Jon CohenScience’s COVID-19 reporting is supported by the Pulitzer Center and the Heising-Simons Foundation.Enthusiasm and confusion greeted announcements this week about the efficacy of a vaccine candidate from the University of Oxford and AstraZeneca, which is now the fourth to report preliminary results of success in press releases.“It’s very good to have positive results from different platforms,” says Ana Maria Henao Restrepo, who is leading an effort at the World Health Organization to stage COVID-19 trials that compare different vaccines’ efficacy. “That reaffirms our positive feelings that vaccines against this virus can be efficacious.”But many people raised questions about the relatively inexpensive vaccine from Oxford and.
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