We have never heard of the Moon as much as we have in recent years. There were several exploratory missions, both orbital and on lunar soil.Of the 11 manned missions of the Apollo project, 6 landed on the Moon, the Apollo 11 mission being iconic: Astronaut Neil Armstrong uttered the anthological phrase "This is a small step for man, but a big leap for humanity". We can infer that the Moon was probably contaminated with microorganisms carried by the Terrans.
And NASA no longer seems to be concerned about this, coupled with the lack of interest in the question of life on the Moon. So much so that it recently changed its policy on space missions.
NASA has updated its policy regarding the amount of contaminants that may remain on the Moon during one of its missions: it downgraded the classification of the natural satellite to category I. This simply means that there are no longer any expectations of finding any kind of life over there; exception are craters with frozen water.
In other words: everything is released, so to speak. There is basically no concern for contaminating the lunar soil or the lunar environment. Especially because soon we will probably have to make landfills there, since besides the scientific interest, the tourist interest is more than clear.
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