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A new variant of Covid-19 detected in South Africa known as B.1.1.529 has caused flight bans and a scramble to determine vaccine efficacy, but will it overtake delta as the dominant strain of the virus?
The British coronavirus variant has increased transmissibility, but other mutations are provoking concern among scientists who are scrambling to work out if they will still respond to vaccines.
Coronavirus transmission from minks to humans does not necessarily mean the disease will become more dangerous, but scientists are closely monitoring the situation in Denmark