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acute hepatopancreatic necrosis syndrome

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https://www.readbyqxmd.com/read/27594170/impact-of-farm-management-on-expression-of-early-mortality-syndrome-acute-hepatopancreatic-necrosis-disease-ems-ahpnd-on-penaeid-shrimp-farms-in-thailand
#1
V Boonyawiwat, T Patanasatienkul, J Kasornchandra, C Poolkhet, S Yaemkasem, L Hammell, J Davidson
Asian shrimp farming industry has experienced massive production losses due to a disease caused by toxins of Vibrio bacteria, known as early mortality syndrome/acute hepatopancreatic necrosis disease (EMS/AHPND) for the last 5 years. The disease can cause up to 100% cumulative pond mortality within a week. The objective of this study was to identify factors associated with AHPND occurrence on shrimp farms. A case-control study was carried out on shrimp farms in four provinces of Thailand. Factors related to farm characteristics, farm management, pond and water preparation, feed management, post-larvae (PL) shrimp and stock management were evaluated...
September 5, 2016: Journal of Fish Diseases
https://www.readbyqxmd.com/read/27570736/draft-genome-sequence-of-pathogenic-bacteria-vibrio-parahaemolyticus-strain-ba94c2-associated-with-acute-hepatopancreatic-necrosis-disease-isolate-from-south-america
#2
Leda Restrepo, Bonny Bayot, Irma Betancourt, Andres Pinzón
Vibrio parahaemolyticus is a pathogenic bacteria which has been associated to the early mortality syndrome (EMS) also known as hepatopancreatic necrosis disease (AHPND) causing high mortality in shrimp farms. Pathogenic strains contain two homologous genes related to insecticidal toxin genes, PirA and PirB, these toxin genes are located on a plasmid contained within the bacteria. Genomic sequences have allowed the finding of two strains with a divergent structure related to the geographic region from where they were found...
September 2016: Genomics Data
https://www.readbyqxmd.com/read/27003504/sensitive-visual-detection-of-ahpnd-bacteria-using-loop-mediated-isothermal-amplification-combined-with-dna-functionalized-gold-nanoparticles-as-probes
#3
Narong Arunrut, Jantana Kampeera, Sarawut Sirithammajak, Piyachat Sanguanrut, Porranee Proespraiwong, Rungkarn Suebsing, Wansika Kiatpathomchai
Acute hepatopancreatic necrosis disease (AHPND) is a component cause of early mortality syndrome (EMS) of shrimp. In 2013, the causative agent was found to be unique isolates of Vibrio parahaemolyticus (VPAHPND) that contained a 69 kbp plasmid (pAP1) carrying binary Pir-like toxin genes PirvpA and PirvpB. In Thailand, AHPND was first recognized in 2012, prior to knowledge of the causative agent, and it subsequently led to a precipitous drop in shrimp production. After VPAHPND was characterized, a major focus of the AHPND control strategy was to monitor broodstock shrimp and post larvae for freedom from VPAHPND by nucleic acid amplification methods, most of which required use of expensive and sophisticated equipment not readily available in a shrimp farm setting...
2016: PloS One
https://www.readbyqxmd.com/read/26555534/prevalence-and-antimicrobial-resistance-of-vibrio-spp-in-retail-and-farm-shrimps-in-ecuador
#4
L Sperling, T Alter, S Huehn
The aim of this study was to investigate the prevalence of Vibrio spp. in shrimp at retail and in shrimp farms in Ecuador and to determine the antimicrobial agent resistance patterns of farm isolates. The presence of genes linked to early mortality syndrome (EMS) or acute hepatopancreatic necrosis disease (AHPND) also was evaluated. Vibrio spp. were isolated from retail shrimps in Cuenca, Ecuador, and farm shrimps originating from provinces El Oro and Guayas, Ecuador. A total of 229 shrimp samples were collected, of which 71 originated from retail markets in Cuenca and 158 came from shrimp farms...
