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He mentions certain infectious bacterial diseases,
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some of them very familiar to you already:
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bubonic plague,
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Asiatic cholera.
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He adds leprosy.
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He then moves on to certain nutritional diseases:
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pellagra,
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which is caused by a deficiency of niacin,
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if your diet consists not of wheat,
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but exclusively of corn;
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or beriberi, or certain fungal diseases.
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And he even calls heatstroke a tropical disease.