Tell your H the following re EBV:-
"Infectious mononucleosis, or "mono," is a contagious viral illness that initially attacks the lymph nodes in the neck and throat. When these tissues become less effective in fighting infection, sore throats, swelling of the nodes and fever may result.
Mono is caused by the Epstein-Barr virus, which is named after the scientists who first identified it in the mid-1960s. The virus enters the lymph nodes and attacks the lymphocytes (the white blood cells manufactured there). As the white blood cells come into contact with the virus, they change shape and multiply. At first, there are no symptoms because it takes several weeks before enough of the altered cells can accumulate to generate infection.
The virus can affect anyone, but the infection most often occurs in people between the ages of 10 and 35, especially teenagers. It can occur as an epidemic or in single cases, and it is believed to be spread by infectious saliva.
The incubation period for the disease is usually seven to 14 days in children and adolescents. The incubation period in adults is longer; at times it may be 30 to 50 days.
If the virus lasts more than six months, it is frequently called chronic EBV infection. Some doctors think EBV is the cause of a chronic condition called Chronic Fatigue Syndrome (CFS), although this has not been definitively proven.
Mononucleosis spreads by contact with moisture from the mouth and throat of a person who is infected with the virus. Kissing, sharing drinking glasses, eating utensils, and toothbrushes, or touching anything that has been near the mouth of an infected person, may result in transmission of the disease".
You need to keep your child away from him and he must desist completely from kissing your child on the mouth. That to me is gross particularly as he has still persisted in doing that even though you have told him not to.