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Screening of virulence-associated genes as a molecular typing method for characterization of Streptococcus suis isolates recovered from wild boars and pigs

Investigation published in The Veterinary Journal

March 1st, 2016

Streptococcus suis is an important zoonotic pathogen associated with a wide range of diseases in pigs, but has also been isolated from wild animals such as rabbits and wild boars. In the current study, 126 S. suis isolates recovered from pigs (n = 85) and wild boars (n = 41) were tested by polymerase chain reaction (PCR) for the presence of nine virulence-associated genes. S. suis isolates from wild boars were differentiated by the lower detection rates of the epf, sly, mrp, sao and dltA genes (0%, 2.4%, 2.4%, 4.8% and 21.9%, respectively) compared with the isolates from pigs (56.5%, 75.3%, 56.5%, 88.2.0% and 88.2%, respectively). The differences in the content of these virulence-associated genes were statistically significant (P < 0.05). There was a correlation between the variants saoM and saoL and serotypes 2 and 9, respectively (P < 0.05). Isolates were classified into 31 virulence-associated gene profiles (VPs). Ten VPs were detected among wild boar isolates and 22 VPs among pig isolates, with only two VPs common to wild boars and pigs. The predominant VPs among isolates from wild boars (VP1, VP7) were different from those observed in pig isolates (VP16 and VP26). VP16 was detected exclusively in clinical pig isolates of serotype 9 and VP26 was detected in 71.4% of the serotype 2 clinical pig isolates. Further multilocus sequence typing (MLST) analysis showed a significant correlation association between certain VPs and STs (VP16 and VP17 with ST123 and ST125 and VP26 with ST1). In conclusion, the current study showed that combination of virulence-associated gene profiling and MLST analysis may provide more information of the relatedness of the S. suis strains from different animal species that could be useful for epidemiological purposes




Sanchez V., Fernandez-Garayzabal JF., Dominguez L., Gottschalk M. and Vela AI..




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Screening of virulence-associated genes as a molecular typing method for characterization of Streptococcus suis isolates recovered from wild boars and pigs

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Screening of virulence-associated genes as a molecular typing method for characterization of Streptococcus suis isolates recovered from wild boars and pigs



Participants:

Universidad ComplutenseDepartamento de Sanidad Animal. Facultad de Veterinaria. Universidad Complutense (UCM).

Centre de Recherche en Infectiologie Porcine (CRIP). Faculté de Médicine Vétérinaire. Université de Montréal (UM).

Universidad ComplutenseServicio de Identificación y Caracterización Microbiana (ICM). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM).







The Veterinary Journal
FACTOR YEAR Q
1.802 2016

NLMID: 9706281

PMID: 26831161

ISSN: 1090-0233



TITLE: Screening of virulence-associated genes as a molecular typing method for characterization of Streptococcus suis isolates recovered from wild boars and pigs


JOURNAL: Vet J


NUMERACIÓN: 209:108-12


AÑO: 2016


PUBLISHER: Elsevier SCI LTD


AUTHORS: Sanchez V., Fernandez-Garayzabal JF., Dominguez L., Gottschalk M. and Vela AI..


2nd
José Francisco Fernández-Garayzabal Fernández
3rd
Lucas Domínguez Rodríguez
Last
Ana Isabel Vela Alonso

DOI: https://doi.org/10.1016/j.tvjl.2015.11.007


CITE THIS PUBLICATION:

Sanchez V., Fernandez-Garayzabal JF., Dominguez L., Gottschalk M. and Vela AI. Screening of virulence-associated genes as a molecular typing method for characterization of Streptococcus suis isolates recovered from wild boars and pigs. The Veterinary Journal. 209:108-12. 2016. (A). ISSN: 1090-0233. DOI: 10.1016/j.tvjl.2015.11.007


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