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A Sample Returned from (162173) Ryugu Contaminated by Earth Microorganisms - PMSchu - 2024-11-24
Here's an article that describes the contamination that occurred during the preparation of a return sample from the asteroid (162173) Ryugu:
https://phys.org/news/2024-11-ryugu-asteroid-sample-rapidly-colonized.html
Despite sample preparation in a Class 10,000 clean room and use of decontaminated tools, the analysis indicated that one of the samples was contaminated by earth microorganisms after the sample returned from space.
Earth bugs are tough, just ask the martians in War of the Worlds.
Phil S.