On the efficacy of vaccines against the Omicron variant a greater efficacy towards symptomatic disease emerged two weeks after the booster, comparable or slightly lower than that towards Delta. A study not yet peer-reviewed also reports a loss of efficacy in the primary cycle with respect to hospitalization, although to a lesser extent than in symptomatic disease. The Higher Institute of Health (Iss) writes on the Faqs published on the site.
Existing PCR-based tests also detect infection with Omicron. Due to the mutations, many monoclonal antibodies lose their effectiveness.
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