Impact of salinity on Streptococcus agalactiae and health parameters of Oreochromis niloticus during streptococcosis outbreaks
S. agalactiae infection is one of the most important bacterial diseases imparting mass mortality in the aquaculture sector, worldwide. It is responsible for posing both economic burdens and risks of cross-infectivity and zoonotic transmission. In this aspect, this study examined the virulence gene p...
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Elsevier
2024-12-01
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| Series: | The Microbe |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2950194624001341 |
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| author | Rajan Preenanka Muhammed P. Safeena Basura Vidhya TG Sumithra |
| author_facet | Rajan Preenanka Muhammed P. Safeena Basura Vidhya TG Sumithra |
| author_sort | Rajan Preenanka |
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| description | S. agalactiae infection is one of the most important bacterial diseases imparting mass mortality in the aquaculture sector, worldwide. It is responsible for posing both economic burdens and risks of cross-infectivity and zoonotic transmission. In this aspect, this study examined the virulence gene profiles, molecular serotyping and pathogenicity of S. agalactiae strains isolated from tilapia farms in Kerala, India in 2022. Following sample collection and processing, three S. agalactiae strains (KSA/01, KSA/02, and KSA/03) were isolated and confirmed the bacterial identity using 16S rRNA sequencing. In pathogenicity test, the LD50 of the S. agalactiae was found to be 1 × 106 CFU/ml. An increase in the salinity was found to affect the pathogenicity of S. agalactiae as well as the hematological and serological profile of tilapia. Thus the presence of S. agalactiae, a highly virulent and zoonotic pathogen in tilapia farms, underscores the imperative of continuous monitoring in aquaculture facilities. |
| format | Article |
| id | doaj-art-ba595c41c1df4f69bcc3129fdb1c7829 |
| institution | OA Journals |
| issn | 2950-1946 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | The Microbe |
| spelling | doaj-art-ba595c41c1df4f69bcc3129fdb1c78292025-08-20T01:57:55ZengElsevierThe Microbe2950-19462024-12-01510016710.1016/j.microb.2024.100167Impact of salinity on Streptococcus agalactiae and health parameters of Oreochromis niloticus during streptococcosis outbreaksRajan Preenanka0Muhammed P. Safeena1Basura Vidhya2TG Sumithra3Faculty of Ocean Science and Technology (FOST), Kerala University of Fisheries and Ocean Studies (KUFOS), Panangad, Kochi, Kerala 682 506, IndiaDepartment of Aquatic Animal Health Management, Faculty of Fisheries Science, Kerala University of Fisheries and Ocean Studies (KUFOS), Panangad, Kochi, Kerala 682 506, India; Corresponding author.Department of Aquatic Animal Health Management, Faculty of Fisheries Science, Kerala University of Fisheries and Ocean Studies (KUFOS), Panangad, Kochi, Kerala 682 506, IndiaMarine Biotechnology, Fish Nutrition, and Health Division, ICAR-Central Marine Fisheries Research Institute (ICAR-CMFRI), Post Box No. 1603, Ernakulam, Kochi, Kerala 682 018, IndiaS. agalactiae infection is one of the most important bacterial diseases imparting mass mortality in the aquaculture sector, worldwide. It is responsible for posing both economic burdens and risks of cross-infectivity and zoonotic transmission. In this aspect, this study examined the virulence gene profiles, molecular serotyping and pathogenicity of S. agalactiae strains isolated from tilapia farms in Kerala, India in 2022. Following sample collection and processing, three S. agalactiae strains (KSA/01, KSA/02, and KSA/03) were isolated and confirmed the bacterial identity using 16S rRNA sequencing. In pathogenicity test, the LD50 of the S. agalactiae was found to be 1 × 106 CFU/ml. An increase in the salinity was found to affect the pathogenicity of S. agalactiae as well as the hematological and serological profile of tilapia. Thus the presence of S. agalactiae, a highly virulent and zoonotic pathogen in tilapia farms, underscores the imperative of continuous monitoring in aquaculture facilities.http://www.sciencedirect.com/science/article/pii/S2950194624001341S. agalactiaeStreptococcosisTilapia aquacultureMolecular serotypingLD50Pathogenicity |
| spellingShingle | Rajan Preenanka Muhammed P. Safeena Basura Vidhya TG Sumithra Impact of salinity on Streptococcus agalactiae and health parameters of Oreochromis niloticus during streptococcosis outbreaks The Microbe S. agalactiae Streptococcosis Tilapia aquaculture Molecular serotyping LD50 Pathogenicity |
| title | Impact of salinity on Streptococcus agalactiae and health parameters of Oreochromis niloticus during streptococcosis outbreaks |
| title_full | Impact of salinity on Streptococcus agalactiae and health parameters of Oreochromis niloticus during streptococcosis outbreaks |
| title_fullStr | Impact of salinity on Streptococcus agalactiae and health parameters of Oreochromis niloticus during streptococcosis outbreaks |
| title_full_unstemmed | Impact of salinity on Streptococcus agalactiae and health parameters of Oreochromis niloticus during streptococcosis outbreaks |
| title_short | Impact of salinity on Streptococcus agalactiae and health parameters of Oreochromis niloticus during streptococcosis outbreaks |
| title_sort | impact of salinity on streptococcus agalactiae and health parameters of oreochromis niloticus during streptococcosis outbreaks |
| topic | S. agalactiae Streptococcosis Tilapia aquaculture Molecular serotyping LD50 Pathogenicity |
| url | http://www.sciencedirect.com/science/article/pii/S2950194624001341 |
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