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Egyptian Journal of Aquatic Biology and Fisheries
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et al., D. (2025). Evaluation of pH Inactivated Vaccine for Aeromonas hydrophila Infection in the Nile Tilapia (Oreochromis niloticus L.). Egyptian Journal of Aquatic Biology and Fisheries, 29(3), 987-998. doi: 10.21608/ejabf.2025.429329
de Guzman et al.. "Evaluation of pH Inactivated Vaccine for Aeromonas hydrophila Infection in the Nile Tilapia (Oreochromis niloticus L.)". Egyptian Journal of Aquatic Biology and Fisheries, 29, 3, 2025, 987-998. doi: 10.21608/ejabf.2025.429329
et al., D. (2025). 'Evaluation of pH Inactivated Vaccine for Aeromonas hydrophila Infection in the Nile Tilapia (Oreochromis niloticus L.)', Egyptian Journal of Aquatic Biology and Fisheries, 29(3), pp. 987-998. doi: 10.21608/ejabf.2025.429329
et al., D. Evaluation of pH Inactivated Vaccine for Aeromonas hydrophila Infection in the Nile Tilapia (Oreochromis niloticus L.). Egyptian Journal of Aquatic Biology and Fisheries, 2025; 29(3): 987-998. doi: 10.21608/ejabf.2025.429329

Evaluation of pH Inactivated Vaccine for Aeromonas hydrophila Infection in the Nile Tilapia (Oreochromis niloticus L.)

Article 60, Volume 29, Issue 3, May and June 2025, Page 987-998  XML PDF (364.8 K)
DOI: 10.21608/ejabf.2025.429329
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Author
de Guzman et al.
Abstract
The study investigated the efficacy of a pH inactivated vaccine against Aeromonas hydrophila in the juvenile Nile tilapia (Oreochromis niloticus L.). The inactivated vaccine was developed by treating the bacterial suspension with sodium hydroxide to raise the pH to 10.0, followed by readjustment to neutral pH, and finally formaldehyde treatment. Vaccination was administered via intraperitoneal injection, and fish were subsequently challenged with live A. hydrophila to assess the vaccine's protective efficacy. Clinical observations revealed no mortality during the acclimatization phase, however, signs of infection emerged in non-vaccinated group after bacterial exposure. The computed 100% relative percentage survival (RPS) in the vaccinated and challenged group underscores the vaccine's effectiveness. Thus, the study concludes that the pH inactivated vaccine provides significant protection against A. hydrophila, presenting a viable strategy for enhancing disease resistance in aquaculture settings.
Keywords
Aeromonas hydrophila; pH manipulation; Inactivated vaccine; The Nile tilapia; Relative percent survival
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