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Although the role of both IL-1b and Il-6 in IPA due to A. fumigatus have been previously characterized, their expression profile involved in the pathogensis of A. flavus not yet been fully elucidated. Moreover, little is known about the differences of expression level of both il-1b and il-6 cytokines on the molecular level, between immunosuppressed versus immunocompetent murine models of IPA with A. fumigatus or A. flavus. In the present study, immunosuppressed and immunocompetent mice were infected intranasally with A. fumigatus or A. flavus conidia and were monitored for parameters of fungal colonization, histopathological changes and il-1b and il-6 expression levels and mutational frequency, and their contribution to IPA progression.