Add Yahoo as a preferred source to see more of our stories on Google. Can certain infections, such as COVID, leave you more vulnerable to getting another illness? (Getty Images) (Guido Mieth via Getty ...

In a recent preprint* study posted to the medRxiv server, a team of researchers evaluated the impact of hybrid immunity (combining vaccination and recovery from infection) on severe acute respiratory ...

Feeling constantly tired and falling sick often? Know why chronic fatigue and frequent infections happen, what weakens ...

Aspergillus, a common airborne fungus, is inhaled daily by most people without harm. But for those with weak immunity or lung ...

Get it early, develop immunity, get back to work: some wonder As COVID-19 numbers climb precipitously, health care workers, first responders and the countless individuals working in "essential ...

Herd immunity occurs when enough people in a group are immune to a specific infection that it cannot spread easily from person to person. Vaccination programs have been successful in creating herd ...

As bird flu continues to circulate in animals and spill over into humans, researchers are racing to stop it before it adapts ...

Maternal diabetes mellitus is associated with significantly higher infection rates among infants during the first 6 months of life.

As scientists learn more about the virus, they say herd immunity won't work. Early in the pandemic, scientists and public health experts leaned on their experience with other viruses to make ...

Having a COVID-19 infection can shore up your immunity to the virus, but can it also leave you more susceptible to getting sick with other illnesses? That's the theory laid out in a new scientific ...