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). Here, TLR7 is linked to infection.