http://www.hayfeverexpert.co.ukCoping With and Relieving Hayfever .en-usThu, 01 May 2008 14:42:00 GMT Thu, 01 May 2008 14:42:00 GMTHayfeverExpert Content Managerjanem@hayfeverexpert.co.ukjanem@hayfeverexpert.co.ukhttp://www.hayfeverexpert.co.uk/hayfever-and-hygiene-therapy.htmlThe hygiene theory suggests that allergies such as hay fever occur because improved hygiene in developed nations has resulted in less exposure to microbes that 'prime' the immune system. Wed, 26 Mar 2008