The R.1 variant has mutations that could help it bypass the protections given to people by receiving two doses of the vaccine.
This means it could make the variant better at evading those antibodies that are created by having the vaccine and in those who have already been infected.
R.1 also shares a mutation with other variants, namely C241U, NSP12: P323L and D614G. D614G causes increased infections while it is not known what effect the other two have. All three mutations have been detected in strains that superseded the original Wuhan strain.
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