Epstein Barr Virus infects endothelial cells
and B cells. About half of us are infected by the virus while
very young, and do not suffer disease. Around half of individuals
who avoid the virus while young are infected in the teenage years
and develop a disease called mononucleosis. In this disease, lymph
nodes swell painfully as our immune system produces large numbers
of lymphocytes to eliminate virus-producing cells. These lymphocytes
are probably: