Major US airport placed on alert after a passenger was reported to have a highly contagious illness

Medical information released by officials indicates that the infected individual had previously received one dose of the MMR vaccine, which provides partial immunity against measles

However, health experts note that while one dose reduces the risk of infection, it does not provide the same level of protection as the full two-dose regimen.

Despite this partial vaccination history, the individual developed symptoms consistent with measles several days after potential exposure.