Non-infection associated genes encoding receptors included ROBO2; encoding the receptor for the secreted SLIT2 factor (both receptor and factor expressed higher in infected Holstein cells), TLR7, CD4, TRAF1 (TNF receptor associated factor 1), IL27RA, IL17RD and IRAK1 (Interleukin-1 receptor-associated kinase 1). This evidence concerns the gene IL17RD and infection.