Adenoviruses are often spread by touching a contaminated person or surface, or through the air by coughing or sneezing. They are known to persist on unclean surfaces and medical instruments for long periods of time, and they may not be eliminated by common disinfectants, but they rarely cause severe illness in healthy people. However, people with weakened immune systems have a higher risk for severe disease, and they may remain contagious long after they recover, according to the CDC.
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