• Naegleria Infection [Primary Amebic Meningoencephalitis (PAM)]
  • Necrotizing Fasciitis — see Group A Strep Infection
  • Neglected Tropical Diseases (NTD)
  • Pneumocystis jirovecii pneumonia (previously Pneumocystis carinii) — see Pneumocystis pneumonia
  • Neurocysticercosis
  • Nocardiosis [Nocardia asteroides Infection]
  • Non-Polio Enterovirus Infections
  • Nonpathogenic (Harmless) Intestinal Protozoa
  • Norovirus Infection
  • Norwalk-like Viruses (NLV)