1.

Vaccines developed by which of the following produces an immune response in both young and old adults, raising hopes of a path out of the gloom and economic destruction wrought by the novel coronavirus?

A. University of Oxford
B. AstraZeneca
C. GlaxoSmithKline
D. Both 1 and 2
E. Both 1 and 3
Answer» E. Both 1 and 3


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