(a) The patient shall be isolated in accordance with Section 2518 until the end of the febrile period and until all acute symptoms have subsided.

(b) Contacts. Quarantine of contacts is not required, except at the discretion of the local health officer, but intimate contacts should be kept under frequent medical observation for a minimum of three days subsequent to diagnosis of the case. Prophylactic treatment of household contacts under medical supervision may be required by the health officer prior to release.