(a) Under ordinary circumstances, isolation of cases and quarantine of contacts are not required.(b) Persons who are found to be excreting Endamoeba histolytica in the feces shall be prohibited from public food handling until three feces specimens, taken at intervals of not less than three days, shall be proved negative for the organism by a public health laboratory approved by the State Department of Health Services.Cal. Code Regs. Tit. 17, § 2550