The immune system’s first encounter with a virus or vaccine establishes a “starting template” that shapes its response to new ...

Immunity acquired from a Covid infection provides strong, lasting protection against the most severe outcomes of the illness, according to research published Thursday in The Lancet — protection, ...

The protection conferred by natural immunity, vaccination, and both against symptomatic severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection with the BA.1 or BA.2 sublineages of the ...

Vaccination is the most powerful and effective tool in modern medicine against infectious diseases. By triggering the body's immune system, vaccines prevent disease and its complications and save ...

Vaccines today are more efficient and contain far fewer stimulants to the immune system than some used decades ago. By Apoorva Mandavilli It’s an idea as popular as it is incorrect: American babies ...