IFNG and infection: In our study, the high levels of IFN-γ measured in BALF from Lena-infected pigs corroborate previous results that show a similar IFN-γ response after infection with the HP genotype 1.3 SU1-bel strain [8], but contrast with the results indicating lower ELISPOT IFN-γ BALF cell response for the Lena strain than for the LP Lelystad strain at 35 dpi [20].