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ba1 omicron-variant
Vaccines were more effective against Delta variant, CDC study finds
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South Korea lifts most of Covid restrictions citing drop in daily cases
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BA.2 Covid variant driving new infections in some parts of US
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WHO tracks two new Omicron subvariants: What are BA.4 and BA.5 strains?
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Amid rise in COVID-19 cases in US, Philadelphia reinstates indoor mask policy
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AstraZeneca claims its COVID-19 antibody concoction can neutralise BA.2 Omicron sub-variant
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Omicron's subvariant BA.2 may cause severe disease: Study
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Explainer: What is the new 'stealth Omicron'?
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