PFAS and susceptibility to pneumonia measurement: Seven genes (purL, guaA, A1S_0419, A1S_2315, A1S_2585, A1S_2768, and A1S_3455) identified in the current study were also reported by Wang et al. (29) to contribute to persistence in the lungs during pneumonia, suggesting the presence of a core set of fitness genes involved in fitness during survival in the murine host, irrespective of the site of infection.