Due to the important role of the indicated groups of immune cells in the body’s response to pathogens, the decrease in their number, along with the decrease in the concentration of the immune peptide CAMP and molecules integrating the cellular and humoral response (IL12 and IFNγ) recorded by ELISA in VD3-deficient mice, were a sign of their greater sensitivity to the development of HP. Here, CAMP is linked to hypersensitivity pneumonitis.