Alien Infection SpaceDaily

When diseases like SARS, Mad Cow Disease and Monkeypox cross the species barrier and infect humans, they dominate news headlines. Just imagine, then, the reaction if potentially infectious pathogens were found in rock samples from Mars. As we look toward exploring other worlds, and perhaps even bringing samples back to Earth for testing, astrobiologists have to wonder: could alien pathogens cross the “planet” barrier and wreak havoc on our world?