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The objective of this study was to evaluate the genetic diversity of  Moraxella bovis  and  Moraxella bovoculi  bacteria isolated from infectious bovine keratoconjunctivitis (IBK) outbreaks in the state of Rio Grande do Sul, Brazil. The genetic diversity among  Moraxella  spp. was evaluated by RAPD-PCR, JWP1-JWOPA07-PCR, ERIC-PCR and by sequencing the 16S-23S intergenic regions. Based on the dendrogram, two genetically differentiated clades were observed; 14 isolates were classified as  M. bovis  and 17 as  M. bovoculi . Genetic distances between the  M. bovis  samples ranged from 0.0379 to 0.4285, while for  M. bovoculi  the dissimilarities ranged from zero to 0.7297. Alternatively, based on sequencing analyses of the 16S-23S intergenic region,  M. bovis  and  M. bovoculi  isolates were grouped into the same two different clades, but it was not possible to differentiate between isolates within clades. PCR techniques were demonstrated to be a satisfactory tool to unravel the genetic variability among  Moraxella  spp., while sequencing of the 16S-23S intergenic region was only able to differentiate two species of the  Moraxella  genus. Despite sampling geographically close regions, we demonstrate considerable genetic diversity in  M. bovis  and  M. bovoculi  strains and genetically distinct  M. bovis  strains co-infecting the same animal.

genetics and molecular biology

Genetic differences among Moraxella bovis and Moraxella bovoculi isolates from infectious bovine keratoconjunctivitis (IBK) outbreaks in southern Brazil