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MIAMI, FL - JUNE 02: India Ampah holds her son, Keon Lockhart, 12 months old, as pediatrician Amanda Porro M.D. administers a measles vaccination during a visit to the Miami Children's Hospital on June 02, 2014 in Miami, Florida. The Centers for Disease Control and Prevention last week announced that in the United States they are seeing the most measles cases in 20 years as they warned clinicians, parents and others to watch for and get vaccinated against the potentially deadly virus. (Photo by Joe Raedle/Getty Images)
MIAMI, FL - JUNE 02: India Ampah holds her son, Keon Lockhart, 12 months old, as pediatrician Amanda Porro M.D. administers a measles vaccination during a visit to the Miami Children's Hospital on June 02, 2014 in Miami, Florida. The Centers for Disease Control and Prevention last week announced that in the United States they are seeing the most measles cases in 20 years as they warned clinicians, parents and others to watch for and get vaccinated against the potentially deadly virus. (Photo by Joe Raedle/Getty Images)

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Doctor: Vaccinations promote good health

CNN's Anderson Cooper speaks to a doctor and a father whose child, who was diagnosed with leukemia, was exposed to the measles.

Doctor: Vaccinations promote good health

CNN's Anderson Cooper speaks to a doctor and a father whose child, who was diagnosed with leukemia, was exposed to the measles.