“…For example, the earliest Hong Kong H3N2 strain, A/HK/1968(H3N2), had two pNGSs (81 and 165), while strains sampled later gained 10–11 and 8 pNGSs in their H3 and N2 proteins, respectively [ 15 , 16 , 119 ]. We observed several substitutions resulting in gain (S45N, S124N, A128T, K144N, F159Y, K160T, N225D) and loss (L3I, N144S) of pNGS among Africa H3N2 strains [ 67 , 78 , 79 , 80 , 81 , 93 , 95 , 96 , 97 , 101 ], similar to global strains [ 15 ]. The HA receptor-binding sites among African IAV strains mostly remained conserved [ 73 , 74 , 81 ].…”