CDC Changes Measles Mortality Tracking Method, Reporting Zero Deaths for 2026 Amid Pennsylvania Outbreak

The Centers for Disease Control and Prevention (CDC) has changed its methodology for counting measles fatalities, resulting in an official federal tally of zero deaths for 2026. The agency announced on September 4 that it will now rely on the National Center for Health Statistics (NCHS) to identify measles as an underlying cause of death, rather than drawing from the National Notifiable Diseases Surveillance System (NNDSS) that routes real-time case data from state and local jurisdictions.[1][4]

The shift occurs as Pennsylvania battles one of the largest measles outbreaks in recent history, with the state recording 676 confirmed cases as of mid-September. During this outbreak, Pennsylvania health officials and local coroners have reported at least three measles-associated deaths, including a newborn, a six-week-old infant, and a 40-year-old woman.[1][5]

Under the new reporting framework, the CDC's measles dashboard features an asterisk in place of a death count. A corresponding footnote states that the NCHS "does not currently have any death records from 2026 that indicate measles is the underlying cause." Emily Hilliard, a spokesperson for the U.S. Department of Health and Human Services (HHS), confirmed that the CDC will only report measles deaths if and when the NCHS officially designates the virus as the underlying cause.[1][2]

Public health experts have questioned the timing and utility of the change. Debra Houry, a former CDC chief medical officer, described the move as "puzzling," noting that the NCHS system is "usually focused on high-quality, long-term mortality trend analysis" rather than confirming individual cases during an active outbreak. During previous outbreaks in Texas and New Mexico in 2025, the CDC included state-reported deaths in its national tally while investigations were still ongoing.[1][4]

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The methodological shift follows public friction between federal and state officials over the classification of the Pennsylvania fatalities. In late August, Health and Human Services Secretary Robert F. Kennedy Jr. publicly questioned whether the infant deaths in Lancaster County were genuinely caused by measles, suggesting the reports might have been fabricated.[1][5]

Local authorities have pushed back against the federal skepticism. Stephen Diamantoni, the Lancaster County coroner, confirmed to medical journals that the August 18 death of a six-week-old girl with Amish lethal microcephaly was "caused by measles." Diamantoni noted that while the child had a compromised state, respiratory infections driven by the virus were the deciding factor.[5]

Over the weekend, Jefferson County Coroner Greg Furlong announced the state's third probable measles-related death: an unvaccinated 40-year-old woman who required round-the-clock oxygen for chronic obstructive pulmonary disease. Furlong stated that the woman exhibited a characteristic measles rash and had a confirmed epidemiological link to a positive case, adding that she would not have died without the measles infection despite her underlying conditions.[1]

The discrepancy between state and federal reporting has drawn scrutiny from lawmakers. Democratic leaders on the House Energy and Commerce Committee demanded a briefing from CDC Director Erica Schwartz, characterizing the data shift as an attempt to conceal public health information.[1]

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The Pennsylvania outbreak accounts for a significant portion of the 3,134 measles cases reported nationwide in 2026, a figure that has already surpassed the 2,289 cases recorded in 2025. The national surge coincides with declining vaccination rates; the CDC reports that MMR vaccine coverage among U.S. kindergarteners fell to 92.4% in the 2025-2026 school year, well below the 95% threshold required for community immunity.[2][5]

As local health departments continue to manage the outbreak, the federal death count remains at zero. The CDC has stated it is working with the Council of State and Territorial Epidemiologists to develop a standardized case definition for deaths due to measles, a process intended to promote consistent classification across jurisdictions. Until that review is complete, state-confirmed fatalities will not appear in the national mortality statistics.[1][2]