WHO Says Flu Shots Continue to Protect People Against Hospital Attendance

The World Health Organization (WHO) today published a Disease Outbreak News (586) titled "Seasonal influenza Global situation." In the Northern Hemisphere, influenza activity has increased since October 2025, with influenza A viruses predominant among the viruses detected globally.

As of December 10, 2025, the WHO stated that early estimates suggest the influenza vaccine continues to protect against hospital attendance in both children and adults. However, its effectiveness against clinical disease during the current season remains uncertain.

The WHO added that even if there are some genetic differences between the circulating influenza viruses and the strains included in the vaccines, the seasonal influenza vaccine may still protect against drifted viruses and the other virus strains included in the vaccine.

Vaccination is still expected to protect against severe illness and remains one of the most effective public health measures. WHO continues to monitor global influenza activity and influenza viruses, supports countries in surveillance capacity, and updates guidance as needed.

The WHO and U.S. CDC say vaccinations remain essential for international travelers, especially for people at high risk of influenza complications and their caregivers.

In the United States, recent reports have identified states such as Louisiana that have seen upticks in flu-related cases.