The highest antibody levels were seen among those who were school-aged children during the 2009 H1N1 flu pandemic.

As the South Carolina measles outbreak approaches 800 cases, states across the nation are tracking their first measles cases of 2026.

Highly pathogenic avian influenza A(H5N1) viruses have been circulating among wild birds and are enzootic in poultry in some areas of the world with spillover to a wide range of terrestrial and marine ...

People protest against Federal immigration agents on Friday, Jan. 23, 2026, in Minneapolis.