Head lice exclusion and return-to-school letters
This is the individual-family letter, which is a different document from the classroom notice and gets confused with it constantly. Here it is by finding — live lice, nits only, a repeat case, a family who cannot afford treatment — with the re-check process written out, because the re-check is where a well-run policy turns into a humiliation.
| Finding | What it means clinically | Same-day action under current guidance | Return criterion where a district does exclude |
|---|---|---|---|
| Live louse seen | Active infestation | Notify family, keep student in class, send treatment guidance | One treatment completed |
| Nits within ¼ inch of scalp, no live louse | Possible active infestation; not diagnostic on its own | Notify family, recommend a wet-comb check at home | Treatment or documented check |
| Nits more than 1 inch from scalp | Almost certainly old or hatched | No action beyond a note home if asked | Not a defensible exclusion basis |
| Hair casts or dandruff mistaken for nits | Not lice at all | Reassure, document, no notification | n/a |
| Repeat finding within 7–10 days | Expected — the second treatment is usually still due | Confirm the treatment schedule with the family | Second treatment completed |
| Repeat finding beyond 3 weeks | Re-infestation or incomplete treatment | Conversation, not a letter; look for a household or contact source | Treatment plus household plan |
| Fourth or later case in a semester | Usually an access or capacity problem, not neglect | Case conference with the family; involve social work if available | Plan agreed, not a threshold met |
| Sibling of a confirmed case | Elevated likelihood | Check with family permission; notify regardless | Same as the index case |
The return column describes what districts that still exclude typically require. Current CDC, AAP and NASN guidance is that exclusion is not warranted at all. Whether your district may exclude, and on what finding, is set by board policy and in a few places by state health guidance — confirm yours rather than adopting the column.
The ten letters
1. Live lice found, no exclusion (recommended default).
Dear [PARENT NAME],
I checked [STUDENT FIRST NAME] today and found live head lice. I am writing so you can treat it this evening.
[STUDENT FIRST NAME] stayed in class today and can come to school as normal tomorrow. Head lice do not carry disease and are not a reason to miss school.
What to do: use an over-the-counter head lice treatment following the instructions on the package exactly, including the second application, which is usually needed around day 9 — the first treatment does not always kill eggs, and skipping the second is the most common reason lice come back. Comb through wet, conditioned hair with a fine-toothed comb every few days for the next two weeks. Wash recently used bedding and clothing in hot water. You do not need to treat the whole house, bag toys, or hire anyone.
Please check everyone else at home, and let me know what you find so I can check siblings here.
If the cost of treatment is difficult, call me. [DISTRICT] can help and this is a call I take often.
[NAME], RN — [PHONE]
2. Nits only. Says what was found, says it may be old, recommends a wet-comb check rather than automatic treatment, and does not treat it as a case unless a live louse is found.
3. Repeat case in the same family. The letter that most needs a phone call instead. If it must be written: This is the [Nth] time we have found lice since [DATE]. That usually means one of three things — the second treatment was missed, someone else at home has it, or there is a contact outside school. None of those is a failure on your part. Can we talk this week?
4. Family with no treatment access. No mention of cost until the family raises it, then a direct offer: what the district can provide, where the local resource is, and the sentence about a prescription option, because prescription treatments are frequently covered where over-the-counter products are not.
5. Household where English is not the home language. Not a translation of variant 1 — a shorter version with fewer conditional clauses, because conditional clauses translate worst. Then translated.
6. Chronic or uncooperative case escalation. Careful. Repeated infestation is far more often an access problem than a neglect problem, and a letter that reads as an accusation will end the relationship you need. Escalate to a conversation and, if there is genuine concern about a child's welfare, follow your district's own reporting process rather than inventing one in a letter.
7. Sibling notification. To the same household, about the other children, in one sentence.
8. Re-check pass. I rechecked [STUDENT FIRST NAME] today and found no live lice. Nothing further is needed. Please keep combing through for another week to catch anything that hatches.
9. Re-check fail. The hardest letter to write without shame in it. State the finding, state the most likely reason (usually the second treatment timing), state what happens next, and do not repeat the instructions as though the family failed to read them.
10. Family who believes the school is the source. Do not argue. We do not know where it came from, and in practice it is very rarely possible to know. What I can tell you is what we are doing in the classroom and how to check at home.
The re-check, which is where policies go wrong
If your district excludes or requires a re-check, the re-check is the part that determines whether the policy is humane. Written badly, it means a child sits in the office in front of everyone while a nurse combs their hair, then goes back to class where everyone knows what just happened.
