COVID-19 vaccine effective against highly contagious XBB variant: CDC
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Covid-19 vaccines and boosters are effective against the highly transmissible sub-lineages of Omicron -- XBB and its subvariant XBB.1.5 -- the US Centers for Disease Control and Prevention (CDC) has said. First seen in August, XBB.1.5 now accounts for nearly 90 per cent of all Covid-19 cases reported in the US, the CDC said.