Abstract
The response of lymphocytes, obtained from the peripheral blood of horses infected with equine infectious anaemia (EIA) virus, to the antigen of EIA virus was studied by measurement of uptake of tritiated thymidine in lymphocyte cultures. Lymphocyte response increased shortly after the primary infection. It decreased during the asymptomatic stage, but again increased to a high level after a recurrence of signs. Lymphocytes from horses with a long asymptomatic stage rarely showed a positive reaction. In chronic infections with EIA virus, however, horses occasionally showed a spontaneous temporary increase in lymphocyte response to EIA virus antigen without any other signs of EIA. Lymphocytes from horses infected with different strains of EIA virus were stimulated by both homologous and heterologous EIA virus antigen. The possible relationship between the stimulation of lymphocytes and cell-mediated immunity in EIA is discussed.
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