Study findings suggest people with chronic liver disease should be prioritized for booster shots.

The findings provide a basis for future studies of the immune system’s role in longevity.

People 65 and older and immunocompromised people can get a second bivalent booster; most unvaccinated people now need only one initial shot.

Experimental flu vaccine, designed to elicit immunity against a broad range of influenza viruses, performed well in a small trial.

A second meta-analysis found that people with cirrhosis had higher COVID mortality.

Current vaccines are effective for preventing severe disease, but a nasal vaccine could potentially prevent infection and transmission.

Herpes, HIV, Epstein-Barr and other viruses hang around, causing potential long-term health woes. Should long COVID surprise us?

Moderna and Merck’s personalized neoantigen vaccine plus checkpoint inhibitor lowered the risk of disease progression after surgery by 44%.

The reduction in COVID-19 cases and deaths was strongest in the period before vaccines became widely available.

Study findings support the continuation of telehealth services for opioid use disorder and related care.