On a long spaceflight, it could be easy for microbes to get out of control. Microgravity weakens the immune system while it also increases the virulence and antimicrobial resistance of some microorganisms.
“You suppress the human immune response, and you enhance the ability of microbes to cause infection, and you put those together in a confined space where airborne particles can remain in the air for a protracted period of time,” says Brown University’s Leonard Mermel.
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