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Pfizer and Moderna vaccines useless against Omicron variant.

A fourth dose of coronavirus vaccine showed dwindling effectiveness against the Omicron variant, according to a trial conducted in Israel, with one its lead researchers saying the immunization is simply “not good enough.”

A study involving 154 medical staffers at Sheba Medical Center near Tel Aviv found that a fourth shot of the Pfizer vaccine gave only marginal protection against the Omicron strain compared to previous mutations. A separate group of 120 volunteers were also given a fourth dose of Moderna's inoculation following three rounds with Pfizer, but their immune response was similar.