We're likely to need coronavirus booster shots after the initial vaccine

Many leading coronavirus vaccines require two shots given weeks apart. But additional...

We now have the best evidence yet that Covid immunity lasts 6 to 8 months, perhaps even years

Experts have long focused on coronavirus antibodies to assess whether someone has...

How to interpret the 'vaccine efficacy' rates of coronavirus vaccines

Vaccine efficacy is a metric that measures how well cases of an infectious disease, like...

China's president pledged to work with other countries to accelerate Covid-19 vaccinations

Xi Jinping said China is "willing to strengthen coordination" internationally for vaccine...

Pfizer's Covid vaccine requires 2 shots, given 3 weeks apart, which could complicate distribution

Pfizer announced that its vaccine prevented Covid-19 in clinical trials. People will need...

Pfizer's Covid vaccine is 90% effective. Here's how that compares to shots for flu, measles and more

Pfizer announced that its vaccine prevented COVID-19 in clinical trials. Here's how its...

Facebook is now banning any ads that 'discourage people from getting a vaccine'

There appears to be an exemption for political ads on Facebook that advocate against...

64% of South Africans would take a Covid-19 vaccine - 3 charts show what people around the world think

Even if a vaccine does become available, people must be willing to get the shot for the...