Retrospective identification of bacterial depository revealed that Streptococcus iniae was responsible for some of the Streptococcosis cases in cultured red tilapia in Malaysia since 2006

Siti Zahrah Abdullah, . and Mohd Syafiq Mohammad Ridzuan, . and Mohd Firdaus Nawi, . and Mohd Zamri-Saad, . and Siti Hawa Mohamad Ali, . and Mohammad Noor Azmai Amal, . and Nur Nazifah Mansor, . Retrospective identification of bacterial depository revealed that Streptococcus iniae was responsible for some of the Streptococcosis cases in cultured red tilapia in Malaysia since 2006. pp. 231-238. ISSN 1511-3701

This paper reports the identification of Streptococcus iniae from a large collection of isolates previously identified as Streptococcus sp. Lactococcus lactis subsp. lactis or Leuconostoc sp. A total of 204 bacterial isolates recovered either from the brain eye or kidney of red tilapias in previous disease outbreaks and disease monitoring in Malaysia from 2006 to 2008 were used. PCR identification revealed that 34 (16.7) of the isolates were confirmed as S. iniae. Our records showed that S. iniae-infected fish exhibited lethargy exophthalmia and erratic swimming patterns. Pathological lesions including generalised congestion of the internal organs splenic infarction with soft and oedematous brain. Histopathological examination revealed multifocal encephalitis as one of the major findings. However 44 and 26.5 of the tilapias from which S. iniae was isolated did not manifest any clinical sign and pathological lesion respectively. This study revealed that S. iniae was responsible for streptococcosis in cultured red tilapia in Malaysia since 2006.

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Abstract

This paper reports the identification of Streptococcus iniae from a large collection of isolates previously identified as Streptococcus sp. Lactococcus lactis subsp. lactis or Leuconostoc sp. A total of 204 bacterial isolates recovered either from the brain eye or kidney of red tilapias in previous disease outbreaks and disease monitoring in Malaysia from 2006 to 2008 were used. PCR identification revealed that 34 (16.7) of the isolates were confirmed as S. iniae. Our records showed that S. iniae-infected fish exhibited lethargy exophthalmia and erratic swimming patterns. Pathological lesions including generalised congestion of the internal organs splenic infarction with soft and oedematous brain. Histopathological examination revealed multifocal encephalitis as one of the major findings. However 44 and 26.5 of the tilapias from which S. iniae was isolated did not manifest any clinical sign and pathological lesion respectively. This study revealed that S. iniae was responsible for streptococcosis in cultured red tilapia in Malaysia since 2006.

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Item Type:	Article
AGROVOC Term:	Streptococcus
AGROVOC Term:	Isolation of microorganisms
AGROVOC Term:	Identification
AGROVOC Term:	Polymerase chain reaction
AGROVOC Term:	Tilapia
AGROVOC Term:	Oreochromis (=tilapia) spp
AGROVOC Term:	Animal diseases
AGROVOC Term:	Lesions
AGROVOC Term:	Encephalitis
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9085

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