IFNB1 and infection: However, when comparing the post ‘late’ H37Rv-infection vs. post ‘early’ Δ-mce1 H37Rv-infection groups only Il12b and Il13ra1 showed a significant difference in the level of transcription between the two types of infection (P<0.001) and for the post ‘late’ H37Rv-infection vs. post ‘late’ Δ-mce1 H37Rv-infection groups only Ifnb1 (P<0.001) showed a significant difference in the level of transcription between the two types of infection.