To examine if the differential bacterial burdens in unvaccinated and H1-DDA/TDB-vaccinated C57BL/6 and IL-17A−/− mice are also reflected by an altered infection-associated lung pathology, we further performed histopathological analysis of lung tissue sections from the experimental mice 16 weeks after Mtb infection (Fig. 6b). The gene discussed is IL17A; the disease is infection.