Abstract
The prevalence of allergic disorders, such as asthma, hay fever, and atopic dermatitis, has increased dramatically over the past few decades. Although the important inherited component in these diseases is well established, the role of environmental factors in relation to allergic disorders has become increasingly topical in the last decade. Immunologic data show that different infections can either promote atopy (as in respiratory syncytial virus infections) or inhibit it (as in measles, hepatitis A, and tuberculosis). Although there are 400 million hepatitis B virus (HBV) carriers around the world, and asymptomatic HBV carriers with a high level of virus replication are characterized by Th2-type immune reactions, the relationship between HBV carriers and atopic disorders has not been studied.
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