International measles importations United States, 1980-1985.

ABSTRACT

Between 1980 and 1985, 89-121 international measles importations were reported annually in the US, accounting for 0.7-6.9% of the annual number of reported measles cases. These measles cases were acquired in more than 70 different countries. Three countries accounted for over one third of all imported cases Mexico, the UK and the Philippines. Thirty-six states reported importations. However, over half of all importations were reported from only six states California, New York, Maryland, Florida, Texas and Hawaii. Most measles importations did not cause transmission in the US. In 1982 and 1985 only 16% and 29% of importations resulted in any spread cases. Until there is better control of measles worldwide, high immunization levels are crucial for continued measles control in the US.