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Pasteurella multocida (P. multocida) is a highly infectious pathogen capable of co-infecting poorly maintained livestock with other pathogens like Mycoplasma hyopneumoniae, Actinobacillus pleuropneumoniae, Bordetella bronchiseptica, porcine reproductive and respiratory syndrome virus, and porcine Circovirus, resulting in severe respiratory diseases or atrophic rhinitis in the swine industry(4, 6, 15, 17, 21, 22). The serotype distributions and phenotypic characteristics of P. multocida show both temporal and geographical variations. In 1952, Carter (5) classified P. multocida into five capsular serotypes (A, B, D, E and F) by indirect haemagglutination test. In 2001, Townsend et al. found that the capsular genotypes of P. multocida strains identified by mPCR were agreeable to Carter’s serotyping results. In 1972, Heddleston and Gallagher (14) classified P. multocida strains into serotypes 1 through 16 using an agar-gel diffusion precipitin test based on lipopolysaccharide (LPS). LPS of P. multocida lacking the O antigen, contains a highly conserved inner core and a highly diverse outer core (13). In 2015, Harper et al. reported at least 22 types of outer core in P. multocida, that diversities in LPS were not outlined fully in Heddleston’s classification (12, 14). Harper et al. designed a rapid LPS-mPCR assay to genotype P. multocida strains based on the LPS outer core biosynthesis locus, and classified the strains into eight LPS genotypes: namely LPS genotype L1 covering Heddleston’s serotype 1 and 14; L2 covering Heddleston’s serotype 2/5; L3 covering Heddleston’s serotype 3 and 4; L4 covering Heddleston’s serotype 6 and 7; L5 covering Heddleston’s serotype 9; L6 1) This work was supported by the National Key Research and Development Program of China (2017YFD0500102). Capsular types, LPS genotypes, and virulence-associated genes of Pasteurella multocida strains isolated from pigs1)