NOS2 and bronchopneumonia: Bronchopneumonia. Intranasally inoculated 8–12 weeks old B6.129S-Cybbtm1⋅Din/J (NADPH oxidase-deficient [gp91phox−/−]), B6.129P2-Nos2tm1⋅Lau/J (inducible nitric oxide synthase-deficient [NOS2−/−]), and C57BL/6 female mice with 1 × 107 CFU