How sure can we be that the Delta variant is the last mutation?
As more and more people are vaccinated against Covid-19, there are fears that the disease could mutate to evade the jab.
As more and more people are vaccinated against Covid-19, there are fears that the disease could mutate to evade the jab.
The World Health Organization (WHO) has described dengue fever as one of the top 10 threats to global health.
On Thursday, skygazers in the UK will be able to see nearly a third of the sun being blocked out by the moon in what is known as an annular eclipse.