螨类是一种普遍存在的生物,由于它们体积很小,如果不用显微镜就看不到,但在各种自然条件或人类的生活环境中都可出现它们的踪迹。它们可引起人体许多过敏反应,如过敏性哮喘、过敏性鼻炎、特应性皮炎和荨麻疹。 Mites are ubiquitous organisms that, because of their small size, can not be seen without a microscope, but can appear in a variety of natural conditions or in human life. They cause many of the body’s allergic reactions, such as allergic asthma, allergic rhinitis, atopic dermatitis and urticaria.