GENEVA: The Omicron subvariant, XBB.1.5, is causing concern among scientists after its rapid spread in the United States in December.Here is what we know so far:What is the XBB.1.5 subvariant and how does it behave?The World Health Organization’s senior epidemiologist Maria Van Kerkhove said XBB.1.5 is the most transmissible Omicron sub-variant that has been detected so far…
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