Measles is spread through droplet transmission from the nose, throat, and mouth of someone who is infected with the virus. These droplets are sprayed out when the infected person coughs or sneezes. Among unimmunized people exposed to the virus, over 90% will contract the disease. The infected person is highly contagious for four days before the rash appears until four days after the rash appears. The measles virus can remain in the air (and still be able to cause disease) for up to two hours after an infected person has left a room.
Measles is spread through the air, and airborne precautions need to be taken to avoid transmission to people who haven't had, or haven't been immunized to the disease. We say that measles is an airborne disease because the droplet nuclei size is less than 5 microns. Barrier protection in the hospital includes a private negative air flow room. Infants are immunized against measles with the MMR shot (measles, mumps, rubella)...and a booster given before they begin school. Children must have proof of immunization in order to attend school.
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