For lysozyme assay, Micrococcus lysodeicticus (MTCC No *106) bacteria was cultured in Staphylococcus broth (Himedia, India) containing 1% D-glucose. After 24 h of incubation, the culture was centrifuged and the bacterial pellet was lyophilized. Lysozyme was determined by incubating 10 μL of serum with 1 mL of M. lysodeicticus (20 mg 100/mL) suspended in acetate buffer (0.02 M, pH 5.5) for 60 min at room temperature. After adding the sample, the initial absorbance was noted immediately at 450 nm. The final absorbance was taken after 60 min of incubation. The standard curve was prepared using hen egg lysozyme (1 mg/mL).