A growing body of research shows that nutrition, sleep, exercise and a host of other lifestyle choices can help optimize the immune system. But they are no substitute for life-saving vaccines.

Natural killer cells manage wound healing, research shows. But accelerating that process also ups the risk of bacterial infection, the study also finds.

Medications to treat COVID-19 are in no way a substitute for the vaccine. But under the right circumstances, some show great promise for helping patients.

A new inhaled vaccine offers protection against several strains of bacteria that can cause pneumonia in hospital settings, a study with mice shows.

Mother koalas are transferring a deadly virus that causes immune depletion and cancer to their babies, a new study shows.

The discovery that COVID-19 vaccination elicits a response in people with weakened immune systems, even if not quite as strong a response, is encouraging news.

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

People with weakened immune systems are at a high risk of severe and prolonged COVID-19 infections. An extra vaccine dose can bolster protection.

"It is tragic that the exact vaccines that might help prevent EED don't work in children who have the disease," says Timothy Hand.