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Vaccines prevent between 2.5 and 4 million deaths every year.
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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.