Re: No it doesn't . . .
<Soil analysis from the Viking landings showed high concentrations of hydrogen peroxide in the soil, a strong germ killer. That alone means that Mars is a self-sterilizing planet.
The same could be said for a lander testing soil content of a borax field, or the waters of the Dead Sea, with the same potential for error. These are isolated examples, and by no means imply a global condition. Nor do the tests of the Viking landers cover more that a few centimeters of surface content.
You seem to see the Solar system, and Mars in particular, and completely explored, where I do not.
As I stated above, "We'll have to see",
Dan