Infectious mononucleosis is caused by the Epstein-Barr virus (EBV). EBV is believed to be present in saliva. Most young children infected with EBV show no symptoms, unlike older children and adults, who may have fever, fatigue, enlarged neck lymph nodes, and inflamed throat and tonsils.

Infectious mononucleosis is spread from person to person through contact with the saliva of an infected person. The virus spreads more rapidly among children in closed or overcrowded conditions. Most adults have been exposed to EBV by the age of 18 years and are immune.

If a person in your facility develops infectious mononucleosis:

The infected person may return to the childcare setting when he or she is able to participate in usual activities.

Make sure all children and adults do not share eating or drinking utensils.

Make sure all children and adults follow good hand washing practices.

© January 1997