Microbiology Opsonic index is the ratio of ? A C3b opsonin to antibody opsinin B Phagocytic activity of patient to phagocytic activity of normal individual C Serum concentration of opsonin in patient to serum concentration in normal individual D Complement activity in patient to complement activity in normal individual 💡 Explanation Opsonic index is the ratio of ? ✓ Correct Answer: B. Phagocytic activity of patient to phagocytic activity of normal individual