How many Americans consider themselves "anti-vaxxers"? A new survey finds that a "surprising" number of people sometimes or always identify with the label.

A new rapid blood test could confirm if a person has received a COVID-19 vaccine while they wait to board a plane or enter a sporting event.

Researchers have found antibody-producing cells in people who had COVID-19 11 months after recovery. The work suggests the antibodies may last a lifetime.

A new experimental nanoparticle-based vaccine that has proven effective for flu, is also being tested for COVID-19 and studied as an HIV vaccine.

Researchers are investigating why COVID-19 vaccines that use nanoparticles appear to be more effective for men than women.

A post-COVID vaccination "return to normal"—gathering in groups, going to work, and dining out—has some people anxious. Here's why and how to ease the move.

Child vaccination rates dropped sharply during the pandemic, with the greatest declines among 5- and 16-month-old babies, research from Texas shows.

The rare blood clots some people experienced after receiving the Johnson & Johnson vaccine is more likely after COVID-19 infection, experts report.

A nose spray vaccine enhances the body's immune response to flu infection and offers broad protection against different strains, research with mice shows.

People infected with COVID-19 during pregnancy have increased risk of premature birth, pre-eclampsia, admission to intensive care, and even death.