged fever is generally uncommon | Sudden onset of fever is commonly seen | Fever may persist for several days |
| Mouth / throat symptoms | Blisters or mouth ulcers inside the mouth may appear | Blisters or ulcers at the back of the throat may appear | Sore throat and pharyngitis are commonly seen |
| Hand / foot rash | Blister-like rashes may appear on the palms, soles of the feet, and the tops of the feet | Hand and foot rashes are not typically prominent | Hand and foot rashes are not typically prominent |
| Eye symptoms | Not a primary feature | Not a primary feature | Red eyes, discharge, and conjunctivitis may be present |
| Transmission routes | Droplet transmission, contact transmission, fecal-oral transmission | Droplet transmission, contact transmission, fecal-oral and oral transmission | Droplet transmission, contact transmission. Shared towels and hand contact also require attention. |
| Incubation period (approximate) | 3–5 days | 2–4 days | Approximately 5–7 days |
| Return-to-daycare policy | No statutory exclusion period; return is assessed based on overall condition and facility policy | No statutory exclusion period; return is assessed based on overall condition and facility policy | Exclusion period criteria are defined under Japan’s School Health and Safety Act Enforcement Regulations |
With HFMD, the distribution of symptoms across the hands, feet, and mouth is the main distinguishing feature. Herpangina, by contrast, tends to involve more prominent sores and pain deep in the throat, without the hand and foot rashes. Pool fever (PCF) stands out through its combination of fever and sore throat with noticeable eye redness and discharge.
That said, symptoms vary considerably from child to child. HFMD, for instance, doesn’t always present with the classic rash distribution — and making a judgment based on appearance alone can be misleading. If you’re uncertain, please consult a healthcare provider.
（参照：Hand, Foot and Mouth Disease | Ministry of Health, Labour and Welfare (MHLW)）
（参照：Herpangina | Ministry of Health, Labour and Welfare (MHLW)）
（参照：Pharyngoconjunctival Fever | Ministry of Health, Labour and Welfare (MHLW)）
Wondering if it might be HFMD? What to check first
If HFMD is a possibility, start by checking the inside of the mouth, the palms of the hands, and the soles and tops of the feet for blister-like rashes.
According to Japan’s Ministry of Health, Labour and Welfare (MHLW), HFMD typically causes blister-like rashes on the inside of the mouth, the palms, and the soles and tops of the feet, appearing 3 to 5 days after infection. Fever occurs in approximately one-third of cases and tends to be mild — high or prolonged fever is not the norm.
On the other hand, if your child has blisters or ulcers only inside the mouth with no rash on the hands or feet, the illness may be herpangina or another condition. If there is noticeable redness and discharge in the eyes combined with fever and a sore throat, pharyngoconjunctival fever (pool fever) is worth considering.
What you can do at home is observe and document — not diagnose. When you visit the clinic, try to be ready to describe: when the fever started, where any rash appeared, whether your child is eating and drinking normally, and whether there is any redness in the eyes. This information will help the appointment go more smoothly.
（参照：Hand, Foot and Mouth Disease | Ministry of Health, Labour and Welfare (MHLW)）
What’s the situation in summer 2026? Some regions are seeing earlier-than-usual activity
In 2026, Kagoshima Prefecture issued an HFMD epidemic alert in May. However, this does not mean the outbreak is occurring uniformly across Japan ahead of schedule.
The regional HFMD activity drawing attention in summer 2026 is centered on Kagoshima Prefecture, in southern Kyushu. During Week 20 of 2026 (May 11–17), Kagoshima’s infectious disease surveillance data recorded a per-sentinel-site case count of 6.13 for HFMD — exceeding the epidemic alert threshold of 5.00 — and the prefecture issued a prefectural epidemic alert on May 21, 2026.
According to Kagoshima Prefecture’s published figures, the prefecture-wide per-sentinel-site count had reached 11.32 by Week 22 (May 25–31).
This is factual information worth being aware of. However, reading it as confirmation that “the 2026 season is running ahead of schedule nationwide” would be premature. Infectious disease outbreaks vary significantly by region, year, and the specific circumstances of group childcare settings.
