U.K. Delays Second Covid-19 Vaccine Dose as Europe Ponders How to Speed Up Immunization... - 0 views
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The U.K. will focus on giving as many people as possible a first dose of a coronavirus vaccine, even if this delays administering a second one, the government said Tuesday, despite a lack of data about the extent of the immunity conferred by a single dose.
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A vaccine made by Pfizer Inc. and BioNTech SE was the first to be authorized in the West. It is now being unrolled globally after emergency authorizations by various regulators on the basis of a successful monthslong trial that involved giving two shots to more than 20,000 volunteers. The second injection was administered 21 days after the first.
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While the trial data shows that the vaccine conferred immunity to over 50% of the participants after the first dose, marketing only one shot would require a new study in which only one dose would be administered to another set of volunteers, said BioNTech Chief Executive Uğur Şahin.
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A vaccine developed by Moderna Inc., which was authorized in the U.S. and could be given a green light by the European Union regulator in January, also consists of two doses. A third vaccine, developed by Oxford University and AstraZeneca PLC and authorized by the U.K. Wednesday, similarly has two doses.
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Most scientists agree that well over 60% of a population would need to be immunized to achieve herd immunity, in which enough people are immune, either through vaccination or by contracting the disease, to stop the spread of a pathogen.
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Pierre Van Damme, a senior member of the task force, said Monday that using only one shot would allow for the vaccination of the majority of Belgium’s 11.5 million inhabitants before the summer. A government spokesman said a decision would be made in the next two weeks