There are several factors driving the spread of the highly infectious virus, experts said.

Many cases reported in the United States this year were linked to international travel, according to the C.D.C., as travel destinations such as Britain, Austria and the Philippines have had outbreaks. Many of the people in the United States who have been infected have been unvaccinated children age 12 months and older.

  • RBG
    23·
    9 months ago

    Just wait for Polio to come back. Maybe then people will remember how important these basic vaccines are. Effects will be horrifying but that seems necessary for people that don’t vaccinate their children.