The World Health Organization is investigating two new sub-variants of the highly contagious Omicron strain of COVID-19 to determine if they pose a greater risk.The organization announced Monday it’s tracking a few dozen cases of BA.4 and BA.5, sister variants of the original BA.1 Omicron strain.The WHO is keeping tabs on the two subvariants to determine whether they are more dangerous — or even more infectious — than previous strains because of their “additional mutations.”
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