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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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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.