I can anecdata the problem of misdiagnosing nits: when the Fanlet was in preschool we picked her up one day and one of the teachers took me aside and said they'd found nits in her hair that afternoon. We got home, and I searched and searched her scalp, and found nothing. Then, after dinner, I was doing dishes, including the lunch I had packed for her that day. She'd had a quinoa salad. Cooked quinoa apparently looks like lice nits to the casual observer, and 3 year olds are not necessarily the most fastidious of eaters.
no subject
The CDC suggests treating lice but not otherwise inhibiting attendance: https://www.cdc.gov/parasites/lice/head/parents.html and https://www.cdc.gov/parasites/lice/head/schools.html
National Association of School Nurses suggests no attendance changes, no classroom screening, and no broad notifications: https://www.nasn.org/nasn-resources/professional-practice-documents/position-statements/ps-head-lice
I can anecdata the problem of misdiagnosing nits: when the Fanlet was in preschool we picked her up one day and one of the teachers took me aside and said they'd found nits in her hair that afternoon. We got home, and I searched and searched her scalp, and found nothing. Then, after dinner, I was doing dishes, including the lunch I had packed for her that day. She'd had a quinoa salad. Cooked quinoa apparently looks like lice nits to the casual observer, and 3 year olds are not necessarily the most fastidious of eaters.