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Communicable Diseases

Communicable diseases are infectious diseases that pose a threat to public health, including emerging and re-emerging infectious diseases, vaccine preventable agents, bacterial toxins, and pandemics. 

Depending on the illness, schools are required to distribute exposure notices, exclude a child from school, and/or call the Santa Clara County Public Health Department. 

Copies of exposure notices can be found at the Santa Clara County Public Health Department Exposure Notices for Schools and Child Care webpage. Below is a list of communicable diseases with their exclusion criteria and when they're okay to return. 

Communicable Disease Exclusion Table

Disease/Condition Exclusion Return
Amebiasis Yes If not a food handler, 48 hours after symptoms resolve
Bed Bugs No N/A
Campylobacter Yes After diarrhea resolves
Chickenpox Yes After all blisters have scabs
C. diff Yes 48 hours after diarrhea resolves
COVID-19 Yes, if symptomatic Follow Covid Updates in the below drop down
Cryptosporidiosis Yes 48 hours after symptoms resolve, and stay out of public swimming pools until 2 weeks after diarrhea resolves
E. coli Yes If not restricted, 48 hours after symptoms resolve
Giardia Yes 48 hours after symptoms resolve
Hand, foot, and mouth disease Yes, if symptoms include fever or uncontrolled drooling with mouth sores After fever free for 24 hours without fever-reducing medication; children should not return with difficulty or pain while eating or drinking
Head lice Yes, but they do not need to be sent home immediately; they can stay until the end of the day After receiving appropriate treatment
Hepatitis A Yes 7 days after onset of jaundice (or onset of symptoms if no jaundice) and diarrhea resolves
HiB (Haemophilus influenzae type b) - Invasive Yes When 24 hours have passed after starting antibiotics and symptoms are improving
Impetigo Yes, but they do not need to be sent home immediately; they can stay until the end of the day (keep blisters covered) After starting appropriate treatment; keep blisters covered until they are dry
Influenza No, unless case meets symptom-based exclusion criteria (see Student Illness webpage) After exclusion criteria are resolved
Measles Yes Per direction of the Public Health Department
Meningococcal meningitis Yes Per direction of the Public Health Department
MRSA No N/A
Mumps Yes Per direction of the Public Health Department
Norovirus Yes If not a food handler and there is not an outbreak, after symptoms resolve
Parvovirus B19 (Fifth disease) No, unless they have a fever After fever-free for 24 hours without the use of fever-reducing medication
Pertussis (Whooping cough) Yes After 5 days of appropriate antibiotic treatment
Pink eye (Conjunctivitis) No N/A
Pinworm No N/A
Respiratory syncytial virus (RSV) No, unless case meets symptom-based exclusion criteria (see Student Illness webpage) After exclusion criteria are resolved
Ringworm Yes, but they do not need to be sent home immediately; they can stay until the end fo the day

General population: after starting treatment

Athletes with tinea corporis: 72 hours after starting treatment unless the affected area can be covered

Roseola (Sixth disease) No N/A
Rotavirus Yes If not a food handler and there is not an outbreak, after symptoms resolve
Rubella Yes 7 days after rash appeared
Salmonella Yes If not restricted, 48 hours after symptoms resolved
Scabies Yes After receiving appropriate treatment
Shingles No, unless rash cannot be covered When rash can be covered or when all lesions have crusted
Shigella Yes If not restricted, 48 hours after symptoms resolve
Strep throat/Scarlet fever Yes When 12 hours have passed after starting antibiotics and symptoms are improving
Typhoid/Paratyphoid fever Yes If not restricted, 48 hours after symptoms resolve

If you have questions please contact Health Services.