Coronavirus variants

Despite the progress in vaccinating Americans, there's concern about the threat posed by COVID-19 variants. The White House is urging not to "let down our guard."

Much of the blame for Brazil's coronavirus disaster lies with Jair Bolsonaro, who has enabled a domestic tragedy that now threatens the world, says analyst Robert Muggah.

Scientists are spotting new coronavirus variants almost on a daily basis. So far public health experts are still most worried about three important ones.