What a good re-check process looks like:
- Scheduled, not opportunistic. A named time, agreed with the family, ideally at the start of the day so the child does not lose class time waiting.
- Private. Not the front counter, not the corridor, not with the door open.
- Quick and matter-of-fact. The nurse's manner is the entire experience for the child.
- Logged the same way every time. Date, finding, who checked, what was communicated, in what language. Keep it in the health record, not on a clipboard at the counter where other families can read names.
- Ended deliberately. Somebody has to decide the case is closed and tell the family. Cases that trail off without a closing message are the ones that generate a complaint six weeks later.
A practical detail worth stating: the re-check log should never live anywhere a visitor can see it. A list of children's names next to the words "lice re-check" on a health office desk is a disclosure to every parent who walks in, and it is the most common privacy failure in this whole area.
Treatment access, said out loud
The single most useful paragraph in any lice letter is the one about cost, and most district templates leave it out.
Over-the-counter treatments run to real money for a family with several children, and repeat treatments multiply it. Prescription options exist, and in many cases a prescription is covered by Medicaid or CHIP where the over-the-counter product is not — which means a phone call to a provider can convert a $60 problem into a $0 problem. That is a specific, actionable thing a school nurse knows and a family often does not.
Language that works, in the letter and on the phone:
If buying the treatment is a problem, please call me. This is a common call and there are usually options — including a prescription version that your child's insurance may cover when the store version is not covered. I would much rather help you sort this out than have you worry about it.
Spanish: Si el costo del tratamiento es un problema, por favor llámeme al [TELÉFONO]. Es una llamada muy común y casi siempre hay opciones, incluyendo una versión con receta médica que su seguro puede cubrir aunque no cubra la de la farmacia. Prefiero ayudarle a resolverlo.
Notice that neither version asks the family to declare hardship. Requiring a family to say "I cannot afford this" before help is offered is why the offer goes unused.
Documenting it, and what a platform contributes
Individual lice correspondence is health-record material and belongs in the student health record, kept to the same standard as anything else in it. A parent letter about a named child is not a mass communication and should not be sent as one.
Do not send individual clinical letters through a mass-notification tool by default. That is true of Kastr and of every competitor. A one-to-one letter about a named child's health goes through the channel your district uses for health records — usually paper, sealed, or a direct call. Where a comms platform earns its place is the surrounding traffic: telling a family a letter is coming, arranging the re-check time, and the class-level notice. Kastr's audit log will show you exactly what was sent to which household in which language and what the delivery outcome was, and because the log is append-only at the database role and hash-chained per district, it is a record that is tamper-evident rather than merely stored.
One further limitation to plan around: Kastr carries no attachments, so a treatment-instruction sheet cannot be attached to a message. Either put the instructions in the body of the email, hand them over on paper, or host them somewhere you can link to.
Questions people actually ask
Can I send a child home the same day for live lice?
That depends entirely on your district policy, and current professional guidance says you should not. CDC, AAP and NASN all advise against exclusion for head lice, on the grounds that transmission has already occurred by the time a case is found and that the lost instruction is real. If your board policy still requires same-day exclusion, follow it and pursue the change through the policy route rather than deviating case by case.
How are lice absences coded, and does exclusion change that?
It usually does. An absence the district caused by excluding a student sits in a different category in most state attendance frameworks from an absence a family chose. Ask your attendance office how they code a school-initiated health exclusion before you rely on either answer, and be aware that if the coding is wrong it affects both the chronic-absenteeism denominator and, in average-daily-attendance states, funding.
What do I write to a family with a fourth case in one semester?
Ideally nothing — call them. Repeat infestation is far more often about treatment cost, a household contact who has not been treated, or a missed second application than about anything else, and a fourth letter reads as an accusation. If you do write, name the three usual causes, say explicitly that none of them is a failure on the family's part, and ask for a conversation this week.
Do I need parental consent to check a student's head?
Practice varies by district and sometimes by state, and it is worth having a written answer before you need one. Many districts treat a head check as routine health-office care covered by general enrolment consent; others require specific consent, and some families object on religious or personal grounds. Establish your district's position with your school health services lead, and in any case tell the child what you are doing and why before you do it.
Should the school notify the family before or after the classroom letter goes out?
Before, always, and with enough of a gap that the family is not learning about it from another parent. A household that finds out their child's case triggered a class letter, after the class letter arrived, will feel exposed — and they are the ones best placed to notice if the notice identifies their child.
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