Abstract
In 2016 and 2017, we characterized outbreaks caused by Streptococcus agalactiae serotype III sequence type (ST) 283 in Nile tilapia farms in Brazil. Whole-genome multilocus sequence typing clustered the fish isolates together with the zoonotic ST283 and other STs related to cases in humans, frogs, dogs, cattle, and dolphins.
Highlights
In 2016 and 2017, we characterized outbreaks caused by Streptococcus agalactiae serotype III sequence type (ST) 283 in Nile tilapia farms in Brazil
We described the emergence of GBS ST (GBS serotype III ST283) associated with the Nile tilapia infection in Brazil
Based on import records of live Nile tilapia from Singapore to Brazil in 2014 and our analyses (ERIC-PCR, multilocus sequence typing (MLST), and whole-genome MLST (wgMLST)), it is possible that this genotype was introduced into the country with the recently imported fish
Summary
In 2016 and 2017, we characterized outbreaks caused by Streptococcus agalactiae serotype III sequence type (ST) 283 in Nile tilapia farms in Brazil. Two case–control studies determined that GBS serotype III sequence type (ST) 283 was associated with disease in 9 [2] and 19 [3] patients in that country at different times during 2015. This specific ST has been identified as a zoonotic agent to humans and already has been detected in freshwater fish dishes from food stalls in Singapore [1]; consumption of such fish dishes led to increased cases during that year. Our objective was to evaluate, by molecular and genomic approaches, the GBS serotype III isolates from outbreaks in Nile tilapia farms in Brazil. We confirmed GBS as the principal pathogen associated with the deaths during all the outbreaks (Table)
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