South Africa suspends Astrazeneca covid vaccine.

https://www.dw.com/en/south-africa-suspends-rollout-of-oxford-astrazeneca-coronavirus-vaccine/a-56491411

Astrazeneca's vaccine is found to be ineffective against B1351 variant in South Africa (SA).  Therefore, SA suspends Astrazeneca's vaccine.

This variant will become the dominant virus in the US by March 2021.

http://sg-stock.blogspot.com/2021/01/current-vaccinations-maybe-ineffective_29.html