Stop Cold Sores from Spreading

Cold sores are very contagious. Also called fever blisters, cold sores are the result of the herpes simplex 1 virus (HSV-1). HSV-1 is related to the virus that causes genital herpes, herpes simplex 2. About half of all Americans over 20 have been infected with HSV-1, and 10 percent of infections result in a cold …

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