IL6 and infection: From qRT-PCR validation, we confirmed that FadA could inhibit the expression of the proinflammatory cytokine Il6. It has been shown that IL-6 has a crucial role in protecting against infection by high doses of intravenously delivered M. tuberculosis26, but is not required for the generation of specific immunity to infection by low-dose aerosol-delivered M. tuberculosis in C57BL/6J mice49.