CD8A and pulmonary tuberculosis: As shown in Table 1, infection with W. bancrofti or S. stercoralis in the context of active pulmonary TB was not associated with significant alterations in the absolute numbers of CD4+ and CD8+ T cells nor in the frequency distribution of the various T cell subsets - naive, central memory, effector memory and regulatory T cells - when compared to helminth-uninfected individuals with active TB.