32. Without prejudice to any other provision in these regulations the additional measures in schedule 4 shall be applicable on the arrival of—
(a)any infected ship or suspected ship;
(b)any ship which has during its voyage been in an area infected with plague, cholera, yellow fever, lassa fever, rabies, viral haemorrhagic fever or marburg disease;
(c)any suspect for smallpox on a ship other than an infected ship;
(d)any other ship when the medical officer is satisfied that, notwithstanding that measures equivalent to such additional measures have been applied to the ship or any person on board at a previous port during its voyage, there is on board or has been on board since such previous application an infected person or suspect and that it is necessary again to apply any such measure, or the medical officer has evidence that such previous application was not effective.