CCL2 and infection: Linear regression analysis further revealed strong coefficients of determination (R2) for CSF3, CCL2, CCL3, and IL1B (R2 ≥ 0.7216) in C57BL/6J mice (Figure 6B), indicating that inflammatory cytokine lung concentrations may be sufficient to explain most body weight variation in C57BL/6J mice at days 1, 3, and 6 post-infection.