First H3N2 Subclade K Flu Case Confirmed in Mexico

The Ministry of Health confirmed on Friday the first case in the country of the influenza A H3N2 subclade K virus, identified by the National Institute of Respiratory Diseases (INER).

According to the agency, the patient received outpatient treatment with antivirals and is now completely recovered.

The finding is part of the permanent monitoring conducted by the National Epidemiological Surveillance System (SINAVE), which allows for timely detection of any possible cases of new variants or subclades of respiratory viruses.

Key Information About Influenza A H3N2 Subclade K

Through an official statement published on social media, the health authority detailed that this variant presents characteristics similar to seasonal influenza that circulates each year, so its clinical management does not change and vaccination continues to be the main prevention tool.

Therefore, it insisted that the announcement does not represent a cause for alarm for the population.

“The Ministry of Health reports” – SALUD Mexico (@SSalud_mx) December 12, 2025

Recommendations: What Should I Do?

The Ministry of Health called on citizens to go to medical centers and units to receive the corresponding vaccines for the winter season, especially against influenza, COVID-19 and pneumococcus, according to the schedule that applies to them. These biologicals are fundamental to reduce risks, prevent complications and avoid hospitalizations, especially in children, older adults, pregnant women, healthcare personnel and people with comorbidities.

Likewise, if a person tests positive for influenza, it is recommended to seek early medical attention, use face masks and maintain isolation measures when necessary, in addition to receiving standard antiviral treatment.

The agency reiterated that it maintains active epidemiological surveillance and will inform in a timely, clear and transparent manner any relevant updates about virus circulation.

With information from the Ministry of Health.