As of February 2008, the CDC noted that "fewer than 100 measles cases are now reported annually in the United States and virtually all of those are linked to imported cases". The USA maintains herd immunity for measles, even in states where it is easy to opt out of vaccination requirements. Occasionally a case comes in from overseas travel, but the impact is minimal and no one has died from measles in years.<ref> [http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5708a3.htm]</ref> | As of February 2008, the CDC noted that "fewer than 100 measles cases are now reported annually in the United States and virtually all of those are linked to imported cases". The USA maintains herd immunity for measles, even in states where it is easy to opt out of vaccination requirements. Occasionally a case comes in from overseas travel, but the impact is minimal and no one has died from measles in years.<ref> [http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5708a3.htm]</ref> |