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Glaesserella  (formerly  Haemophilus )  parasuis  causes Glässer’s disease, which results in high economic loss in the swine industry. To understand the polymicrobial interactions of  G. parasuis  and the nasal microbiota, the statistical association patterns of nasal colonizing bacteria with virulent and non-virulent strains of  G. parasuis  were studied accounting for the farm management practices as potential risk factors for the occurrence of Glässer’s disease. The nasal microbiota from 51 weaned-piglets from four farms with Glässer’s disease and three farms with no respiratory diseases was previously characterized and included in this study. The presence of virulent and/or non-virulent  G. parasuis  strains in the nasal cavities was determined in order to establish the potential association with other members of the nasal microbiota. Multivariate logistic and linear regression models were performed among the various members of nasal microbiota and  G. parasuis . The multi-site production system and disease presence in the farm were both significantly associated with the presence of  G. parasuis  virulent strains in the nose of the piglets. Differential bacterial associations were observed with virulent or non-virulent  G. parasuis .  Chitinophagaceae ,  Corynebacteriaceae  and  Corynebacterium  were positively associated with the virulent  G. parasuis  strains, while  Enterobacteriaceae, Peptostreptococcaceae ,  Clostridium XI,  and  Escherichia/Shigella  were negatively associated with virulent  G. parasuis . On the other hand,  Flavobacteriaceae ,  Planobacterium , and  Phascolarctobacterium  were positively associated with the non-virulent  G. parasuis  strains, while  Rikenellaceae ,  Enterococcaceae ,  Odoribacter , and  Corynebacterium  were negatively associated with non-virulent  G. parasuis . In conclusion, the nasal microbiota communities showed variations in the association with the  G. parasuis  strains type.

Variations in association of nasal microbiota with virulent and non-virulent strains of Glaesserella (Haemophilus) parasuis in weaning piglets