Two recently-released studies examine the efficacy of single coronavirus vaccine doses against the delta variant showed vastly disparate outcomes.
The first, a Canadian pre-print study posted on medRxiv earlier this month, concluded that a single dose of the Pfizer, Moderna and AstraZeneca vaccines provide “good to excellent protection” against the delta variant of coronavirus. But a single dose of the Pfizer and AstraZeneca vaccines was shown to have relatively low efficacy combating the variant, according to a U.K. study published this week in The New England Journal of Medicine.
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