Sweden, UK, also set new daily records as top WHO official says low hospitalization rates in South Africa are no guarantee Omicron will hit other countries as mildly
Series of experiments on mice, hamsters all reach same conclusion that new coronavirus strain mainly manifests in upper airway, causing fewer breathing problems
Registered infections up 37% since previous week and now stand at 6.55 million globally, the highest figures since the UN health agency declared a pandemic in March 2020
Even though it's facing much smaller outbreak compared with global virus hotspots, China has not relaxed its 'zero COVID' strategy, imposing stay-at-home orders in many areas
UN health agency cites data indicating infections from new variant are 'mild' or asymptomatic, predicts it will overtake Delta 'where community transmission occurs'
First research from South Africa indicates drop in effectiveness of Pfizer vaccine, but Omicron does not completely evade shot; boosters are beneficial
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