Atlanta, GA–As of 3 p.m. today, April 24, 2019, CDC is reporting 695 cases of measles from 22 states. This is the greatest number of cases reported in the United States since measles was eliminated from this country in 2000.
The high number of cases in 2019 is primarily the result of a few large outbreaks – one in Washington State and two large outbreaks in New York that started in late 2018. The outbreaks in New York City and New York State are among the largest and longest lasting since measles elimination in 2000. The longer these outbreaks continue, the greater the chance measles will again get a sustained foothold in the United States.
The recent outbreaks started through importation. Measles is imported when an unvaccinated traveler visits a country where there is widespread measles transmission, gets infected with measles, and returns to the United States and exposes people in a community who are not vaccinated. When measles is imported into a community with a highly vaccinated population, outbreaks either don’t happen or are usually small. However, once measles is in an under-vaccinated community, it becomes difficult to control the spread of the disease.
The World Health Organization reported this month that there has been a 300% increase in the number of measles cases worldwide compared with the first 3 months of 2018. That increase is part of a global trend seen over the past few years as other countries struggle with declining vaccination rates and may be exacerbating the situation here.
A significant factor contributing to the outbreaks in New York is misinformation in the communities about the safety of the measles/mumps/rubella vaccine. Some organizations are deliberately targeting these communities with inaccurate and misleading information about vaccines. CDC continues to encourage parents to speak to their family’s healthcare provider about the importance of vaccination. CDC also encourages local leaders to provide accurate, scientific-based information to counter misinformation.
CDC will release the next round of new numbers of measles cases on Monday, April 29, as part of efforts during National Infant Immunization Week (NIIW) to emphasize the life-saving benefits of childhood immunization.