(a) Upon receiving a report made pursuant to Section 2500 or 2505, the local health officer shall take whatever steps deemed necessary for the investigation and control of the disease, condition or outbreak reported. If the health officer finds that the nature of the disease and the circumstances of the case, unusual disease, or outbreak warrant such action, the health officer shall make or cause to be made an examination of any person who or animal which has been reported pursuant to Sections 2500 or 2505 in order to verify the diagnosis, or the existence of an unusual disease, or outbreak, make an investigation to determine the source of infection, and take appropriate steps to prevent or control the spread of the disease. Whenever requested to do so by the Department, the health officer shall conduct a special morbidity and mortality study under Health and Safety Code Section 211 for any of the diseases made reportable by these regulations.

(b) If a disease is one in which the local health officer determines identification of the source of infection is important, and the source of infection is believed to be outside the local jurisdiction, the health officer shall notify the Director or the health officer under whose jurisdiction the infection was probably contracted if known. Similar notification shall be given if there are believed to be exposed persons, living outside the jurisdiction of the health officer, who should be quarantined or evaluated for evidence of the disease.