Quarantine "yellow jack" but this was also a name for yellow fever, which probably derives its common name from the flag, not the color of the victims (cholera ships also used a yellow flag). The plain yellow flag ("Quebec" or Q in international maritime signal flags) probably derives its letter symbol for its initial use in "quarantine", but this flag in modern times indicates the opposite—a ship that declares itself free of quarantinable disease, and requests boarding and routine port inspection. Australia has perhaps the world's strictest quarantine standards. Quarantine in northern Australia is important because of its proximity to South-east
Götheborg (ship) largest of all the SOIC vessels and it made three journeys to Canton: 2February 1788–13May 1790, 13November 1791–12June 1793, and on 5December 1795, the ship sailed for Canton but was lost at Cape Town on 8March 1796, on the way out from Gothenburg. The East Indiaman "Götheborg" is classified as a passenger ship sailing under the ordinary Swedish flag. But when in port, the ship is entitled to fly the old swallowtailed version of the flag, the SOIC flag ("Svenska Ostindiska Companiet", "Swedish East India Company"), that the original vessel sailed under. The flag used on Swedish boats is the