Pandemiology watch (September 9-15, 2026)

Our latest report covers data from September 9-15, 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.

Published by:

PandemiX Center (Research Centre)

This is an image of an orange cell/virus.

By: PandemiX Center

Cyclospora

The multistate outbreak of Cyclospora infections linked to iceberg lettuce from central Mexico has been declared over, according to the US Food and Drug Administration on September 11, 2026. The outbreak was associated with 12,883 illnesses, 570 hospitalizations and two deaths.

Ebola

According to the INRB-UMIE BDBV on September 13, 2026, Epidemic Dashboard, the Bundibugyo Ebola outbreak in the Democratic Republic of the Congo has reached 7,258 confirmed cases and 3,510 confirmed deaths. A total of 1,726 patients have recovered.

Measles

US

As of September 11, 2026, the United States has reported 3,294 measles cases so far in 2026, according to the Center for Disease Control. In 2026, the age group 5-19 accounts for 45% of the cases (1,468), and children under 5 years account for 18% of the cases (592). Of the cases reported in 2026, 95% were unvaccinated or had an unknown vaccination status and 8% of the cases have been hospitalized (267). A total of 5,583 measles cases have been reported to date.

According to Cidrap on September 15, Pennsylvania has reported two additional measles-associated deaths, bringing the total number of deaths linked to the outbreak to four this year. The latest deaths include an 18-year-old from Mifflin County who died from a severe neurological complication of measles and a 40-year-old woman from Jefferson County. Both individuals were unvaccinated. Pennsylvania has reported 693 measles cases in 2026, the highest number of cases among US states.

Canada

According to the Public Health Agency of Canada on September 14, 2026, Canada has reported 1,119 measles cases (1,038 confirmed and 81 probable) in 2026 as of September 5. 61% of the cases occurred in children (676). Manitoba accounts for 61% of the cases (680), and Alberta accounts for 28% of the cases (311) reported so far in 2026. 86% of the cases reported in 2026 were unvaccinated (963), and 7% required hospitalization. A total of 6,542 measles cases and two deaths have been reported to date.

Influenza

H5N1

As of September 15, 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 September 9-15, 2026, there have been no significant updates on mpox outbreaks worldwide.