The varicella-zoster virus causes both chickenpox and shingles infections. Initially, the virus causes a chickenpox infection. If it reactivates later, shingles can develop. The chickenpox vaccine ...

A rare but serious clotting disorder linked to certain COVID-19 vaccines and natural adenovirus infections has puzzled scientists for years.

Scientists say they have identified a mutated autoantibody gene as the mechanism behind rare but serious abnormal blood ...

Salmonella enterica serovar Paratyphi A is responsible for more than 2 million cases of enteric fever annually, and there are no licensed vaccines. In a randomized trial, a live attenuated vaccine had ...

We are now approaching six years since COVID-19 was declared a pandemic by the World Health Organization, yet talk of ...

Children and adolescents had higher risks of vascular and inflammatory diseases after a first COVID diagnosis, as well as a higher risk of rare myocarditis or pericarditis after a first COVID vaccine.

The hepatitis B vaccine has emerged as the latest flashpoint as Health Secretary Robert F. Kennedy Jr. continues to cast doubt on the safety of vaccines. The vaccine is routinely given to babies ...

A new study shows children and young people face long-lasting and higher risks of rare heart and inflammatory complications after COVID-19 infection, compared to before or without an infection.

A large population-based study from the British Columbia Centre for Disease Control suggests that COVID-19 infection is associated with an increased risk of type 2 diabetes in unvaccinated and ...