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Pandemiology Watch (April 22-28, 2026)

Our latest report covers data from April 22-28, 2026. This update provides an overview of communicable diseases, highlighting key trends, emerging outbreaks, and notable developments. We have included direct links to the sources referenced, allowing for deeper insight.
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    Measles

    US

    As of April 24, 2026, the United States has reported 1,792 measles cases so far in 2026, according to the Center for Disease Control. In 2026, the age group 5-19 accounts for 51% of the cases (917), and children under 5 years account for 21% of the cases (385). Of the cases reported in 2026, 92% were unvaccinated or had an unknown vaccination status and 6% of the cases have been hospitalized (10½). A total of 4,080 measles cases and three deaths have been reported to date. 

    According to CIDRAP on April 27, 2026, a major measles outbreak in South Carolina has officially ended after 42 days without new cases. The outbreak, which began in October 2025, led to 997 infections, mainly among unvaccinated children and adolescents. Despite this, measles activity across the United States remains elevated. In its latest update, Utah reported five additional cases, bringing its 2026 total to 410, while Arizona recorded seven new cases, raising its total to 85. Health officials note that most cases are still linked to ongoing outbreaks and emphasize that low vaccination coverage continues to contribute to transmission.

    Canada

    As of April 27, 2026, Canada has reported 907 measles cases in 2026, according to the Public Health Agency of Canada. In 2026, 61% of the cases occurred in children (541). Manitoba accounts for 60% of the cases (556), and Alberta accounts for 31% of the cases (281) reported so far in 2026. 88% of the cases reported in 2026 were unvaccinated (801), and 7% required hospitalization. A total of 6,332 measles cases and two deaths have been reported to date.

     

    Influenza

    According to the Centers for Disease Control and Prevention on April 24, 2026, 149 pediatric influenza deaths have been reported in the United States during the 2025-2026 flu season. In the latest weekly influenza surveillance report, six additional child deaths linked to influenza were reported. 85% of the children who died were not fully vaccinated against influenza. 

    H5N1

    According to UC Davis Pandemic Insights, the latest update on the H5N1 marine outbreak shows continued spread among California marine mammals. As of April 23, 2026, a total of 48 northern elephant seals in San Mateo County, five in Santa Cruz County, and one in Monterey County have tested positive. The update refers to the same outbreak first identified in February 2026 at Año Nuevo State Park, where a small number of elephant seal pups tested positive for H5N1, the first detection of the virus in marine mammals in California.

    As of April 28, 2026, the Centers for Disease Control and Prevention has not reported any cases of person-to-person transmission of H5N1 in the United States. The total remains at 71 confirmed human cases and two deaths.

     

    Mpox

    From April 22-18, 2026, there have been no significant updates on mpox outbreaks worldwide.