The C.D.C. Is Preparing for 2 Covid-19 Vaccines. Here’s What You Need to Know.

The C.D.C. Is Preparing for 2 Covid-19 Vaccines. Here’s What You Need to Know.

The agency told public health agencies that two unidentified vaccines might be ready by October or November. We explain how vaccine trials work, when one might be ready, and who may get them first.

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