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Fig. 7 | BMC Infectious Diseases

Fig. 7

From: Epidemiological and genetic characterization of pH1N1 and H3N2 influenza viruses circulated in MENA region during 2009–2017

Fig. 7

Amino acid substitutions in the HA genes of (a) pH1N1 and (b) A(H3N2) viruses circulated during 2009–2017. Amino acid substitutions in the head domain of the HA protein are labeled in red and amino acid (AA) substitutions in the stem domain are displayed in blue. The black curve shows the number of positive samples as reported to FluNet (WHO) during the same period. The green arrows denote the introduction of a new vaccine strain

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