The Health Officer shall prohibit the embarkation or re-embarkation on any ship of(a)any person showing symptoms of any quarantinable disease, and(b)any person whom the Health Officer considers likely to transmit infection because of his close contact with a person showing symptoms of a quarantinable disease :Provided that a person on an international voyage who on arrival is placed under surveillance may be allowed to continue his voyage, but the health authority for the next port of call shall be apprised of this fact.
