PERSPECTIVE. For the article “Planetary exploration in the time of astrobiology: Protecting against biological contamination” by John D. Rummel, which appeared in number 5, February 27, 2001, of Proc. Natl. Acad. Sci. USA (98, 2128–2131), the author notes the following correction. On page 2129, the article stated that astronauts from Apollo 11 and 12 were quarantined, but it should have stated that astronauts from Apollo missions 11, 12, and 14 were quarantined. The period of quarantine for the crew was 21 days from their last lunar-surface exposure, whereas the 30 days mentioned in the article was the designed time-period for completion of lunar sample safety protocols.
. 2001 Apr 3;98(8):4815. doi: 10.1073/pnas.091112698