It has added BA.4 and BA.5, sister variants of the original BA.1 Omicron variant, to its list for monitoring. It is already tracking BA.1 and BA.2 — now globally dominant — as well as BA.1.1 and BA.3.
Viruses mutate all the time but only some mutations affect their ability to spread or evade prior immunity from vaccination or infection, or the severity of disease they cause. Only a few dozen cases of BA.4 and BA.5 have been reported to the Global Initiative on Sharing All Influenza Data database, according to WHO.
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