In brief
In 2026 the CDC announced 5,182 measles cases, a spike not seen since 1991. Children and teenagers account for nearly 60% of infections, amid falling kindergarten vaccination rates. The federal death count of four is lower than state reports, sparking a dispute in Pennsylvania over how measles deaths are classified.
On March 18, 2026 the Centers for Disease Control and Prevention published a data release that listed 5,182 confirmed measles infections in the United States, the highest tally recorded in 35 years, according to a report by Al Jazeera. The figure was also echoed by Reuters, which noted the same total in a news brief the same day.
Age‑related information in the CDC’s report shows that children under five years old account for 18 percent of cases, while those between five and 19 years old make up 41 per cent, bringing the total for children and teenagers to about 59 percent of all confirmed cases. The data also indicate that 4,993 of the infections are outbreak‑associated, suggesting that the epidemic looks to be growing beyond isolated incidents.
The CDC’s analysis cites a decline in vaccination coverage among U.S. kindergarteners, describing a fall from 95.2 percent in the 2019‑2020 school year to 92.4 percent in 2025‑2026. The drop in vaccine uptake has been highlighted as a key driver of the current surge in measles, according to the CDC and the reporting by Al Jazeera.
The death toll reported for this year by the CDC is four, a number that is lower than the figure reported by state officials. In 2026 the United States Department of Health reported four measles‑related deaths, but Pennsylvania’s Department of Health recorded six deaths and 1,487 cases for the same year. The discrepancy has become a point of contention between state and federal authorities.
In a dispute over classification, Pennsylvania’s approach counts an individual as a measles‑associated death if the person dies within 30 days of developing symptoms, unless death is due to an unrelated cause. According to the state, two unvaccinated residents died directly of measles in August. The CDC initially included those deaths in its national tally but later removed them following a challenge from Health Secretary Robert F. Kennedy Jr., who questioned whether the deaths met the agency’s definition of measles deaths. Governor Josh Shapiro of Pennsylvania has publicly criticized the federal classification, calling the removal of deaths from the national count “an erosion of public confidence.”
Although the CDC’s data have highlighted a sharp rise in measles cases and a concerning shift in the age profile of the infected, the outbreak’s origins remain unclear. Public health experts point to the reduced interstate vaccination rates as a chief conduit for the disease’s spread, but no single cause has been definitively identified according to the sources citing the CDC’s release and subsequent analyses.
What remains uncertain, as noted by all the reporting outlets, is the true number of deaths attributable to measles, the specific mechanisms behind the recent decline in vaccination rates, and whether the current outbreak poses an imminent threat beyond the reported 5,182 cases.
