Fig. 5.

Stimulation of T lymphocytes by infected B2 macrophages was not entirely MHC restricted. The B2 infected macrophages stimulated heterologous B19 T lymphocytes while B19 infected macrophages had essentially no impact on B2 T lymphocytes (p < 0.05). B2 uninf M or B19 uninf M represent uninfected macrophages cultured with heterologous /B19 or /B2 T cells from vaccinated birds. B2 AIV M represent infected B2 derived macrophages cultured with B19 derived T lymphocytes and B19 AIV M represent infected B19 macrophages cultured with B2 derived T lymphocytes.