At TamagoDaruma, we’re cautious about the way phrases like “earlier this year” or “numbers are surging” can take on a life of their own. What parents actually need isn’t heightened anxiety from national-level headlines — it’s the ability to check what’s happening in their own area and at their own nursery or kindergarten.
（参照：Epidemic Alert for Hand, Foot and Mouth Disease | Kagoshima Prefecture）
Checking the latest data through JIHS surveillance reports
Up-to-date national infectious disease data in Japan is published weekly by the Japan Institute for Health Security (JIHS) through its Infectious Disease Surveillance Weekly Report. Because outbreak patterns shift from week to week, it’s worth checking the latest figures after this article was published.
For herpangina, Japan typically sees case numbers begin rising around May, peaking around July, then declining through August. HFMD similarly follows a summer-focused seasonal pattern in Japan, with the peak typically occurring in late July.
In other words, increased vigilance from May through summer is not unusual — it is the expected seasonal pattern. The key is to distinguish between “the normal seasonal trend” and “what is actually happening in your region this year.”
（参照：Infectious Disease Surveillance Weekly Report | Japan Institute for Health Security (JIHS)）
（参照：Hand, Foot and Mouth Disease | Ministry of Health, Labour and Welfare (MHLW)）（参照：Herpangina | Ministry of Health, Labour and Welfare (MHLW)）
How to check outbreak levels by region
In day-to-day terms, the most relevant information isn’t the national overview — it’s the weekly data published by your own prefecture, local public health center (hokenjo), or regional infectious disease information center. These sources are much closer to what’s actually happening in nurseries and kindergartens near you.
To find prefectural data, try searching in Japanese using your area name combined with the disease name — for example, “東京都 感染症情報,” “大阪府 手足口病 警報,” or “鹿児島県 手足口病.” If you live in an area where an epidemic alert has been issued, basic preventive measures at your child’s nursery or kindergarten — thorough handwashing, avoiding shared towels, and careful handwashing after diaper changes — become especially important. But even in areas without an active alert, establishing consistent hygiene habits before summer peaks is a sound approach.
When can my child go back to daycare? Guidelines by illness
The decision to return to hoikuen or yochien should not be based on diagnosis name alone. Check fever, eating, fluid intake, energy level, and your nursery or kindergarten’s own policies.
This is the question most commonly associated with this article: “When can my child go back?” As a parent, your child’s health comes first — but schedules and work commitments are real, and knowing when return is genuinely appropriate takes some of that weight off.
The important thing here is not to carry this decision alone. Parents can observe how their child is doing at home. The nursery or kindergarten has its own standards for a group care environment. The physician has a medical perspective. Bringing all three together is what makes the timing clearer.
Of the three conditions covered here, pharyngoconjunctival fever (pool fever) has a defined statutory exclusion period under Japan’s School Health and Safety Act Enforcement Regulations. HFMD and herpangina, by contrast, do not carry a statutory exclusion period in the same sense — the judgment rests on symptom recovery and the policies of the individual nursery or kindergarten.
HFMD and herpangina: when children can return to daycare
For HFMD and herpangina, Japan’s MHLW Infectious Disease Control Guidelines for Nursery Schools state that the benchmark for going back is “when the effects of fever and oral blisters or ulcers have resolved, and the child can eat normally.”
This means it is not enough to check only whether the fever has come down. You also need to assess whether mouth or throat pain has eased enough that the child can eat and drink at close to their normal level.
If a rash is still visible but fever and oral symptoms have resolved and the child can eat normally, that can serve as a guideline for considering a return to daycare. In all cases, the final decision should be confirmed with the nursery or kindergarten’s own policies and any guidance provided by the child’s physician.
The urge to send a child back the day after their temperature drops is completely understandable. But if they’re still in pain from mouth sores and can’t eat properly, it’s hard on the child — and it puts nursery staff in a difficult position too. The real question is not just “what illness is this?” but “is my child well enough to get through a normal day at nursery or kindergarten?”
（参照：Infectious Disease Control Guidelines for Nursery Schools (2018 Revised Edition) | Ministry of Health, Labour and Welfare (MHLW)）
Pool fever (pharyngoconjunctival fever): a statutory exclusion period applies
Pool fever — formally known as pharyngoconjunctival fever (PCF) — is handled differently from HFMD and herpangina under Japan’s regulatory framework.
