Space Makes Bacteria More Dangerous

Experiments show that a germ causing food poisoning and other illnesses can be three times more dangerous in space than on the ground. This only adds to the endless list of risks that astronauts need to be aware with when possibly going on a manned mission to mars or even the moon. The study also shows that the immune system weakens during longs trips in space. That means your bodies immune system would definitely be susceptible on a mission to Mars. So the lesson to be learned here: our future astronauts to Mars better have strong immune systems otherwise who knows how ill they could become

http://www.space.com/scienceastronomy/070924_space_germs.html