Bass D J, Delpech V, Beard J, Bass P, Walls R S
Department of Immunology and Allergy, Concord Repatriation Hospital, Sydney, NSW, Australia.
Ann Allergy Asthma Immunol. 2000 Nov;85(5):374-81. doi: 10.1016/S1081-1206(10)62549-5.
Many people in the subtropical Northern Rivers area of New South Wales, Australia, blame the pollen of Tibouchina tree, which flowers at the same time as ragweed, Bahia grass and Bermuda grass, for hayfever and asthma exacerbations during fall between March and May.
To determine whether Tibouchina pollen is allergenic. To determine whether airborne ragweed pollen is present in this region for sufficient length of time and concentration to cause fall respiratory symptoms, and to determine if Bahia grass and Bermuda grass are associated with fall respiratory symptoms.
Pollen and Alternaria spores were monitored using a Burkard 7-day spore trap. Two hundred and six volunteers in the Northern Rivers area filled in questionnaires before skin prick tests (SPT) were performed with a panel of skin testing extracts.
One hundred fifty-three (74.3%) subjects were atopic and reacted to one or more aeroallergens. Seventy were SPT positive to ragweed, OR 3.36 (CI 1.03 to 12.15) and 11 to Tibouchina (OR incalculable). Fifty of the 70 ragweed-positive subjects had fall hayfever or exacerbations of hayfever and/or asthma, OR 23.4 (CI 8.90 to 64.00). Eleven subjects were SPT positive to Tibouchina extract. There was a statistical association between Bermuda grass and hayfever, but not asthma OR 13.44 (CI 1.85 to 27.04).
Ragweed pollen was present for a sufficient length of time and concentration to sensitize and provoke fall hayfever and asthma exacerbations. Tibouchina pollen is an aeroallergen causing mild-to-moderate allergic symptoms in a few people. There is an association between Bahia grass and asthma in children, and between Bermuda grass and allergic rhinitis in adults.
在澳大利亚新南威尔士州亚热带的北河地区，许多人认为蒂布契纳树的花粉是导致3月至5月秋季花粉症和哮喘发作的原因，该树与豚草、巴伊亚草和百慕大草同时开花。
确定蒂布契纳花粉是否具有致敏性。确定该地区空气中豚草花粉的存在时间和浓度是否足以引发秋季呼吸道症状，并确定巴伊亚草和百慕大草是否与秋季呼吸道症状有关。
使用Burkard 7天孢子捕捉器监测花粉和链格孢属孢子。北河地区的206名志愿者在使用一组皮肤测试提取物进行皮肤点刺试验（SPT）之前填写了问卷。
153名（74.3%）受试者为特应性体质，对一种或多种气传变应原产生反应。70人对豚草SPT呈阳性，比值比（OR）为3.36（95%置信区间[CI]为1.03至12.15），11人对蒂布契纳呈阳性（OR无法计算）。70名豚草阳性受试者中有50人出现秋季花粉症或花粉症和/或哮喘加重，OR为23.4（CI为8.90至64.00）。11名受试者对蒂布契纳提取物SPT呈阳性。百慕大草与花粉症之间存在统计学关联，但与哮喘无关，OR为13.44（CI为1.85至27.04）。
豚草花粉存在的时间和浓度足以致敏并引发秋季花粉症和哮喘发作。蒂布契纳花粉是一种气传变应原，在少数人身上会引起轻度至中度过敏症状。巴伊亚草与儿童哮喘之间以及百慕大草与成人过敏性鼻炎之间存在关联。
