MPO and infection: The innate immune response after infection of rabbits with over thirty different strains of L. europaeus was mainly manifested by variable phagocytosis activity by neutrophils and the killing capacity of leukocytes through the activity of enzymes with killing/antiviral properties—myeloperoxidase (MPO) and lysozyme (LZM) [20,27,28,29,30,31,32,33].