Streptococcosis contributed to higher mortality after salt toxicosis in a Specific Pathogen Free breeder flock

Document Type : Case Study

Authors

Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension (AREEO), Karaj, Iran

10.22069/psj.2026.24176.2434

Abstract

An outbreak of sudden death occurred in a research-specific pathogen-free breeder layer flock. Following the report of such a drastic loss in the flock, a comprehensive investigation was conducted to identify the causative agent of the event, including a review of history and clinical signs, as well as serology and postmortem examination. According to the serology results, highly pathogenic avian influenza and virulent Newcastle disease were not detected. Gross lesions and history indicated a toxic condition, and the gross examination was consistent with salt poisoning, but the condition worsened due to a second opportunistic pathogen. In bacterial culture of internal organs and Gram staining, Gram-positive cocci in pairs or chains were identified. Molecular investigations detected Streptococcus gallolyticus. It can be concluded that ignorance of salt balance in the diet could lead to salt poisoning and suppression of the immune system. Following toxicosis, opportunistic bacterial growth can occur rapidly, leading to septicemia in chicken flocks.

Keywords

References

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Poultry Science Journal
Volume 14, Issue 2
November 2026
Pages 145-148

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