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1.
J Virol Methods ; 323: 114840, 2024 Jan.
Article in English | MEDLINE | ID: mdl-37989459

ABSTRACT

Decapod Penstylhamaparvovirus 1, commonly known as infectious hypodermal and hematopoietic necrosis virus (IHHNV), remains an economically important viral pathogen for penaeid shrimp aquaculture due to its effects on growth performance. The World Organization for Animal Health (WOAH, Paris, France) recommended methods for the detection of IHHNV include both conventional and real-time PCR. However, published reports and anecdotal evidence suggest the occurrence of non-specific amplifications when testing for IHHNV using the WOAH protocols. Studies were designed to develop a sensitive, robust TaqMan PCR method for detection of IHHNV in the three commercially important penaeid shrimp: Penaeus vannamei, P. monodon and P. stylirostris. We compared the performance of the WOAH-recommended real-time PCR method to several published as well as in-house designed primer/probe sets spanning the entire genome of IHHNV. Our results show that (1) more than one primer/ probe set is needed when testing for the infectious form of IHHNV in all three species of shrimp and (2) primer pairs qIH-Fw/qIH-Rv and 3144F/ 3232R have diagnostic characteristics that would enable IHHNV detection in all three shrimp species. These findings are valuable for a large-scale screening of shrimp using a TaqMan real-time PCR assay.


Subject(s)
Densovirinae , Penaeidae , Animals , Densovirinae/genetics , Real-Time Polymerase Chain Reaction/methods
2.
PNAS Nexus ; 2(9): pgad278, 2023 Sep.
Article in English | MEDLINE | ID: mdl-37693213

ABSTRACT

Viral disease pandemics are a major cause of economic losses in crustacean farming worldwide. While RNA interference (RNAi)-based therapeutics have shown promise at a laboratory scale, without an effective oral delivery platform, RNA-based therapy will not reach its potential against controlling viral diseases in crustaceans. Using a reverse-engineered shrimp RNA virus, Macrobrachium rosenbergii nodavirus (MrNV), we have developed a shrimp viral vector for delivering an engineered RNA cargo. By replacing the RNA-dependent RNA polymerase (RdRp) protein-coding region of MrNV with a cargo RNA encoding green fluorescent protein (GFP) as a proof-of-concept, we generated a replication-incompetent mutant MrNV(ΔRdRp) carrying the GFP RNA cargo resulting in MrNV(ΔRdRp)-GFP. Upon incorporating MrNV(ΔRdRp)-GFP in the diet of the marine Pacific white shrimp (Penaeus vannamei), MrNV(ΔRdRp) particles were visualized in hemocytes demonstrating successful vector internalization. Fluorescence imaging of hemocytes showed the expression of GFP protein and the MrNV capsid RNA (RNA2) as well as the incorporated GFP RNA cargo. Detection of cargo RNA in hepatopancreas and pleopods indicated the systemic spread of the viral vector. The quantitative load of both the MrNV RNA2 and GFP RNA progressively diminished within 8 days postadministration of the viral vector, which indicated a lack of MrNV(ΔRdRp)-GFP replication in shrimp. In addition, no pathological hallmarks of the wild-type MrNV infection were detected using histopathology in the target tissue of treated shrimp. The data unequivocally demonstrated the successful engineering of a replication-incompetent viral vector for RNA delivery, paving the way for the oral delivery of antiviral therapeutics in farmed crustaceans.

