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What I ment by "natural" is that it wouldn't be something that is normally on this earth that our bodies have developed to combat. It would be completely alien, and therefor possibly more dangerous. However an alien virus might not even effect humans because it wouldn't know how to attack us.
In November, 1969, the Surveyor 3 spacecraft's microorganisms were recovered from inside its camera that was brought back to Earth under sterile conditions by the Apollo 12 crew.
The 50-100 organisms survived launch, space vacuum, 3 years of radiation exposure, deep-freeze at an average temperature of only 20 degrees above absolute zero, and no nutrient, water or energy source.