Pathological Changes in Red Tilapias (Oreochromis spp.) Naturally Infected by Streptococcus agalactiae

Zamri‐Saad, Mohd; Amal, Mohammad Noor Azmai; Siti-Zahrah, A.

doi:10.1016/j.jcpa.2010.01.020

Cited by 77 publications

(65 citation statements)

References 4 publications

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“…Myositis of the skeletal muscles was observed, and this was also reported in the case of S. iniae infection (Lahav et al, 2004). The presence of bacterial aggregations suggestive of streptococci was observed in the histological sections, which was consistent with the results obtained by Zamri-Saad et al (2010) in red tilapia naturally infected by S. agalactiae. This might also indicate the resistance of bacteria to fish defence mechanisms and their role in overwhelming the capacity of the immune system (Chen et al, 2007).…”

Section: Acta Veterinaria Hungarica 65 2017supporting

confidence: 86%

Rapid identification of pathogenic streptococci isolated from moribund red tilapia (Oreochromis spp.)

Abdelsalam

Elgendy

Shaalan

et al. 2017

Acta Veterinaria Hungarica

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Accurate and rapid identification of bacterial pathogens of fish is essential for the effective treatment and speedy control of infections. Massive mortalities in market-sized red tilapia (Oreochromis spp.) were noticed in mariculture concrete ponds in northern Egypt. Histopathological examination revealed marked congestion in the central vein of the liver with the presence of bacterial aggregates inside the lumen and in the vicinity of the central vein. A total of 12 isolates of streptococci were obtained from the moribund fish. This study documented the ability of the MicroSeq 500 16S bacterial sequencing method to accurately identify Streptococcus agalactiae and S. dysgalactiae mixed infections from moribund red tilapia that were difficult to be recognised by the commercial biochemical systems. The continuously decreasing cost of the sequencing technique should encourage its application in routine diagnostic procedures.

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Section: Acta Veterinaria Hungarica 65 2017supporting

confidence: 86%

Rapid identification of pathogenic streptococci isolated from moribund red tilapia (Oreochromis spp.)

Abdelsalam

Elgendy

Shaalan

et al. 2017

Acta Veterinaria Hungarica

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“…Apesar da patogenia e achados de necropsia provocada pela infecção por S. agalactiae em tilápias ainda não estar totalmente caracterizada, as alterações iniciais em peixes infectados naturalmente foram observadas pela associação da presença das colônias bacterianas e exotoxinas com as lesões do fígado, baço, rins e cérebro (CHEN et al, 2007;SUANYUK et al, 2008;ZAMRI-SAAD et al, 2010).…”

Section: Resultsunclassified

Isolamento de Streptococcus agalactiae em diferentes órgãos de tilápias do nilo (Oreochromis niloticus) criadas em tanques-rede

Marcusso¹,

Eto²,

Claudiano³

et al. 2015

Biosci. J.

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RESUMO:A estreptococose é uma das principais causas de mortalidade na criação de tilápias no Brasil, causando grandes perdas econômicas. Assim, o estudo objetivou determinar a frequência de isolamento e identificação por PCR de Streptococcus agalactiae em diferentes órgãos de tilápias do Nilo (Oreochromis niloticus) naturalmente infectadas, oriundas de oito pisciculturas da região norte do estado do Paraná que apresentavam sinais clínicos característicos de infecção estreptocócica. Para tanto, coletaram-se amostras de sangue e fragmentos de rim, fígado, baço, coração e encéfalo. Essas foram semeadas em meio ágar infusão de cérebro e coração (BHI) adicionado 5% de sangue de ovino e incubados à 29ºC, durante 7 dias em aerofília. Após o crescimento bacteriano e a partir das características macro e microscópicas, foram selecionadas colônias compatíveis com as do gênero Streptococcus sp.. As espécies foram identificadas através de PCR e confirmadas por meio do sequenciamento do gene 16S rDNA. Os resultados demonstraram que em tilápias do Nilo infectadas com S. agalactiae, o isolamento é mais frequente em encéfalo, rim e fígado em ordem decrescente.

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“…In addition, the most consistent pathological changes in tilapia infected by Streptococcus agalactiae were marked congestion of internal organs, particularly the liver, spleen and kidneys24, and interestingly the main entry site of S. agalactiae in tilapia was the gastrointestinal epithelium2, thus fish intestinal mucus seems to play an important defensive role. Therefore, tilapias infected by S. agalactiae were used as the animal model to study the gut-liver immunity in fish.…”

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confidence: 96%

Fish gut-liver immunity during homeostasis or inflammation revealed by integrative transcriptome and proteome studies

Song

Wang

et al. 2016

Sci Rep

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The gut-associated lymphoid tissue, connected with liver via bile and blood, constructs a local immune environment of both defense and tolerance. The gut-liver immunity has been well-studied in mammals, yet in fish remains largely unknown, even though enteritis as well as liver and gallbladder syndrome emerged as a limitation in aquaculture. In this study, we performed integrative bioinformatic analysis for both transcriptomic (gut and liver) and proteomic (intestinal mucus and bile) data, in both healthy and infected tilapias. We found more categories of immune transcripts in gut than liver, as well as more adaptive immune in gut meanwhile more innate in liver. Interestingly reduced differential immune transcripts between gut and liver upon inflammation were also revealed. In addition, more immune proteins in bile than intestinal mucus were identified. And bile probably providing immune effectors to intestinal mucus upon inflammation was deduced. Specifically, many key immune transcripts in gut or liver as well as key immune proteins in mucus or bile were demonstrated. Accordingly, we proposed a hypothesized profile of fish gut-liver immunity, during either homeostasis or inflammation. Current data suggested that fish gut and liver may collaborate immunologically while keep homeostasis using own strategies, including potential unique mechanisms.

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Pathological Changes in Red Tilapias (Oreochromis spp.) Naturally Infected by Streptococcus agalactiae

Cited by 77 publications

References 4 publications

Rapid identification of pathogenic streptococci isolated from moribund red tilapia (Oreochromis spp.)

Rapid identification of pathogenic streptococci isolated from moribund red tilapia (Oreochromis spp.)

Isolamento de Streptococcus agalactiae em diferentes órgãos de tilápias do nilo (Oreochromis niloticus) criadas em tanques-rede

Fish gut-liver immunity during homeostasis or inflammation revealed by integrative transcriptome and proteome studies

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