3.
J Invertebr Pathol ; 200: 107968, 2023 09.
Article in English | MEDLINE | ID: mdl-37429540

ABSTRACT

Microsporidia are emerging intracellular parasites of most known animal phyla in all ecological niches. In shrimp aquaculture, the microsporidium Enterocytozoon hepatopenaei (EHP) is a major cause of concern inflicting tremendous losses to shrimp producers in southeast Asia. During a histopathological examination of Penaeus vannamei samples originating in a country from Latin America presenting slow growth, we observed abnormal nuclei in the epithelial cells of the hepatopancreas. A PCR screening of the samples using DNA isolated from paraffin embedded tissues for the SSU rRNA gene of EHP provided a 149 bp amplicon. In situ hybridization using the SSU rRNA gene probe provided a positive signal in the nuclei instead of the cytoplasm. Sequence analysis of the SSU rRNA gene product revealed a 91.3 %, 89.2 % and 85.4 % sequence identity to Enterocytozoon bieneusi, E. hepatopenaei and Enterospora canceri respectively. Furthermore, phylogenetic analysis revealed the newly discovered microsporidium clustered with E. bieneusi. Considering the intranuclear location of the novel microsporidium and the differences in the sequence of the SSU rRNA, we tentatively consider this parasite a new member of the genus Enterospora sp. The pathogenicity and distribution of the shrimp Enterospora sp. are currently unknown. Our future efforts are focused on the characterization and development of diagnostic tools for this parasite to understand if it acts as an emergent pathogen that might require surveillance to prevent its spread.


Subject(s)
Enterocytozoon , Microsporidia, Unclassified , Penaeidae , Animals , Microsporidia, Unclassified/genetics , Penaeidae/parasitology , Latin America , Phylogeny , Enterocytozoon/genetics , RNA, Ribosomal
4.
J Invertebr Pathol ; 196: 107853, 2023 02.
Article in English | MEDLINE | ID: mdl-36396081

ABSTRACT

Here we report for the first time a laboratory challenge model for Enterocytozoon hepatopenaei (EHP) to determine the difference of two Specific Pathogen Free (SPF) lines of Penaeus vannamei shrimp. These lines were experimentally challenged using EHP-infected fecal strings as inoculum. Real-time PCR and histopathology assays were performed to confirm EHP infection and evaluate differences in EHP susceptibility in the two genetic lines screened. Although the histopathology of the hepatopancreas tissue showed EHP lesions in both challenged groups, the histological lesions were more pronounced in one of the SPF lines. Quantitative PCR results revealed that animals displaying less hepatocellular damage have lower EHP load compared to animals displaying more pronounced pathological changes. There was no significant difference in final survival at 36 days post-infection in these lines with survival ranging between 80 and 100%. The data showed that mortality as an endpoint metric is not a suitable parameter to determine genetic susceptibility to EHP. Instead, histopathological changes in hepatopancreas, EHP load of the same tissue, and growth retardation would be better metrics to screen EHP susceptibility in P. vannamei. The results show the feasibility of screening genetic lines of P. vannamei for EHP resistance/tolerance using fecal string as an inoculum and, assessing histopathological changes, EHP load, and weight as indicators of resistance.


Subject(s)
Enterocytozoon , Penaeidae , Animals , Penaeidae/genetics , Feces , Enterocytozoon/genetics , Real-Time Polymerase Chain Reaction
5.
Viruses ; 14(10)2022 10 09.
Article in English | MEDLINE | ID: mdl-36298775

ABSTRACT

The emergence and spread of disease-causing viruses in shrimp aquaculture is not uncommon. Since 2016, unusual mortalities have been affecting the Brazilian shrimp industry and we have associated these unusual mortalities with a novel variant of infectious myonecrosis virus (IMNV). The transcriptome analysis of these diseased shrimp showed an additional divergent viral sequence that we have assigned to the family Solinviviridae. The novel virus has been tentatively termed Penaeus vannamei solinvivirus (PvSV) (GenBank accession: OP265432). The full-length genome of the PvSV is 10.44 kb (excluding the poly A tail) and codes for a polyprotein of 3326 aa. Five conserved domains coding for a helicase, RdRp, calicivirus coat protein, G-patch and tegument protein were identified. The genome organization of the PvSV is similar to other (Nylan deria fulva virus 1) solinvivirus. A unique feature of this virus that differs from other members of the Solinviviridae is the presence of putative nuclear localization signals. The tissue tropism of this virus is wide, infecting cells of the hepatopancreas, gastrointestinal tract, lymphoid organ and muscle tissue. Another unique feature is that it is the only RNA virus of penaeid shrimp that shows a nuclear localization by in situ hybridization. The PvSV has a wide distribution in Brazil and has been found in the states of Maranhão State (Perizes de Baixo), Piaui State (Mexeriqueira), Ceará State (Camocim, Jaguaruana, Aracati and Alto Santo) and Pará State where it has been detected in coinfections with IMNV. The diagnostic methods developed here (real-time RT-PCR and in situ hybridization) are effective for the detection of the pathogen and should be employed to limit its spread. Furthermore, the identification of the PvSV shows the increasing host range of the relatively new family Solinviviridae.


