Researchers say Pfizer's COVID vaccine is at least 88% effective against the Delta variant after two doses.
The differences were particularly notable after only one dose of either of the vaccines. With one dose of Pfizer, the effectiveness against the Alpha variant was 48.7% compared with 30.7% against the Delta variant. Results after one dose of the AstraZeneca vaccine were similar.
The Delta variant first emerged in India, but rapidly spread globally and is now fueling an increase in COVID cases in countries including the United Kingdom. In the United States, the Delta variant now accounts for at least"The fact [that] there is still notable effectiveness is encouraging. However, complacency is not warranted, since the virus will continue to cause at least mild disease even in some [of] those vaccinated with two doses," Stephen J. W.
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