The South African Coronavirus variant looks nasty

I'm not really clear if the efficacy rate corresponds to the new mutations or is describing the original Covid virus.

Novavax, which makes one of six vaccine candidates supported by Operation Warp Speed last summer, has been running trials in Britain, South Africa, the United States and Mexico. It said Thursday that an early analysis of its 15,000-person trial in Britain revealed that the two-dose vaccine had an efficacy rate of nearly 90 percent there. But in a small trial in South Africa, the efficacy rate dropped to just under 50 percent.

NYT, Novavax’s Vaccine Works Well — Except on Variant First Found in South Africa