Subject(s)
Penaeidae , RNA Viruses , Animals , Nuclear Localization Signals , RNA Viruses/genetics , RNA-Dependent RNA Polymerase , Polyproteins , Poly A
6.
PLoS One ; 16(12): e0261289, 2021.
Article in English | MEDLINE | ID: mdl-34941926

ABSTRACT

White Feces Syndrome (WFS) is an emergent disease of penaeid shrimp (Penaeus monodon and P. vannamei) that is identified by the presence of floating white fecal strings on pond water in grow-out ponds. Although the clinical manifestations of WFS are well defined, the underling etiology remains obscure. WFS has been associated with several enteric pathogens, including Enterocytozoon hepatopenaei (EHP). The association is based on studies that found areas where WFS has been reported, the prevalence and severity of EHP infection are high. In this study, we describe an experimental reproduction of WFS in P. vannamei pre-infected with EHP and challenged with a unique isolate of Vibrio parahaemolyticus isolated from the gastrointestinal tract of a shrimp displaying WFS. Upon laboratory challenge, shrimp displaying white fecal strings and white discoloration of the gastrointestinal tract were analyzed by histopathology, in-situ hybridization and quantitative PCR. Histological analysis confirmed the lesions of EHP and septic hepatopancreatic necrosis in the hepatopancreas of shrimp exposed to both pathogens. Quantitative PCR showed shrimp infected with both EHP and V. parahaemolyticus had a significantly higher load of EHP compared to shrimp infected with EHP alone. This is the first demonstration of experimental reproduction of WFS under laboratory conditions when animals are infected with EHP and V. parahaemolyticus concurrently. The data revealed a synergistic relation between EHP and V. parahaemolyticus isolate that led to the manifestation of WFS. We propose the gross signs of WFS can be used as an indicator of the presence of EHP infection in association with a particular strain of an enteric Vibrio spp. in countries where EHP is endemic.


Subject(s)
Penaeidae/microbiology , Penaeidae/parasitology , Animals , Aquaculture/methods , Enterocytozoon/pathogenicity , Feces/microbiology , Gastrointestinal Tract , In Situ Hybridization , Models, Animal , Polymerase Chain Reaction , Prevalence , Seafood/microbiology , Vibrio parahaemolyticus/pathogenicity
7.
Front Immunol ; 12: 634152, 2021.
Article in English | MEDLINE | ID: mdl-34054803

ABSTRACT

Acute hepatopancreatic necrosis disease (AHPND) is a lethal disease in marine shrimp that has caused large-scale mortalities in shrimp aquaculture in Asia and the Americas. The etiologic agent is a pathogenic Vibrio sp. carrying binary toxin genes, pirA and pirB in plasmid DNA. Developing AHPND tolerant shrimp lines is one of the prophylactic approaches to combat this disease. A selected genetic line of Penaeus vannamei was found to be tolerant to AHPND during screening for disease resistance. The mRNA expression of twelve immune and metabolic genes known to be involved in bacterial pathogenesis were measured by quantitative RT-PCR in two populations of shrimp, namely P1 that showed susceptibility to AHPND, and P2 that showed tolerance to AHPND. Among these genes, the mRNA expression of chymotrypsin A (ChyA) and serine protease (SP), genes that are involved in metabolism, and crustin-P (CRSTP) and prophenol oxidase activation system 2 (PPAE2), genes involved in bacterial pathogenesis in shrimp, showed differential expression between the two populations. The differential expression of these genes shed light on the mechanism of tolerance against AHPND and these genes can potentially serve as candidate markers for tolerance/susceptibility to AHPND in P. vannamei. This is the first report of a comparison of the mRNA expression profiles of AHPND tolerant and susceptible lines of P. vannamei.


