Journal of Aging and Geriatric Psychiatry

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Journal of Aging and Geriatric Psychiatry 44 7897 074717

{viral | Disease's}

But bacteria can cause trouble too, as with cavities, urinary tract infections, ear infections, or strep throat. Antibiotics are used to treat bacterial infections.

Viruses are even smaller than bacteria. They aren't even a full cell. They are simply genetic material (DNA or RNA) packaged inside of a protein coating. They need to use another cell's structures to reproduce. This means they can't survive unless they're living inside something else (such as a person, animal, or plant).

Viruses can only live for a very short time outside other living cells. For example, viruses in infected body fluids left on surfaces like a doorknob or toilet seat can live there for a short time. They'll die quickly unless a live host comes along.

When they've moved into someone's body, though, viruses spread easily and can make a person sick. Viruses cause minor sicknesses like colds, common illnesses like the flu, and very serious diseases like smallpox or HIV/AIDS.

Antibiotics are not effective against viruses. Antiviral medicines have been developed against a small, select group of viruses.

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