Wealthy countries keep buying way more doses than they need. New data shows just how much the stockpile of unused vaccine is growing.

The U.S. is entering an uneasy stretch of the pandemic. Despite progress, the delta surge is dragging on in certain regions. Can vaccines ward off a big surge over the holidays?

Years after agreeing to take part in research, families of children with congenital Zika syndrome are feeling abandoned.

Are vaccinated people who get COVID as likely to spread the infection as unvaccinated people? Scientists don't think so.

Scientists caution that as the planet warms, more Americans could be exposed to disfiguring varieties of the Leishmania parasite. Overtreatment can be a problem, too, experts warn.

Oxford-AstraZeneca promised its COVID-19 vaccine would be effective, cheap and available worldwide. Five months after its launch, the path forward has been anything but smooth.

African nations had been counting on Serum Institute of India for nearly all their COVID vaccines. Now the company says it won't be sending any more for months. And African officials are scrambling.

While natural infection does seem to provide some immunity, studies suggest that it is short term. Vaccination, on the other hand, provides more robust immunity.

A previously unknown novel coronavirus capable of infecting people has been discovered in Borneo, says a team of researchers from Duke University.

President Biden said the U.S. is distributing them not to curry favor with allies, but to end the pandemic everywhere. And he's doing it through COVAX.

The short answer is — no. Immunology experts say there is little to be gained, for now, from an antibody test, for a number of reasons.

Doctors say India's battle with COVID-19 has led to an unprecedented rise in mucormycosis, a rare but dangerous fungal infection that preys on people with weakened immune systems.

A coronavirus variant is spreading quickly in India, causing a massive surge in cases. Scientists are rushing to see if vaccines will be effective against this variant. So far, the news is hopeful.

When Maji Hailemariam and her dad got sick with COVID in Ethiopia, she was frustrated by how difficult it was to get tested and treated. She urges governments that it doesn't have to be that way.

Aziz Abdul Alim, from a remote part of northern Pakistan, urges people to get their COVID shot: 'Everyone should have the courage to take it.'