Measles spreads easily and can linger in a space suspended within small droplets for one or even two hours after a contagious person has vacated that space, Graham Snyder, medical director of Infection Prevention and Hospital Epidemiology at the University of Pittsburgh Medical Center, tells Inverse. He says this makes measles particularly pernicious.
If you were born before 1963, individuals most likely have immunity from natural infections since, at that time, measles was a common childhood disease. They, therefore, are "presumed to be protected against measles, mumps, and rubella" under what's called presumptive immunity. There are some infrequent exceptions to this rule. In some people, immunity from measles may wane over time, says Orenstein, but that's pretty rare. But they may need to be vaccinated at least with one dose of the measles, mumps, and rubella (or MMR) vaccine.
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