Subject(s)
Gene Expression Profiling , Hepatopancreas/metabolism , Penaeidae/genetics , Transcriptome , Vibrio Infections/veterinary , Vibrio parahaemolyticus/pathogenicity , Animals , Antimicrobial Cationic Peptides/genetics , Chymotrypsin/genetics , Genetic Predisposition to Disease , Hepatopancreas/immunology , Hepatopancreas/microbiology , Hepatopancreas/pathology , Necrosis , Penaeidae/immunology , Penaeidae/microbiology , Serine Endopeptidases/genetics , Serine Proteases/genetics , Vibrio Infections/genetics , Vibrio Infections/immunology , Vibrio Infections/microbiology , Vibrio parahaemolyticus/immunology
8.
Virology ; 553: 117-121, 2021 01 15.
Article in English | MEDLINE | ID: mdl-33271489

ABSTRACT

Davidson's-fixed paraffin-embedded (DFPE) shrimp tissue are a priceless biological resource for pathogen discovery and evolutionary studies for aquaculture disease diagnostic laboratories worldwide. Nucleic acids extracted from DFPE tissues are often not adequate for most downstream molecular analysis due to fragmentation and chemical modifications. In this study, next generation sequencing (NGS) was used to reconstruct the complete genome of three geographical isolates (Belize, Venezuela and Hawaii) of a ~10 kb length RNA virus of shrimp, Taura syndrome virus (TSV), from DFPE tissues that have been archived for 15 years. Phylogenetic analyses showed that TSV isolates from Belize, Venezuela and Hawaii formed well supported clusters with homologous isolates from the corresponding regions submitted in the GenBank database. This is the first study to demonstrate the utility of archived tissue samples for identification of RNA viruses and evolutionary studies involving a viral disease in crustaceans and opens an avenue for expediting pathogen discovery.


Subject(s)
Dicistroviridae/genetics , Genome, Viral , Penaeidae/virology , Animals , Formaldehyde , High-Throughput Nucleotide Sequencing , Paraffin Embedding , Phylogeny , RNA, Viral/genetics , Tissue Fixation , Whole Genome Sequencing
9.
Microorganisms ; 8(10)2020 Oct 08.
Article in English | MEDLINE | ID: mdl-33049933

ABSTRACT

Vibrio parahaemolyticus carrying binary toxin genes, pirAB, is one of the etiological agents causing acute hepatopancreatic necrosis disease (AHPND) in shrimp. This disease has emerged recently as a major threat to shrimp aquaculture worldwide. During a routine PCR screening of AHPND-causing V. parahaemolyticus strains, an isolate tested PCR positive for pirB (R13) and another isolate tested positive for both the pirA and pirB (R14) genes. To evaluate the pathogenicity of these isolates, specific pathogen-free (SPF) Penaeus vannamei were experimentally challenged. For both R13 and R14 isolates, the final survival rate was 100% at termination of the challenge, whereas the final survival with the AHPND-causing V. parahaemolyticus was 0%. The nucleotide sequence of the plasmid DNA carrying the binary toxin genes revealed that R13 contains a deletion of the entire pirA gene whereas R14 contains the entire coding regions of both pirA and pirB genes. However, R14 possesses an insertion upstream of the pirA gene. In R14, mRNA for both pirA and pirB genes could be detected but no cognate proteins. This shows that the genome of AHPND-causing V. parahaemolyticus is highly plastic and, therefore, detection of the pirA and pirB genes alone by DNA-PCR is insufficient as a diagnostic test for AHPND.

