No instructor, teacher, pupil, or child who resides where any contagious, infectious, or communicable disease exists or has recently existed, that is subject to strict isolation or quarantine of contacts, shall be permitted by any superintendent, principal, or teacher of any college, seminary, or public or private school to attend the college, seminary, or school, except by the written permission of the health officer.
Source:
Section 120230, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=120230..