14 Diseases You Can Prevent Just by Washing Your HandsHand-foot-and-mouth disease If you have kids or work around them, handwashing can help prevent this uncomfortable infection caused by the coxsackievirus Common in daycares and preschools, hand-foot-and-mouth disease (HFMD) causes sores on the mouth and throat, a rash on the hands and feet, a fever and loss of appetite, reports the Mayo Clinic
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