Pandemiology Watch (November 12-18, 2025)
Emerging outbreaks
On November 14, Ethiopia confirmed its first Marburg virus outbreak, with nine cases detected in the South Omo zone, according to the World Health Organization (WHO). Three deaths have been reported. WHO is supporting the response with technical teams, supplies, and strengthened surveillance. There is no approved vaccine or specific treatment for Marburg.
MEASLES
U.S.
Measles cases continue to rise in Arizona, Utah, and South Carolina, CIDRAP reported on November 12. Arizona now has 128 cases, Utah has 74, and South Carolina has 46, including two infections with no known source.
As of November 13, 2025, Center for Disease Control reports a total of 1,723 confirmed measles cases in the U.S. in 2025. 12 % of cases have required hospitalization (206 cases of 1,723), and three deaths have been reported.
Canada.
As of November 17, 2025, Canada has reported 5,208 measles cases where 71% occurred in children, according to the Public Health Agency of Canada. Ontario accounts for 46% of the cases, followed by Alberta with 38%. 89% were unvaccinated, and 7% required hospitalization. Genotype D8 remains the most frequently detected strain. 2 deaths have been reported.
Rift Valley Fever
Senegal.
As of November 17, the Africa Centres for Disease Control and Prevention (Africa CDC) reported a total of 6,132 suspected Rift Valley Fever cases in Senegal, including 3,021 new cases since the last update on October 27. The number of confirmed cases has risen to 391 (40 new), with 29 deaths (1 new). Of the cases reported, 67% were males, 18% aged 20-25, and 87% occurred in the Saint Louis region.
Mauritania.
As of November 17, Africa CDC reported a total of 218 suspected Rift Valley Fever cases in Mauritania, including 29 new suspected cases since the last update on October 27. The number of confirmed cases has risen to 52(4 new), with 15 deaths and no new case since the last update. Of the cases reported, 77% were male, and 94% were in individuals over 10 years old.
MPOX
Africa.
Sierra Leone: The World Health Organization (WHO) reported 5,442 confirmed mpox cases as of October 26, and no new data have been released in the past week.