Concerns raised over single-dose of Pfizer's vaccine in UK

WHO assesses vaccines from China EU strongly discourages non-essential travel UK stance on ambassador riles EU Chinese jabs among candidates for world Concerns raised over single-dose of Pfizer's vaccine in UK Portuguese president wins re-election: preliminary results Sweden asks travelers from Norway to self-quarantine Tighter curbs sought for EU virus hot spots Moscow criticizes US embassy for supporting unsanctioned protests A trusty antivirus ally: bring in the dog squad British PM says new variant may carry higher risk of death Rich nations exaggerate climate finance Moscow eases curbs after vaccine credited for gains Erdogan says 2nd batch of Chinese vaccines to arrive by weekend Russia says it welcomes US proposal on extension of New START UK mulls hotel quarantine amid new coronavirus variant concerns US embassy condemned for stirring protests Londoners urged to wear masks in open air COVID vaccine 'may become annual shot': UK expert