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.
About 90% of cases of infectious mononucleosis are caused by the EpsteinâBarr virus, a member of the Herpesviridae family of DNA viruses. It is one of the most commonly found viruses throughout the world.Contrary to common belief, the EpsteinâBarr virus is not highly contagious.bout 90% of cases of infectious mononucleosis are caused by the EpsteinâBarr virus, a member of the Herpesviridae family of DNA viruses. It is one of the most commonly found viruses throughout the world.