• Fasciitis, Necrotizing — see Group A Strep Infection
  • Fascioliasis
  • Fasciolopsiasis
  • Fetal Alcohol Spectrum Disorder
  • Filariasis, Lymphatic
  • Flu
  • Folliculitis — see Hot Tub Rash
  • Food Poisoning — see Foodborne Illness
  • Food-Related Diseases
  • Fragile X Syndrome (FXS)
  • Francisella tularensis
  • Fungal diseases [Mycotic diseases]
    • C. gattii cryptococcosis
    • C. neoformans cryptococcosis
    • Candida Infection [Candidiasis]
    • Histoplasma capsulatum Infection [Histoplasmosis]
    • Aspergillus Infection [Aspergillosis]
    • Blastomycosis [Blastomyces dermatitidis Infection]
    • Fungal Eye Infections
    • Histoplasmosis [Histoplasma capsulatum Infection]
    • Mucormycosis
    • Pneumocystis pneumonia (PCP) [Pneumocystis jirovecii pneumonia (previously Pneumocystis carinii) ]
    • Ringworm [Dermatophyte Infection]
    • Sporotrichosis
    • Sporotrichosis [Sporothrix schenckii infection]
    • Valley Fever [Coccidioidomycosis]