Preliminary laboratory studies indicate that two doses of the Pfizer / BioNTech vaccine may not provide sufficient protection against the omicron variant of the coronavirus, but three doses are capable of neutralizing it.
The pharmaceutical firms, in a statement released today, indicated that a group of patients who had received two doses of the vaccine against covid-19 showed an efficacy against the omicron variant 25 times less than against the virus in its previous variant.
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