Microbiology Patients with C5 through C9 complement deficiencies would be most likely to have which of the following infections? A AIDS B Meningococcal infection C Pneumococcal infection D Giardiasis 💡 Explanation Patients with C5 through C9 complement deficiencies would be most likely to have which of the following infections? ✓ Correct Answer: B. Meningococcal infection