This outreach piece in Nature describes the aspects of bringing various guests on field science expeditions. The PolarTREC program is a focus amongst the programs providing some best practices as the author offers advice to scientists considering the addition of guests on expeditions.
Antarctica is the coldest, driest place on Earth with a fairly limited number of native species which have adapted to these extreme conditions over millions of years. As a result, it's not very likely that a non-native species would survive there . . . right? Actually ever since exploration and exploitation of the Antarctic region began in the 1800's