PCF is classified as a Category II infectious disease under Japan’s School Health and Safety Act Enforcement Regulations. The statutory exclusion period is defined as “until two days have elapsed after the main symptoms have resolved.”
The main symptoms referred to here include fever, throat symptoms, and eye symptoms. The fact that a child’s temperature has returned to normal does not necessarily mean symptoms have “resolved” if eye redness, discharge, or throat pain remain.
It’s worth noting that under Japan’s School Health and Safety Act, “schools” includes yochien (kindergartens). Hoikuen (licensed nursery schools and daycare centers) are administered under separate legislation as childcare welfare facilities — but the MHLW’s Infectious Disease Control Guidelines for Nursery Schools explicitly reference the School Health and Safety Act as applicable guidance for hoikuen as well. In practice, hoikuen typically follow the same infection control standards.
If your child is diagnosed with PCF, listen carefully to the physician’s explanation, then contact your hoikuen or yochien directly to confirm their specific return criteria and any documentation they require.
（参照：School Infectious Diseases and Exclusion Period Standards | Japan Pediatric Society）
（参照：Infectious Disease Control Guidelines for Nursery Schools (2018 Revised Edition) | Ministry of Health, Labour and Welfare (MHLW)）
Decision checklist: 5 things to confirm before going back
On the evening before or the morning of the planned return, work through the checklist below. This is a framework for organizing your own assessment at home. If your physician or the nursery or kindergarten has given you specific instructions, follow those first.
Pre-return self-check
- Has the fever resolved and remained stable through the previous evening and into this morning?
- Have mouth blisters or throat pain eased enough that the child can eat and drink close to normally?
- Has the child’s mood and energy level recovered enough to manage a full day in a group care setting?
- For pool fever (PCF): has it been at least two days since all major symptoms — fever, throat, and eyes — resolved?
- Have you confirmed whether the nursery or kindergarten requires a return notification form, a physician’s advisory statement, or a doctor’s clearance note?
The most important point in this checklist is not to reduce the decision to “has the fever gone?” Is the child drinking enough? Can they eat? Did they sleep well? Do they have the energy to play at nursery? These factors matter just as much as temperature when deciding whether it’s time to go back.
Is a physician’s clearance note required?
The handling of return documentation — including return notification forms, physician’s advisory statements, and doctor’s clearance notes — varies by municipality and childcare provider. This article cannot make a blanket statement that such documents are always required or always unnecessary.
Under the MHLW’s Infectious Disease Control Guidelines for Nursery Schools, HFMD and herpangina are placed in a different category from illnesses that require a formal physician’s advisory statement. However, individual hoikuen and yochien may still require their own return notification or physician sign-off before readmission.
For pool fever (PCF), some nurseries and kindergartens — depending on the municipality — may request a doctor’s clearance note before a child can re-enter.
When your child receives a diagnosis, ask the physician directly: “When is it appropriate to return to the nursery or kindergarten?” and “If documentation is required, how should we obtain it?” Then contact the nursery or kindergarten as soon as you’re home to confirm their specific requirements.
What to tell your child’s nursery or kindergarten — and what to ask them
When you call or message the nursery or kindergarten, keep it concise: share the diagnosis or suspected illness, the date of onset, current symptoms, what the physician said, and ask about when your child can return.
When a child is diagnosed with an infectious illness, one thing parents are often unsure about is how to communicate with the nursery or kindergarten. Is it okay to call before a formal diagnosis? Should you call again once the illness is confirmed? Is it appropriate to ask about returning? The morning rush moves quickly, and these questions can pile up before you’ve had a chance to think them through.
You don’t need to wait for a confirmed diagnosis before contacting the nursery or kindergarten. What they need isn’t a perfect clinical label — it’s a picture of when the symptoms started, what the child is experiencing, whether a clinic visit is planned, and what you’re thinking about in terms of attendance. That information is enough to open the conversation.
