Yucatán Posts More Than Half of Mexico’s New Influenza Cases

Mérida, Yucatán — Yucatán accounted for more than half of all new confirmed influenza cases in Mexico during the latest epidemiological week, according to federal health data. The state’s cases rose from 104 to 125, a 20.2% increase, keeping Yucatán in first place nationally during the 2026 inter-seasonal period.

The Health Department’s weekly surveillance report shows Mexico overall went from 401 to 440 confirmed cases between epidemiological weeks 31 and 32, a net increase of 39. Of those new cases, 21 were in Yucatán, representing 53.8% of all new national confirmations.

That means more than one in every two new infections added to the national registry during the week came from Yucatán.

Yucatán also grew at twice the national pace. While Mexico’s weekly increase was 9.7%, Yucatán’s was 20.2%.

According to the report, Yucatán now accounts for 28.4% of the country’s 440 cumulative cases. Quintana Roo follows with 13.2%, approximately 58 cases. Together with Mexico City, Tabasco, and San Luis Potosí, these states represent 59.5% of all confirmed infections nationwide, showing a notable concentration in the southeast during a period that typically receives less attention than the winter season.

In Yucatán, health officials studied 1,281 patients who met the case definitions for influenza-like illness or severe acute respiratory infection. Of those, 125 tested positive, a 9.8% positivity rate. The 1,281 suspected cases are not confirmed infections; only the positive test results count as influenza cases.

The report identifies influenza type B as the predominant strain among Yucatán patients. However, public data does not break down the results by municipality, hospitalization status, or vaccination history. There is no evidence yet to suggest a localized outbreak in a school, workplace, or specific municipality; the available data only shows an increase in detections by the surveillance network.

Despite the uptick, Yucatán has reported no confirmed influenza deaths during the inter-seasonal period. Nationwide, Mexico has recorded ten deaths: two in Quintana Roo and one each in Campeche, Chiapas, Colima, Hidalgo, Sinaloa, Tabasco, Tlaxcala, and Veracruz. The Yucatán Peninsula thus accounts for three deaths: two in Quintana Roo and one in Campeche.

Health authorities said the coming weeks will determine whether the increase in Yucatán is a temporary concentration of diagnoses or the start of a sustained upward trend. More detailed data on the new patients’ ages, municipalities, hospitalizations, and vaccination histories would help clarify the situation.