By Abigail Klein Leichman Preliminary results of the world’s first study of a fourth dose of Covid-19 vaccines the second “booster” dose— indicate it is not effective enough against the current Omicron variant of the SARS-CoV-2 virus. The study is taking place at Israel’s largest hospital, Sheba Medical Center. “These are very preliminary results, and this is before any publication, […]
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