| immediate hypersensitivity to parthenium hysterophorus. ii. clinical studies on the prevalence of parthenium rhinitis. | the airborne pollen of the south american weed, parthenium hysterophorus (american feverfew), accidentally introduced into india was found to be responsible for severe allergic rhinitis. a random clinical survey conducted on 2035 residents of bangalore city with the aid of questionnaires and skin tests revealed that 7.1% of the study population was suffering from allergic rhinitis due to exposure to parthenium pollen. skin-prick tests performed on 1294 clinic patients suffering from nasobronchia ... | 1991 | 2021879 |