Previous COVID-19 or flu infection does not guarantee immunity; waning antibodies, viral evolution and weaker mucosal ...

When the immune system encounters a virus, it produces antibodies designed to recognize and eliminate the invader. But in ...

Many scientists around the world do not think herd immunity is achievable because the coronavirus will continue to mutate, escape the protection of vaccines and infect people, Mr Ong said.

A new study analyzing the immune response to COVID-19 in a Catalan cohort of health workers sheds light on an important question: does it matter whether a person was first infected or first vaccinated ...

The immune system’s first encounter with a virus or vaccine establishes a “starting template” that shapes its response to new variants, a phenomenon often called immune imprinting. A new study shows ...

Children and young adults who were unvaccinated and infected with COVID-19 were at an increased risk of developing ...

Experts say COVID-19 should not be dismissed as just another seasonal flu. While widespread immunity has reduced the severity of infection, the virus continues to hospitalise and kill vulnerable ...

The Food and Drug Administration (FDA) approved new Covid-19 vaccines for 2026 with updated protection against the ...

Update on COVID-19 Related Immunity From Liability This article reviews recent appellate rulings on COVID-19 immunity for health care providers, emphasizing that immunity depends on proving that the ...