The right timing for going back comes from aligning two things: the physician’s guidance and the nursery or kindergarten’s own policies. Neither alone is sufficient in every case.
| Category | What to share or confirm with the nursery or kindergarten |
|---|---|
| To share | The diagnosis, or the suspected illness name |
| The date symptoms began and when fever or rash appeared | |
| Current status: fever, mouth pain, appetite, fluid intake, eye symptoms | |
| What the physician said about when your child can return | |
| To confirm | When the nursery or kindergarten considers return to be appropriate |
| Whether a return notification form, physician’s advisory statement, or doctor’s clearance note is required |
Message templates for notifying your nursery or kindergarten (by illness)
Below are ready-to-use message templates for contacting your hoikuen or yochien. Adjust the details to match your child’s actual situation and the preferred contact method.
For hand, foot and mouth disease or herpangina
This is [child’s name]’s parent, [your name]. Our child was diagnosed with hand, foot and mouth disease / herpangina today. They currently have a fever and mouth pain that is making it difficult to eat. We will monitor their recovery and would like to confirm your return criteria and any procedures we need to follow when we are ready to come back.
For pool fever (pharyngoconjunctival fever)
This is [child’s name]’s parent, [your name]. Our child was diagnosed with pharyngoconjunctival fever (pool fever) today. We plan to follow both the physician’s guidance and your criteria when deciding when to return. Could you please let us know your return guidelines and whether any documentation will be required?
There’s no need for long messages. During the busy morning hours, what matters most is that the key information is clear and organized.
From the nursery staff’s perspective, receiving information early from families makes their planning considerably easier — whether other children are showing similar symptoms, whether the child can participate in lunch or water activities, or whether extra monitoring is needed during nap time. A timely message supports the whole setting.
Preventing spread within the family
Within the household, consistent handwashing, avoiding shared towels and utensils, and thorough handwashing after diaper changes are the most important preventive measures.
Once one child is ill, the next concern is naturally whether the illness will spread to other family members. This is especially true if there’s a younger sibling who is still an infant, or if elderly grandparents are living in the home.
HFMD, herpangina, and pool fever all require attention to droplet and contact transmission. With HFMD in particular, fecal-oral transmission is well documented, which makes careful handwashing after diaper changes especially important.
JIHS notes in its detailed HFMD information that the virus can be shed in stool for two to four weeks after symptoms have resolved — meaning a child can remain a potential source of transmission even after they appear to have fully recovered. Continue careful handwashing and diaper hygiene for some time after recovery.
（参照：Hand, Foot and Mouth Disease (Detailed) | Japan Institute for Health Security (JIHS)）
Families with infants or younger siblings
Young children can’t consistently wash their own hands, and they share toys and towels easily — which makes household transmission within families common.
Where possible, keep the sick child’s towels, cups, spoons, and dishes separate from those of other family members. Toys that tend to go in mouths should be washed or wiped down after use.
Dispose of diapers promptly, and make sure both adults and children wash their hands thoroughly with running water and soap after each diaper change. Family-wide handwashing is the most practical and sustainable protective measure you can maintain.
Key household infection prevention measures
- Wash hands after returning home, before meals, after using the toilet, and after diaper changes
- Avoid sharing towels, cups, and utensils
- Dispose of diapers and bodily waste carefully
- Wash hands after wiping eye discharge
- Wash or wipe down toys that children put in their mouths regularly
Trying to disinfect everything perfectly is exhausting for whoever is doing the caregiving. Focus on the four priorities first: handwashing, towels, dishes, and diaper hygiene — those cover the most ground.
Common questions answered
Covering the questions parents and nursery staff ask most often: when to go back, rashes, siblings, clearance notes, and nail changes after HFMD.
- Q1. If the fever is gone, can my child go back the next day?
- Not necessarily. For HFMD and herpangina, the guideline is that fever and the effects of oral blisters or ulcers have resolved and the child can eat normally — not just that the temperature has come down. For pool fever, the statutory criterion is that at least two days have passed after all major symptoms have resolved. In all cases, check with the nursery or kindergarten before going back.
- Q2. How many days should my child stay home with HFMD?
- HFMD does not carry a statutory exclusion period the way pharyngoconjunctival fever does. The general benchmark is that fever has settled and mouth pain has eased enough that the child can eat normally. Always confirm expectations with both your physician and the nursery or kindergarten.
- Q3. Can herpangina or HFMD be confirmed through a test at the clinic?
- In most cases, physicians assess these conditions based on clinical presentation and examination findings rather than specific laboratory testing. You don’t need to determine the illness name at home. When you visit the clinic, focus on describing where the rash appeared, how the fever has progressed, how much pain there is in the mouth or throat, and whether your child is able to drink fluids.
