GENEVA (AP) - A top World Health Organization official estimated Monday that COVID-19 vaccination coverage of at least 80% is needed to significantly lower the risk that "imported" coronavirus cases like those linked to new variants could spawn a cluster or a wider outbreak.Dr.
Michael Ryan, WHO's emergencies chief, told a news conference that ultimately, "high levels of vaccination coverage are the way out of this pandemic."Many rich countries have been moving to vaccinate teenagers and children — who have lower risk of more dangerous cases of COVID-19 than the elderly or people with comorbidities — even as those same countries face pressure to share vaccines with poorer ones that lack them.Britain, which has vastly reduced case counts.