“The scientific rationale I think is quite logical,” one researcher said.
At the U.S. National Institutes of Health, researchers are in early discussions about proposals to study the TB and polio vaccines as a possible COVID-19 defense, said agency spokeswoman Jennifer Routh.
BCG is given mostly to newborns in developing countries, and it offers only partial protection against TB, a bacterial infection. But observational studies showed during childhood, the vaccinated tots had better overall survival, including from respiratory viruses. In 2015, Danish researchers also found some hints of cross-protection after oral polio vaccinations. The oral drops still are used in developing countries while the U.S. and other areas that have eliminated polio use the inactivated shot for routine childhood vaccines.There are overlapping types of immune defenses. The usual goal of a vaccine is to prime the body to recognize a specific health threat and make antibodies able to fight back when that particular bug comes along.
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