- Q4. How long does a child need to stay home from hoikuen or yochien with pool fever?
- The statutory criterion for pharyngoconjunctival fever (PCF) is that two days must have passed after all major symptoms have resolved. Since symptoms can continue for several days before that window starts, the total time away is often somewhere between several days and around a week. The actual number of days depends on how your child’s symptoms progress and should be confirmed with the nursery or kindergarten.
- Q5. Could siblings catch it?
- Yes, household transmission is possible. Consistent handwashing, avoiding shared towels and utensils, and careful handwashing after diaper changes are the key preventive measures. If a sibling develops fever, rash, sore throat, or red eyes, notify the nursery or school and seek medical attention if needed.
- Q6. Is a doctor’s clearance note required before returning?
- This varies by nursery, kindergarten, and municipality. For HFMD and herpangina, a formal physician’s advisory statement is not always required under national guidelines — but individual nurseries and kindergartens may have their own return notification process. For pool fever, some childcare providers may request a doctor’s clearance note. Always confirm the requirements directly with your child’s nursery or kindergarten.
- Q7. Can nails fall off after HFMD?
- JIHS notes that nail loss — onychomadesis — has been reported in some children several weeks after HFMD. In most cases the nails grow back naturally. However, if you notice pain, redness, swelling, bleeding, or signs of infection, or if you’re simply unsure about what you’re seeing, consult a pediatrician or dermatologist.
（参照：School Infectious Diseases and Exclusion Period Standards | Japan Pediatric Society）
（参照：Hand, Foot and Mouth Disease (Detailed) | Japan Institute for Health Security (JIHS)）
Don’t let the phrase “earlier than usual” run away with you
Editor’s note
Staying informed about infectious diseases matters — but so does not being driven by anxiety-amplifying language.
The news that Kagoshima Prefecture issued an HFMD epidemic alert in May 2026 is genuinely relevant to families with children in hoikuen or yochien — it shouldn’t be ignored.
At the same time, framings like “the season is running early this year” or “it’s already spreading across Japan” deserve some scrutiny. HFMD activity emerging in southern Kyushu in May is not inherently unusual within the seasonal pattern of summer childhood illnesses. An alert is not something to dismiss — but interpreting it as a uniform national surge requires data from multiple regions and the most recent weekly figures.
Parents raising young children already brace themselves when summer approaches, knowing the season brings its share of illness in group care settings. When strong-sounding language arrives on top of that, it can push people into unnecessary anxiety, or into second-guessing decisions that were actually reasonable.
What TamagoDaruma tries to do is deliver accurate information at a measured temperature.
Not to rush parents back to the nursery or kindergarten. Not to make them feel guilty for keeping their child home. But to give families the information they need to observe their child, talk to their childcare provider, and check with a physician when needed — and to act on that information with confidence.
Summary: Return decisions work best with physician guidance and nursery policy together
HFMD, herpangina, and pool fever may share some surface similarities, but their return-to-daycare frameworks are different.
HFMD is distinguished by its blister-like rashes across the hands, feet, and mouth. Herpangina presents with sudden fever and deep-throat sores. Pool fever (pharyngoconjunctival fever) involves fever, sore throat, and conjunctivitis.
- HFMD and herpangina: No statutory exclusion period. Going back to daycare is guided by resolution of fever and oral symptoms, and the child’s ability to eat normally.
- Pool fever (pharyngoconjunctival fever): A statutory exclusion period applies — at least two days after all major symptoms have resolved.
- Across all three: The key is to confirm that the child is genuinely ready to get through a day at the nursery or kindergarten, that the facility’s criteria are met, and that the physician’s guidance has been followed.
When you find yourself wondering “is it okay to send them back today?” — the most useful question to ask is: “Can my child manage a regular day at the hoikuen or yochien without pushing themselves?” Working through the official guidelines, a physician’s input, and your nursery or kindergarten’s policies together gives you something solid to stand behind — and that matters for your own peace of mind as a parent too.
This summer, we hope you’re able to stay grounded rather than overwhelmed — prepared, but not anxious. Children recover. The support around them matters. And so does yours.
