Section 33 in The Merchant Shipping (Crew Accommodation) Rules, 1960
33. Protection from Mosquitoes.
(1)In every ship to which these rules apply, being a ship regularly engaged on voyages to any port to which this rules relates, the crew accommodation, other than galleys, store rooms and recreation spaces on the open deck shall be provided with protection against the admission of mosquitoes. Such protection shall be provided by means of screens of rust proof wire or other suitable material which shall be fitted to all side scuttles, natural ventilators, skylights and doors leading to the open deck.(2)Any door to which such screens are fitted being a door at the entrance to a permanent or temporary hospital in a ship to which these rules apply, shall be of a self-closing type.(3)The ports to which this rule relates are the followings:-(a)Ports between 200 South latitude on the coasts of ---(i)Africa, excluding port Sudan and Massawa :(ii)Asia, excluding the East Indian Archipelago and the Philippine Island, but excluding Aden, Bombay, Madras, Vizagapatmam, Colombo, Trincomalee, Singapore, Penang and Port Swettenham:(b)Ports on the coasts of Madagascar.
