1-and-done is now 2-and-done for Johnson & Johnson. Plus, where did all the COVID-19 testing kits go?

The Johnson & Johnson vaccine might be 2-and-done instead of 1-and-done now. A new study details how a second shot offers a lot more protection.

The U.S. is dealing with a shortage of COVID-19 testing kits. Will this hurt the ability to prevent outbreaks?

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