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Background  The porcine respiratory tract harbours multiple microorganisms, and the interactions between these organisms could be associated with animal health status.  Pasteurella multocida  is a culturable facultative anaerobic bacterium isolated from healthy and diseased porcine respiratory tracts. The interaction between  P. multocida  and other aerobic commensal bacteria in the porcine respiratory tract is not well understood. This study aimed to determine the interactions between porcine  P. multocida  capsular serotype A and D strains and other culturable aerobic bacteria isolated from porcine respiratory tracts using a coculture assay in conditioned media followed by calculation of the growth rates and interaction parameters.    Results  One hundred and sixteen bacterial samples were isolated from five porcine respiratory tracts, and 93 isolates were identified and phylogenetically classified into fourteen genera based on 16S rRNA sequences. Thirteen isolates from Gram-negative bacterial genera and two isolates from the Gram-positive bacterial genus were selected for coculture with  P. multocida . From 17 × 17 (289) interaction pairs, the majority of 220 pairs had negative interactions indicating competition for nutrients and space, while 17 pairs were identified as mild cooperative or positive interactions indicating their coexistence. All conditioned media, except those of  Acinetobacter , could inhibit  P. multocida  growth. Conversely, the conditioned media of  P. multocida  also inhibited the growth of nine isolates plus themselves.    Conclusion  Negative interaction was the major interactions among the coculture of these 15 representative isolates and the coculture with  P. multocida . The conditioned media in this study might be further analysed to identify critical molecules and examined by the in vivo experiments. The study proposed the possibility of using these molecules in conditioned media to control  P. multocida  growth.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12866-020-02071-4.

bmc microbiology

Interaction study of Pasteurella multocida with culturable aerobic bacteria isolated from porcine respiratory tracts using coculture in conditioned media