Europe lists four approved vaccines for travelers. There's an omission that makes Nigerian physician Ifeanyi Nsofor feel invisible — and disappointed.

As of late May, 50.6% of Canada's population had received at least one vaccination shot — but only 4.6% of the population was fully vaccinated.

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.

The Danish Health Authority said it will continue its vaccination campaign without the shot made by AstraZeneca, but said its benefits outweigh the risks for those who do get it.

One of the hottest areas of research right now: studies to determine how well current vaccines work against emerging coronavirus "variants of concern."

The European Medicines Agency said Wednesday that blood clots should be listed as a possible but rare side effect of the AstraZeneca COVID-19 vaccine, stressing the shot's benefits outweigh the risks.

Some Mexicans with family ties or dual citizenship in the U.S., or who can afford the airfare, head north of the border to get vaccinated faster than the months of waiting for one back home.

The German chancellor announces an intensified coronavirus lockdown going into Easter, warning that new mutations raise the specter of a potentially deadly "third wave" of COVID-19.

In an unusual post-midnight statement, the National Institute of Allergy and Infectious Diseases said AstraZeneca might have used old data for its COVID-19 vaccine trial.

The United States will loan millions of doses of the AstraZeneca vaccine — not yet approved for emergency U.S. use — to its closest neighbors.

NPR tours the factory of the world's largest vaccine maker: Serum Institute of India. It's manufacturing nearly 100 million doses a month of the Oxford-AstraZeneca formula and exporting them globally.

"Its benefits continue to be far greater than its risks," said Dr. Sabine Straus of the agency's risk committee. It found no increase in the overall risk of blood clots with the vaccine.

Several other countries including France, Germany, the Netherlands and Ireland moved to suspend injections of the vaccine this week.

The two countries joined a number of other European nations that have temporarily suspended the shot after several people reportedly developed blood clots after receiving it.

The Prime Minister of Trinidad and Tobago gave an impassioned speech about the vaccine rollout, warning of hoarding and price gouging. Here's what we could find out about the cost of a dose.