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Evidence of vertical transmission and tissue tropism of Streptococcosis from naturally infected red tilapia (Oreochromis spp.)
Pradeep P.J. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Evidence of vertical transmission and tissue tropism of Streptococcosis from naturally infected red tilapia (Oreochromis spp.)
ผู้แต่ง / หัวหน้าโครงการ (EN): Pradeep P.J.
บทคัดย่อ (EN): Streptococcosis is a highly problematic disease in the aquaculture of freshwater fishes, especially for tilapia. The possibility of vertical transmission of streptococcosis and the pattern of tissue tropism of this pathogen in various organs was examined in red tilapia (Oreochromis sp.). Healthy broodstock without any clinical signs of Streptococcus spp. were selected from a farm earlier reported to have the disease and a total of 10 pairs were forced spawned to provide samples of gametes and progeny for pathogen testing. A colorimetric LAMP assay was used to confirm whether the bacterial pathogens Streptococcus. agalactiae and Streptococcus. iniae was present in samples of milt, unfertilized eggs, fertilized eggs, and offspring at various stages of development, as well as internal organs of broodstock (reproductive organs, gill, liver, spleen, kidney and brain) as well as samples of water from culture systems. The majority of samples of milt (9/10) and unfertilized eggs (7/10) collected from the broodstock were infected with S. iniae at the time of spawning and was transmitted to all of their offspring. Nevertheless, when the same samples of gametes were analyzed for S. agalactiae, they were all found to be negative but the pathogen was found to be present in some 10-day-old larval offspring (4/10). However, when the pathogenic presence was analyzed from the reproductive organs of the parents, both S. agalactiae (11/20) and S. iniae (18/20) bacterium were common. Although, all broodstock were asymptomatic, almost all broodstock harboured the bacteria in many organs. Confirmation of vertical transmission of streptococcosis in tilapia means that intergenerational break cannot be used as a reliable and simple means of reducing or eliminating the prevalence of these difficult pathogens in aquaculture stock. © 2015 The Authors. Published by Elsevier B.V.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): https://www.scopus.com/inward/record.uri?eid=2-s2.0-84952837519&doi=10.1016%2fj.aqrep.2015.12.002&partnerID=40&md5=eab68c8ab7c22081a1a8f389425c2274
เผยแพร่โดย (EN): มหาวิทยาลัยมหิดล
คำสำคัญ (EN): Vertical transmissio
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยมหิดล
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Evidence of vertical transmission and tissue tropism of Streptococcosis from naturally infected red tilapia (Oreochromis spp.)
Pradeep P.J.
มหาวิทยาลัยมหิดล
ไม่ระบุวันที่เผยแพร่
Vertical transmission and concurrent infection of multiple bacterial pathogens in naturally infected red tilapia (Oreochromis spp.) Francisella noatunensis subsp. orientalis, an emerging bacterial pathogen affecting cultured red tilapia (Oreochromis sp.) in Thailand Hahella chejuensis is the etiological agent of a novel red egg disease in tilapia (Oreochromis spp.) hatcheries in Thailand Natural occurrence of edwardsiellosis caused by Edwardsiella ictaluri in farmed hybrid red tilapia (Oreochromis sp.) in Southeast Asia การศึกษาความหลากหลายทางพันธุกรรมของ Tilapia lake virus (TiLV) และการพัฒนาวิธีตรวจสายพันธุ์ของไวรัสอย่างจำเพาะ Optimal conditions for cold-shock induction of triploidy in red tilapia การพัฒนาชุดตรวจแลมป์นาโนโกลด์สำเร็จรูปเพื่อการตรวจหาเชื้อ Tilapia Lake Virus ที่ก่อโรคในปลานิลและปลานิลแดง Duplex PCR assay and in situ hybridization for detection of Francisella spp. and Francisella noatunensis subsp. orientalis in red tilapia Naturally concurrent infections of bacterial and viral pathogens in disease outbreaks in cultured Nile tilapia (Oreochromis niloticus) farms Virulence assay of rhizoid and non-rhizoid morphotypes of Flavobacterium columnare in red tilapia, Oreochromis sp., fry
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