COVID: First signs that vaccine protects against Omicron – from Israel Pfizer is just slightly less effective in preventing infection with Omicron (90%) than Delta (95%) Those not Vaccinated have a 2.4 x greater chance of developing serious symptoms

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source https://www.reddit.com/r/worldnews/comments/r6eb6c/covid_first_signs_that_vaccine_protects_against/