Section 20(3) in The Indian Port Health Rules, 1955
(3)A healthy ship is any ship other than a ship infected or suspected of infection with plague. Even when coming from a plague infected area or having on board a person coming from a plague-infected area a ship shall be regarded as healthy, if on medical examination, the Health Officer is satisfied that the conditions specified in sub-rules (1) and (2) of this rule do not exist.
