ABSTRACT
ETIOLOGY ■ The epidemiologic features of asthma are listed in Table 2.
Risk Factors ■ Several different associations place persons at risk for the
development of asthma. ■ Known risk factors
▲ Bronchial hyperresponsiveness ▲ Atopy ▲ Rhinitis with or without postnasal drip ▲ Exposure to indoor allergens (particularly dust mites,
animal dander, mice, cockroaches, and fungi) ▲ Exposure to outdoor allergens (particularly particulate
pollution)
Ta bl
e 1 .
