Mononucleosis, or infectious mononucleosis (“mono”), is a very contagious viral infection that most commonly affects teenagers and young adults, but it can affect children, as well.

Learn about mono symptoms, how it's spread, and how to prevent it.

Mono develops in four main stages, from incubation to full recovery. Find out what symptoms appear and how long they last.

What Are the Stages of Mono and How Long Do They Last?

Mononucleosis is an infectious illness that’s usually caused by the Epstein-Barr virus (EBV). It’s also called mono or "the kissing disease." It's commonly spread through saliva. You can get...

Infectious mononucleosis (IM, mono), also known as glandular fever, is an infection usually caused by the Epstein–Barr virus (EBV). [2][3] Most people are infected by the virus as children, when the disease produces few or no symptoms. [2]

Mononucleosis (mono) causes symptoms like fatigue, sore throat, and swollen lymph nodes. Some people may also have a fever, abdominal pain, and rash.

What Is Mono? Mono, or infectious mononucleosis, is a contagious illness most commonly caused by the Epstein-Barr virus, a member of the herpes virus family.

Infectious mononucleosis, or mono, is commonly referred to as the “kissing disease” because it’s spread through saliva. Learn what causes mono and how it’s treated.

Mononucleosis is most often caused by the Epstein-Barr virus, though it can be caused by other viruses. Mononucleosis has been nicknamed the "kissing disease." This is because Epstein-Barr virus commonly is transmitted during kissing. However, sneezes and coughs also can transmit the virus.