Acute
Having a short and relatively severe course. In opposition to chronic Type I Hypersensitivity or Anaphylactic Shock

Asymptomatic
Infection without symptoms. Someone who is asymptomatic has antibodies (for example, to HIV) but does not have any visible signs or symptoms (example, of HIV infection).

Chronic
Long-lasting and severe, opposite of Acute. Examples include: Chronic Atopic Dermatitis ; Chronic Bronchitis ; Chronic Cough; Chronic Rhinitis ; Chronic Ulcerative Colitis

Gastrointestinal ( GI )
Relating to the stomach and intestines.

Systemic
Throughout the body. Sometimes applies to medications that are taken orally or parenterally that saturate the entire body.