(1) For a confirmed case of diphtheria, isolation of an infected person must be imposed until two cultures, taken not less than 24 hours apart and not less than 24 hours after cessation of antimicrobial therapy, from nose and throat fail to show diphtheria bacilli. Where culture is impractical, isolation may end after 14 days of appropriate antibiotic therapy.

(2) All household contacts must be placed under quarantine by the local health officer until their nose and throat cultures are negative.

(3) All infectious persons must be treated unless medically contraindicated.

(4) A contact in a sensitive occupation must be excluded by the local health officer from work until the contact is determined not to be an infectious person.

(5) The local health officer must initiate surveillance for susceptible contacts and must recommend immediate immunization to any such contact found.