Streptococcus mitis
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Streptococcus mitis is a mesophilic alpha-haemolytic species of Streptococcus that inhabits the human mouth. It can cause endocarditis. It has been widely reported that this organism survived for over two years on the Surveyor 3 probe on the moon. However this claim is now discounted by NASA scientists: see myth of Streptococcus mitis on the moon.