Could old vaccines for other germs protect against COVID-19?

Modern Healthcare: Scientists are dusting off some decades-old vaccines against other germs to see if they could provide a little stopgap protection against COVID-19 until a more precise shot arrives.

It may sound odd: Vaccines are designed to target a specific disease. But vaccines made using live strains of bacteria or viruses seem to boost the immune system's first line of defense, a more general way to guard against germs.

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