IFNgamma-producing, virus-specific CD8+ effector cells acquire the ability to produce IL-10 as a result of entry into the infected lung environment.
Palmer EM, Holbrook BC, Arimilli S, Parks GD, Alexander-Miller MA. IFNgamma-producing, virus-specific CD8+ effector cells acquire the ability to produce IL-10 as a result of entry into the infected lung environment. Virology. 2010 Sep 01; 404(2):225-30.