homeworktest experimental vaccineShare on FacebookShare on Twitter478IMAGESVaccine Testing For COVID-19 Proves PromisingExperimental vaccine that boosts antigen production shows promiseExperimental COVID-19 vaccine is put to its biggest testExperimental Virus Vaccine From Pfizer and BioNtech Shows Promise [Video]First experimental COVID-19 vaccine created by Mass. biotech companyCoronavirus vaccine test opens as U.S. volunteer gets 1st shot
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