BPIFA1 and Klebsiella pneumonia: It was also reported that BPIFA1 protein binding to bacterial lipopolysaccharide inhibited the growth of Pseudomonas aeruginosa [50], Klebsiella pneumonia [26], Mycoplasma pneumonia [27], and the Gram-positive bacteria Staphylococcus areus [28] by its antimicrobial and surfactant adjusting function.