As mentioned in my accompanying post, measles is on the rise in the U.S. and Europe. Many people don’t understand why is it on the rise in the U.S. One misconception is that refugees are a common source of measles. In fact, most outbreaks are from U.S. travelers going abroad. One study supporting this noted that there are 10 times more annual U.S. visitors to high measles incidence countries than there are unauthorized immigrants from them. Except for Venezuela and now Brazil, Latin America has measles very well controlled. Refugees also receive immunizations before resettlement here. Depending on age and risk factors, these include polio; measles, mumps, and rubella; hepatitis B; pneumococcal conjugate; and Haemophilus influenzae type B vaccines.