Immune response to lung infections.
Abbreviations: APC, antigen presenting cell; BALT, bronchial-associated lymphoid tissues; LN, lymph nodes; PAMPs, pathogen-associated molecular patterns; PRRs, pattern recognition receptors; resp, response; Th0, naïve T cells; Th1, type 1 helper T cells, Th2 cells, type 2 helper T cells.