A healthy ship shall be given free pratique but, if it has come from a plague area, the Health Officer may(a)place under surveillance any suspect who disembarks, for a period of not more than six days, reckoned from the date on which the ship left the infected area; and(b)require the destruction of rodents on board the ship in exceptional cases and for well-founded reasons which shall be communicated in writing to the master;B. Cholera
