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Streptococcus suis in Brazil: Genotypic, Virulence, and Resistance Profiling of Strains Isolated from Pigs between 2001 and 2016

Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo 01000-000, Brazil
Companhia Ambiental do Estado de São Paulo (CETESB), São Paulo 01000-000, Brazil
Universidade Paulista-UNIP, São Paulo 01000-000, Brazil
Author to whom correspondence should be addressed.
Pathogens 2020, 9(1), 31;
Received: 30 November 2019 / Revised: 14 December 2019 / Accepted: 27 December 2019 / Published: 28 December 2019
Streptococcus suis remains an important challenge for the worldwide swine industry. Considering that Brazil is a major pork producer and exporter, proper monitoring of the pathogen and resistance rates are required. We present here the characterization of Brazilian S. suis strains isolated over a 15 year period by pulsed-field gel electrophoresis (PFGE) typing, capsular, virulence, and antimicrobial resistance profiling. Serotype prevalence revealed a predominance of serotype 2/½ followed by 3, 7, 1/14, 6, 8, 18, 28, and 27; the latter had not yet been reported in Brazil. Resistance profiling enabled the differentiation of nine profiles presenting resistance to three and up to eight antimicrobial classes. Even though an association between the most resistant strains and isolation year starting from 2009 was observed, a high frequency of multidrug-resistant strains isolated from 2001 to 2003 was also detected. This suggests that despite the isolation period, S. suis strains already presented high resistance selection pressure. A slight association of serotype 2/½ with some virulence profiles and PFGE pulsotypes was also identified. Nevertheless, no clonal dispersion or persistency of clones over the analyzed years and herds was detected. View Full-Text
Keywords: Streptococcus suis; serotyping; antimicrobial resistance; PFGE; Brazil Streptococcus suis; serotyping; antimicrobial resistance; PFGE; Brazil
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Matajira, C.E.C.; Moreno, L.Z.; Poor, A.P.; Gomes, V.T.M.; Dalmutt, A.C.; Parra, B.M.; Oliveira, C.H.; Barbosa, M.R.F.; Sato, M.I.Z.; Calderaro, F.F.; Moreno, A.M. Streptococcus suis in Brazil: Genotypic, Virulence, and Resistance Profiling of Strains Isolated from Pigs between 2001 and 2016. Pathogens 2020, 9, 31.

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