Table 1. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concerns, as for February 23, 2021.

Variant	Emergence	New mutations	R0
Wild Type	China	–	3.14
B.1.1.7	UK	T1001I, A1708D, I2230T, SGF 3675–3677 (deletion), HV 69-70 (deletion), Y144 (deletion), N501Y, A570D, P681H, T716I, S982A, D1118H, Q27stop, R52I, Y73C, D3L, S235F	4.90
B.1.351	South Africa	T265I, K1655N, H2799Y, S2900L, K3353R, D4527Y, P4715L, T5912I, L18F, D80A, D215G, R246I, K417N, E484K, N501Y, D614G, A701V, Q57H, S171L, P71L, T205I	4.71
P1 (B.1.1.28.1)	Brazil	T733C, C2749T, S1188L, K1795Q, 11288-11296 (deletion), C12778T, C13860T, E5665D, L18F, T20N, P26S, D138Y, R190S, K417T, E484K, N501Y, H 655Y, T1027I, E92K, 28269-28273 (insertion), P80R	4.70–4.90

Biologically significant mutations are evidenced in bold. R0, basic reproduction number.