Aquaculture International

, Volume 27, Issue 6, pp 1787–1800 | Cite as

Autogenous bacterins cross-protection as a trial for Streptococcosis control in Oreochromis niloticus

  • Amany M. DiabEmail author
  • R. H. Khalil
  • M. Khallaf


The present work investigated experimentally a rapid, effective and inexpensive control to streptococcosis, and the role of Streptococcus iniae as a major cause for mass mortalities of cultured Oreochromis niloticus in Kafrelsheikh, Egypt, in the summer of 2017; mass mortality was associated with poor water quality, and cultured naturally infected O. niloticus showed corneal opacity, congestion, and deep haemorrhagic ulceration in the dorsal region. S. iniae was identified as a causative agent by traditional and PCR techniques. The highest incidence of S. iniae was in the liver. Choosing vaccination as a control was experimentally investigated; the superiority of Streptococcus agalactiae FKC bacterin was related to the antibody titre, which was higher than S. iniae bacterin. The relative level of protection values were 79% and 23% in fish challenged with S. agalactiae and vaccinated with FKC of either S. agalactiae or S. iniae, respectively. These values were 56% and 74% in fish challenged with S. iniae and vaccinated with FKC of either S. agalactiae or S.i niae, respectively. In conclusions, autogenous bacterins of S. agalactiae or S.iniae induced cross-protection against S. agalactiae and S. iniae, in O. niloticus. The protection was superior to a S. agalactiae FKC vaccine, which could be a useful means for the prevention and control of streptococcosis.


PCR Streptococcosis Tilapia Vaccine Water quality 



Formalin-killed cells


The median lethal dose

O. niloticus

Oreochromis niloticus

S. agalactiae

Streptococcus agalactiae

S. iniae

Streptococcus iniae



The authors are grateful to Aquaculture engineering Master Ghanem, who has a private fish farm.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All applicable international guidelines for the care and use of animals were followed by the authors.


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Aquatic Microbiology, Faculty of Aquatic and Fisheries SciencesKafrelsheikh UniversityKafr El-SheikhEgypt
  2. 2.Department of Poultry and Fish Diseases, Faculty of Veterinary MedicineAlexandria UniversityAlexandriaEgypt
  3. 3.Department of Aquatic Animal Medicine and Management Department, Faculty of Veterinary MedicineSadat City UniversitySadat CityEgypt

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