(a) The period of isolation in accordance with Section 2518 shall be until the acute symptoms have subsided.

The patient shall be subject to supervision by the local health officer who may require, at his discretion, release specimens of feces for testing in a laboratory approved by the State Department of Health Services. However, no patient shall be released from supervision to engage in any occupation involving the preparation, serving or handling of food, including milk, to be consumed by individuals other than his immediate family, nor to engage in any occupation involving the direct care of children or of the elderly or of patients in hospitals or other institutional settings until two successive authentic specimens of feces or of rectal swabs, taken at intervals of not less than 24 hours, beginning at least 48 hours after cessation of specific therapy, if any was administered, have been determined, by a public health laboratory approved by the State Department of Health Services, to be negative for Shigella organisms. (See Section 2534.)

(b) Contacts. Restrictions on contacts shall be at the discretion of the local health officer.