November 2015: Journal of Food Protection
https://www.readbyqxmd.com/read/26549178/pathogenesis-of-acute-hepatopancreatic-necrosis-disease-ahpnd-in-shrimp
#5
Hung-Chiao Lai, Tze Hann Ng, Masahiro Ando, Chung-Te Lee, I-Tung Chen, Jie-Cheng Chuang, Rapeepat Mavichak, Sheng-Hsiung Chang, Mi-De Yeh, Yi-An Chiang, Haruko Takeyama, Hiro-o Hamaguchi, Chu-Fang Lo, Takashi Aoki, Han-Ching Wang
Acute hepatopancreatic necrosis disease (AHPND), also called early mortality syndrome (EMS), is a recently emergent shrimp bacterial disease that has resulted in substantial economic losses since 2009. AHPND is known to be caused by strains of Vibrio parahaemolyticus that contain a unique virulence plasmid, but the pathology of the disease is still unclear. In this study, we show that AHPND-causing strains of V. parahaemolyticus secrete the plasmid-encoded binary toxin PirAB(vp) into the culture medium. We further determined that, after shrimp were challenged with AHPND-causing bacteria, the bacteria initially colonized the stomach, where they started to produce PirAB(vp) toxin...
December 2015: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/25667334/photorhabdus-insect-related-pir-toxin-like-genes-in-a-plasmid-of-vibrio-parahaemolyticus-the-causative-agent-of-acute-hepatopancreatic-necrosis-disease-ahpnd-of-shrimp
#6
Jee Eun Han, Kathy F J Tang, Loc H Tran, Donald V Lightner
The 69 kb plasmid pVPA3-1 was identified in Vibrio parahaemolyticus strain 13‑028/A3 that can cause acute hepatopancreatic necrosis disease (AHPND). This disease is responsible for mass mortalities in farmed penaeid shrimp and is referred to as early mortality syndrome (EMS). The plasmid has a GC content of 45.9% with a copy number of 37 per bacterial cell as determined by comparative quantitative PCR analyses. It consists of 92 open reading frames that encode mobilization proteins, replication enzymes, transposases, virulence-associated proteins, and proteins similar to Photorhabdus insect-related (Pir) toxins...
February 10, 2015: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/25189578/draft-genome-sequences-of-four-strains-of-vibrio-parahaemolyticus-three-of-which-cause-early-mortality-syndrome-acute-hepatopancreatic-necrosis-disease-in-shrimp-in-china-and-thailand
#7
Yi-Ting Yang, I-Tung Chen, Chung-Te Lee, Chien-Yu Chen, Shih-Shun Lin, Lien-I Hor, Ta-Chien Tseng, Yun-Tzu Huang, Kallaya Sritunyalucksana, Siripong Thitamadee, Han-Ching Wang, Chu-Fang Lo
We sequenced four Vibrio parahaemolyticus strains, three of which caused serious acute hepatopancreatic necrosis disease. Sequence analysis of the virulent strains revealed not only genes related to cholera toxin and the type IV pilus/type IV secretion system but also a unique, previously unreported, large extrachromosomal plasmid that encodes a homolog to the insecticidal Photorhabdus insect-related binary toxin PirAB.
2014: Genome Announcements
https://www.readbyqxmd.com/read/25144120/detection-of-acute-hepatopancreatic-necrosis-disease-ahpnd-in-mexico
#8
Linda Nunan, Donald Lightner, Carlos Pantoja, Silvia Gomez-Jimenez
Acute hepatopancreatic necrosis disease (AHPND), which has also been referred to as early mortality syndrome (EMS), initially emerged as a destructive disease of cultured shrimp species in Asia in 2009. The pathogen associated with the disease, Vibrio parahaemolyticus, subsequently spread to the Western Hemisphere and emerged in Mexico in early 2013. The spread to the Western Hemisphere is a major concern to shrimp producers in the region. To date, the only peer-reviewed published method for determining whether mortalities are due to AHPND is through histological examination...
