Could this new malaria vaccine save millions of lives?

Scientists spent decades working towards a vaccine, and now the World Health Organization has approved the first.

With close to half a million deaths from malaria in 2019 – most in sub-Saharan Africa – scientists have spent decades working towards a vaccine, and last week, the World Health Organization approved the first.

But, with only 30 to 40 percent efficacy, some are also asking, is it worth it? And, there are other questions about how quickly it can be deployed.