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COVID-origins investigations: WHO shelves 2nd phase, House Republicans summon Fauci and other officials for their hearings

The World Health Organization (WHO) has quietly shelved the second phase of its much-anticipated scientific investigation into the origins of the COVID-19 pandemic, citing ongoing challenges over attempts to conduct crucial studies in China, Nature has learned. ...

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Two-dose COVID vaccine is effective against severe Omicron but less so for those over 80 -- Hong Kong study

Two-dose COVID vaccine efficacy durable against severe Omicron but drops in elderly

 

Overall two-dose vaccine effectiveness (VE) against Omicron variant-related hospitalization or death remained above 70% for at least 6 months among adults in Hong Kong but dropped to below 62% in those aged 80 and older, necessitating a third dose, finds a case-control study published today in JAMA Network Open.

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