Planetary quarantine. Part 2. Back contamination.
D003666:Decontamination; D004781:Environmental Exposure; D004787:Environmental Pollution / Q000517:prevention & control*; D005118:Extraterrestrial Environment; D006801:Humans; D008722:Methods; D008829:Microbiology; D011790:Quarantine; D013026:Space Flight; D013242:Sterilization; D014481:United States