Background:
Aspergillus fumigatus (AF) is responsible for 90% of human infections. The lung is the predominate site of infection. It is able to colonize in respiratory tract of asymptomatic population and changed clinical features from noninvasive to invasive according to immuncomponent state of individuals. The aim of the present study was to determine the frequency of AF immunoglobulin (IgG) antibodies among chronic persistent asthmatic patients in Tehran.