New Zealand Legislation: Regulations
Regulations are laws made under Acts
(1) No carrier of diphtheria shall be isolated or continue to be isolated after two successive microbiological examinations of pharyngeal and nasal swabs, taken at intervals of not less than 24 hours and not within 12 hours of local application of antibiotic or chemotherapeutic agent, have failed to show the presence of diphtheria bacilli.
(2) Where any carrier of diphtheria remains positive after a period of three weeks in isolation as a carrier he shall be discharged from isolation on his undertaking faithfully to carry out the instructions of the Medical Officer of Health in regard to his conduct as a carrier.