Before Apollo it is possible that missions like Surveyor 3 were contaminated with bacteria like Streptococcus mitis which may have been found on components of S

Before Apollo it is possible that missions like Surveyor 3 were contaminated with bacteria like Streptococcus mitis which may have been found on components of Surveyor 3 returned by Apollo astronauts: https://en.wikipedia.org/wiki/Surveyor_3 https://en.wikipedia.org/wiki/Surveyor_3