BIOD26 – Lecture 7 – Human Pathogens, Virulence and Pathogenicity: Role of Cell Wall and Other Surfaces Structures Aspergillus biofilm formation - - (A) Scanning electron microscopy images of A. fumigatus biofilms grown on coverslips. Biofilms were grown for 24 h. Measurement bars represent 10 and 1 µm for 2,500× and 30,000×, respectively. (B) Summary of innate immune responses impaired by A. fumigatus biofilms.