When the coronavirus copies itself, there is a chance its RNA will mutate. But new variants must jump from one host to another, and the more infections there are, the better chance this will happen.

A critical care doctor brings a frontlines perspective to the frustration of dealing firsthand with vaccine hesitancy and discusses the limitations of science and medicine.

Although stretched thin and imperfect, health care workers do our best for everyone who needs us, regardless of the personal choices people have made.

An infectious disease doctor explains the science behind COVID-19 vaccines at a level that children – and adults – of all ages can understand.

It has been six months since the Johnson & Johnson vaccine received emergency use authorization. What does six months of data show about its efficacy, side effects and protection from variants?

A 2015 paper on chicken virus evolution is being taken out of context and used to fuel fears about COVID-19 vaccines. Its lead author aims to clarify the science in hopes of saving lives.

A COVID-19 vaccine does not cause infertility – but it can protect you from the dangerous complications of contracting the virus.

Each dose of Pfizer has a long and complex path involving mixing, storage at temperatures colder than the South Pole and specific protocols that must be followed before it becomes a jab.

Each dose of Pfizer vaccine has a long and complex path involving mixing, storage at temperatures colder than the South Pole and specific protocols that must be followed before it becomes a jab.

After enduring a devastating wave of infections, deaths and lockdowns at the start of the pandemic, Italy is putting in place tougher anti-COVID measures, including a vaccine passport.