AstraZeneca's (AZN) - Get Report vaccine candidate--which has been approved in countries such as the United Kingdom and South Africa, but has not been approved in the U.S.-- has been shown to be not as effective against the South African variant according to a study.
In response, South Africa has halted the rollout of AstraZeneca's COVID-19 vaccine.
But what does this mean for the overall vaccine rollout and how could it impact investors?
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