Furthermore, histological changes observed in the mammary gland tissue of infected wild-type postpartum mice, such as destruction of the alveolus wall, hemorrhage, and the extensive presence of inflammatory cells, were improved in infected IFNGR1-KO postpartum mice on day 14 post-delivery (on day 7 post-infection; Fig 4C–4E). Here, IFNGR1 is linked to infection.