| INA | infectious nucleic acid; inferior nasal artery; International Neurological Association |
|---|---|
| inf | mono infectious mononucleosis |
| IPE | infectious porcine encephalomyelitis; interstitial pulmonary emphysema |
| IPN | infantile polyarteritis nodosa; infectious pancreatic necrosis [of trout]; intern progress note; int... |
| iu | infectious unit |