Communicable Diseases Intelligence 2020 - Report on ...

The increased circulation of the double deletion viruses in many countries led to the change of the B/Victoria vaccine component to B/Colorado/06/2017 (a HA double-deletion virus), which reacts well with ferret antisera raised to two-amino-acid HA deletion B/Victoria viruses, although B/Victoria viruses with no deletion or a three-amino-acid ... ................
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