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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.