Communicable Diseases Intelligence 2020 - Report on ...

However, B/Victoria viruses bearing a two or three amino acid (double or triple) deletion in the HA protein at positions 162–163 or 162–164 respectively have been increasing in frequency in many countries.20 Of the 59 B/Victoria viruses received at the Centre during 2018 that were sequenced, we found 14 viruses bearing the double HA ... ................
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