https://www.nytimes.com/2021/05/12/busi … Position=1
This is disturbing news which may indicate that the Chinese vaccine may not be efficacious against the South African variant. I don't have a citation, but I think I have read (maybe here) that the Sinopharm vaccine is being considered for use in Vietnam. Pfizer and Moderna appear to work against all known variants but there may be problems with availability. There is however building political pressure in the US for these companies to give up some of their intellectual property rights so that their vaccines could be manufactured in India or maybe even Vietnam.