Caused by a common virus called herpes simplex (HSV-1), cold sores are contagious and can spread from person to person through skin-to-skin contact or by sharing items (such as eating utensils, lip balm, towels, cosmetics, and food), even when they aren't visible.
Infectious mononucleosis, or mono, refers to a group of symptoms usually caused by the Epstein-Barr virus (EBV). It typically occurs in teenagers, but you can get it at any age. People with mono often have a high fever, swollen lymph glands, and a sore throat.
Epstein-Barr virus (EBV), a widespread human herpes virus, can cause mononucleosis â but usually it doesn't. In fact, most EBV infections aren ... In that age group, at least a quarter of infections cause mononucleosis â a disease that features fatigue, headache, fever, sore throat ...