Three distinguished experts interviewed by GEN, and two investment firms that track biopharma stocks, agreed that four leading COVID-19 vaccine candidates showed sufficient promise in early clinical studies to warrant interest in upcoming trials: AZD1222 by AstraZeneca, the University of Oxford, and its spinout Vaccitech; BNT162b1, the most advanced of four vaccine constructs by Pfizer and BioNTech; mRNA-1273 by Moderna; and Ad5-nCoV by CanSino Biologics . . .

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