At one point in time, researchers believed that pellagra was caused by which one of the following?

Name: At one point in time, researchers believed that pellagra was caused by which one of the following?
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Researchers initially believed that pellagra was caused by an infection. This belief was due to the pattern of its spread and symptoms, resembling infectious diseases. It was later discovered to be caused by a deficiency in niacin (vitamin B3) and tryptophan.

At One Point in Time, Researchers Believed That Pellagra Was