A body temperature ≥100.4°F
One or more episodes of vomiting
Two or more episodes of diarrhea
Presenting with symptoms of contagious illnesses-- such as COVID-19, strep throat, conjunctivitis, influenza, impetigo, undiagnosed rash- "Any student retained at home or excluded from school by reason of having or being suspected of having a communicable disease shall not be readmitted to his/her classroom until he/she presents written evidence of being free of communicable disease." https://www.straussesmay.com/seportal/Public/DistrictPolicy.aspx?policyid=8451&id=c0ca7e9c971a4830920ca21592517b0a
Head Lice-- "A student who is found to have active head lice will not be permitted to attend school until there are no active lice in the student’s hair, proof of treatment has been provided to the nurse, and until all live and/or dead head lice are removed from the student’s hair as confirmed by an examination by the school nurse. The presence of nits (the eggs of lice) without active head lice will not prohibit a child from attending school provided proof of treatment has been provided to the nurse and there is no evidence of active head lice in the student’s hair." https://www.straussesmay.com/seportal/Public/DistrictPolicy.aspx?policyid=8454&id=c0ca7e9c971a4830920ca21592517b0a
Serious injury