August 21, 2014: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/24911022/white-feces-syndrome-of-shrimp-arises-from-transformation-sloughing-and-aggregation-of-hepatopancreatic-microvilli-into-vermiform-bodies-superficially-resembling-gregarines
#9
Siriporn Sriurairatana, Visanu Boonyawiwat, Warachin Gangnonngiw, Chaowanee Laosutthipong, Jindanan Hiranchan, Timothy W Flegel
Accompanying acute hepatopancreatic necrosis disease (AHPND) in cultivated Asian shrimp has been an increasing prevalence of vermiform, gregarine-like bodies within the shrimp hepatopancreas (HP) and midgut. In high quantity they result in white fecal strings and a phenomenon called white feces syndrome (WFS). Light microscopy (LM) of squash mounts and stained smears from fresh HP tissue revealed that the vermiform bodies are almost transparent with widths and diameters proportional to the HP tubule lumens in which they occur...
2014: PloS One
https://www.readbyqxmd.com/read/24723705/draft-genome-sequences-of-six-strains-of-vibrio-parahaemolyticus-isolated-from-early-mortality-syndrome-acute-hepatopancreatic-necrosis-disease-shrimp-in-thailand
#10
Hidehiro Kondo, Sasiwipa Tinwongger, Porranee Proespraiwong, Rapeepat Mavichak, Sasimanas Unajak, Reiko Nozaki, Ikuo Hirono
Some strains of Vibrio parahaemolyticus cause acute hepatopancreatic necrosis disease (AHPND) in shrimp. We sequenced 3 AHPND and 3 non-AHPND strains and found that all of them lacked the pathogenicity island relevant to human infection. A unique sequence encoding a type IV pilus/type IV secretion system was found in 3 AHPND strains.
2014: Genome Announcements
https://www.readbyqxmd.com/read/24604636/draft-genome-sequence-of-vibrio-parahaemolyticus-strain-m0605-which-causes-severe-mortalities-of-shrimps-in-mexico
#11
Bruno Gomez-Gil, Sonia Soto-Rodríguez, Rodolfo Lozano, Miguel Betancourt-Lozano
Acute hepatopancreatic necrosis disease (AHPND), also known as early mortality syndrome (EMS), causes high mortalities in cultured shrimps in Asia (L. Tran et al., Dis. Aquat. Organ. 105:45-55, 2013, http://dx.doi.org/10.3354/dao02621). Here, we report the draft genome sequence of one Mexican strain of Vibrio parahaemolyticus that causes similar clinical signs in diseased shrimps.
2014: Genome Announcements
https://www.readbyqxmd.com/read/23836769/determination-of-the-infectious-nature-of-the-agent-of-acute-hepatopancreatic-necrosis-syndrome-affecting-penaeid-shrimp
#12
Loc Tran, Linda Nunan, Rita M Redman, Leone L Mohney, Carlos R Pantoja, Kevin Fitzsimmons, Donald V Lightner
A new emerging disease in shrimp, first reported in 2009, was initially named early mortality syndrome (EMS). In 2011, a more descriptive name for the acute phase of the disease was proposed as acute hepatopancreatic necrosis syndrome (AHPNS). Affecting both Pacific white shrimp Penaeus vannamei and black tiger shrimp P. monodon, the disease has caused significant losses in Southeast Asian shrimp farms. AHPNS was first classified as idiopathic because no specific causative agent had been identified. However, in early 2013, the Aquaculture Pathology Laboratory at the University of Arizona was able to isolate the causative agent of AHPNS in pure culture...
July 9, 2013: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/22429834/historic-emergence-impact-and-current-status-of-shrimp-pathogens-in-asia
#13
REVIEW
Timothy W Flegel
It is estimated that approximately 60% of disease losses in shrimp aquaculture have been caused by viral pathogens and 20% by bacterial pathogens. By comparison, losses to fungi and parasites have been relatively small. For bacterial pathogens, Vibrio species are the most important while for viral pathogens importance has changed since 2003 when domesticated and genetically selected stocks of the American whiteleg shrimp Penaeus (Litopenaeus) vannamei (Boone 1931) replaced the formerly dominant giant tiger or black tiger shrimp Penaeus (Penaeus) monodon (Fabricius 1798) as the dominant cultivated species...
June 2012: Journal of Invertebrate Pathology
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