Plantago lanceolata (English plantain) pollinosis in Japan

P. lanceolata was dispersed over a long period, from mid-May to early September. The P. lanceolata RAST-positive rate (12.8%) was similar to those for sagebrush and ragweed, which are dispersed during the fall. These results suggest that P. lanceolata is an important causative agent of pollinosis in Japan.