Measles cases in the United States have surged past 900, with outbreaks spreading across the country, according to recent data from the Centers for Disease Control and Prevention (CDC). As of now, 935 confirmed cases have been reported in 29 states, including Alaska, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Montana, New Jersey, New Mexico, New York, Ohio, Oklahoma, Pennsylvania, Rhode Island, Tennessee, Texas, Vermont, Virginia, and Washington. Notably, six states, namely Indiana, Kansas, Michigan, New Mexico, Ohio, and Texas, have identified outbreaks, defined as three or more related cases.
The CDC reports that 13% of measles patients in the U.S. this year required hospitalization, with most of these individuals being under the age of 19. Alarmingly, approximately 96% of the confirmed cases involve people who are either unvaccinated or have an unknown vaccination status. Only 2% of cases are among those who have received a single dose of the measles, mumps, and rubella (MMR) vaccine, and another 2% are among individuals who have completed the recommended two-dose regimen.
Dr. Conrad Fischer, the chief of infectious diseases at One Brooklyn Health in New York City, expressed his concern over the escalating number of cases in the country. He emphasized that measles was once nearly eradicated due to a robust vaccination program. However, the recent resurgence highlights a concerning lapse in societal awareness of the seriousness of measles and the vital role of vaccination, which has been proven safe and effective for billions globally.
Before the introduction of the measles vaccine, the CDC estimates that 3 to 4 million Americans contracted measles annually, resulting in approximately 48,000 hospitalizations and 400 to 500 deaths each year. Additionally, around 1,000 individuals experienced encephalitis, a severe condition involving brain swelling. Measles was officially declared eliminated in the U.S. in 2000, but recent declines in vaccination rates have led to a troubling increase in cases.
Texas is particularly affected, with an outbreak in the western part of the state resulting in at least 663 confirmed cases. Recently, Denton County in eastern Texas reported its first case involving an adult with an unknown vaccination status who had attended a Texas Rangers game. In Chicago, the first measles cases were reported this week, one involving a suburban Cook County resident of unknown vaccination status and another in a Chicago adult with one vaccine dose and a history of international travel.
The World Health Organization (WHO) recently reported that measles cases in the Americas have increased elevenfold compared to the same period last year. Six countries, including the U.S., Canada, Mexico, Argentina, Belize, and Brazil, have collectively reported 2,318 cases so far this year, significantly higher than last year's 205 cases.
Dr. Fischer warns that measles is not a benign disease and can lead to severe complications, particularly in vulnerable groups such as young children and the immunocompromised. Measles is the most contagious infectious disease known, with an unvaccinated individual having a 90% chance of infection when exposed.
Dr. Whitney Harrington from Seattle Children's Hospital emphasizes the risk of measles becoming endemic again if vaccination rates do not improve. She stresses that vaccines are a critical public health tool in preventing infectious diseases and encourages parents to consult healthcare providers about the benefits of vaccination. The CDC recommends two doses of the MMR vaccine, with the first dose administered between 12 to 15 months of age and the second between 4 to 6 years old, providing 93% and 97% effectiveness, respectively.