IL17A and infection: Indeed, other primary immunodeficiencies that are selective for the absence of IL17F (autosomal dominant IL-17F deficiency) or lack a response to IL17 (autosomal recessive IL-17RA deficiency) further illustrate the importance of IL-17 production for control of bacterial (i.e. S. aureus) and fungal (i.e. C. albicans) infection [8].