The European Centre for Disease Prevention and Control (ECDC) says the latest rapidly spreading sub-variant of the Covid-19 virus does not pose a major risk for most people in Europe. Experts warned in an assessment published on Friday that vulnerable people such as the elderly, the unvaccinated or those with compromised immune systems are at a moderate-to-high risk from Omicron sub-variant XBB.1.5. But they said the risk to the general population across the European Economic Area from the sub-variant appears to be low, adding a caveat. “Several knowledge gaps exist with XBB.1.5 and this asses…