As the CDC monitors a rise in strep A cases, experts explain why testing positive for the flu can increase the risk of a secondary bacterial infection.

A recent study suggests that targeting multiple areas of the flu virus' proteins may be the key to creating a flu vaccine that offers long-term immunity.

Scientists in Georgia have developed a dissolvable microneedle patch that contains the flu vaccine. Here are photos of the patch, and what it looks like on the skin.

Flu: What you need to know Although seasonal influenza is usually considered a common nuisance, it can be dangerous. The new year may have just begun, but the 2018-2019 flu season is well underway.

The phase three study data clears the path forward for Moderna’s combination jab targeting Covid-19 and influenza.

Lab tests suggest a strain of the flu virus circulating this season may not be "well-recognized" by the flu vaccine.

The 1918 influenza pandemic killed 50 million people, and infected one-third of the world's population. These images show just how deadly it was.

Public health officials were surprised last year when the dominant strain of circulating flu mutated after the flu vaccine had been formulated. The current version looks like a better match.

All the latest breaking news on flu vaccine. Browse Newsweek archives of photos, videos and articles on flu vaccine.

Art What Can Images of the 1918 Influenza Pandemic Teach Us About COVID-19? Images from the National Archives Catalog show striking parallels to today’s crisis, from masks to emergency hospitals.

As flu rages, the Trump administration has pulled the plug on a Centers for Disease Control and Prevention flu immunization campaign that targeted high-risk groups, including pregnant women.