Most people have never heard of this deadly germ, but Dr. Oz says medical experts have been worried about it for years.

Methicillin-resistant staphylococcus aureus—MRSA for short—is a rapidly spreading strain of deadly bacteria that's become resistant to commonly prescribed antibiotics. This superbug affects millions of people, and according to the Centers for Disease Control, kills 19,000 Americans each year, which is higher than the death toll for AIDS.

Symptoms include warm and tender skin, sores, boils, draining puss, redness, swelling and high fever. "If left untreated, it can destroy muscle tissue and lead to life-threatening infections in bones and vital organs," Dr. Oz says.

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