The offshoot accounts for 40% of Covid cases in the US, raising fears of fresh waves of illness as it spreads to other countries
Scientists have raised concerns about a new Covid variant that is spreading fast in the US and threatening to cause further waves of infection. Here’s what we know so far.It’s known as XBB.1.5. It’s one of the latest descendants of Omicron, the highly transmissible version of Covid that caused cases to surge in the UK last winter. Offshoots of Omicron have dominated global Covid infections ever since. XBB.1.5 evolved from the XBB variant of Omicron, itself a fusion of two different BA.
Paradoxically, the winter wave of influenza and other nasty respiratory viruses that are doing the rounds might blunt any spike in Covid. If you catch a virus it should activate the innate immune system, the body’s frontline defences against pathogens, offering at least some protection against viruses that follow soon after. So if you caught flu or another respiratory virus over Christmas, your immune defences might resist a brief encounter with Covid.
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