Measles can linger in an empty room for hours
If infectiousness were an Olympic sport, measles would take the gold every time. It is so outrageously contagious that a single infected person can transmit the virus to up to 18 susceptible people. Furthermore, the virus can linger in the air of an empty room for two hours after the infected person has left, setting a silent, invisible trap for anyone who walks in next.

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