Timeline Event - year 1997 New asthma guidelines recommend mite allergen avoidance in asthma management.   Newly revised British Thoracic Society Guidelines for the Management of Asthma are published and distributed.  The guidelines offer some support for mite avoidance, but report that mite reduction is very difficult to achieve and benefits remain to be proven effective. Reference Thorax; Feb. 1997 Vol. 52, Supplement 1, page S4