title: Reappraisal of prick test to tree and weed antigens.
abstract: Although 3+ or 4+ prick test reactions to olive tree or Russian thistle are valid, the RAST values to these antigens are significantly lower than those in patients with similar reactions to grass antigens, suggesting that nonimmunologic factors are partially responsible for the skin test reactions to the tree and weed antigens.
mesh_terms: D000941:Antigens; D006636:Histamine Release; D006801:Humans; D008213:Lymphocyte Activation; D009299:Nasal Provocation Tests; D011852:Radioallergosorbent Test; D012220:Rhinitis / Q000175:diagnosis*; D012882:Skin Tests
chemical_list: D000941:Antigens