10.
Dis Aquat Organ ; 141: 71-78, 2020 Sep 17.
Article in English | MEDLINE | ID: mdl-32940252

ABSTRACT

White feces syndrome (WFS) is an emerging and poorly described disease characterized by the presence of floating white fecal strings in shrimp (Penaeus monodon and P. vannamei) grow-out ponds. WFS has been associated with several pathogens, including Enterocytozoon hepatopenaei. This association is based on the fact that in areas where E. hepatopenaei has been reported, there was also a high WFS prevalence. E. hepatopenaei is an emerging pathogen that has affected cultured shrimp in Indonesia, Vietnam, China, Thailand, and India. In 2016, we reported the presence of E. hepatopenaei in farmed P. vannamei in Venezuela. In this study, we describe the first case of WFS in Venezuela associated with E. hepatopenaei. The white fecal strings and shrimp displaying white feces along the gastrointestinal tract observed in this study were similar to the gross signs found in WFS-impacted P. vannamei in SE Asian countries. Furthermore, we describe a strong association between WFS and E. hepatopenaei in the samples obtained from Venezuela and Indonesia. Quantification of E. hepatopenaei in WFS-affected ponds, ponds with a history of WFS, and ponds with no WFS showed that E. hepatopenaei loads were significantly higher in WFS-affected ponds. Furthermore, these findings constitute the first report of WFS being associated with E. hepatopenaei in farmed shrimp in Latin America. Additionally, we propose that the gross signs of WFS such as floating whitish fecal strings can be used as an indicator of the presence of E. hepatopenaei in countries where E. hepatopenaei is endemic.


Subject(s)
Enterocytozoon , Microsporidiosis/veterinary , Penaeidae , Animals , Feces , Polymerase Chain Reaction/veterinary
11.
Sci Rep ; 10(1): 13425, 2020 08 10.
Article in English | MEDLINE | ID: mdl-32778727

ABSTRACT

Formalin-fixed paraffin-embedded (FFPE) tissues are a priceless resource for diagnostic laboratories worldwide. However, DNA extracted from these tissues is often not optimal for most downstream molecular analysis due to fragmentation and chemical modification. In this study, the complete genome of white spot syndrome virus (WSSV) was reconstructed from ~ 2-year-old archived Davidson's-fixed paraffin-embedded (DFPE) shrimp tissue using Next Generation Sequencing (NGS). A histological analysis was performed on archived DFPE shrimp tissue and a sample showing a high level of WSSV infection was selected for molecular analysis. The viral infection was further confirmed by molecular methods. DNA isolated from DFPE and fresh frozen (FF) tissues were sequenced by NGS. The complete genome reconstruction of WSSV (~ 305 kbp) was achieved from both DFPE and FF tissue. Single nucleotide polymorphisms, insertion and deletions were compared between the genomes. Thirty-eight mutations were identified in the WSSV genomes from the DFPE and FF that differed from the reference genome. This is the first study that has successfully sequenced the complete genome of a virus of over 300 kbp from archival DFPE tissue. These findings demonstrate that DFPE shrimp tissue represents an invaluable resource for prospective and retrospective studies, evolutionary studies and opens avenues for pathogen discovery.


Subject(s)
High-Throughput Nucleotide Sequencing/methods , Penaeidae/genetics , White spot syndrome virus 1/genetics , Animals , Base Sequence/genetics , DNA/genetics , DNA Viruses/genetics , Paraffin Embedding , Penaeidae/virology , Retrospective Studies , White spot syndrome virus 1/pathogenicity
12.
J Invertebr Pathol ; 174: 107424, 2020 07.
Article in English | MEDLINE | ID: mdl-32535000

ABSTRACT

In Latin American shrimp farming, acute hepatopancreatic necrosis disease (AHPND) does not cause the acute mortalities observed in SE Asia. Herein we report for the first time a new phase of infection of AHPND, a chronic phase based on two experimental AHPND-challenge trials using shrimp lines from Latin America. Three shrimp lines of Penaeus vannamei were challenged with a highly pathogenic strain of Vibrio parahaemolyticus causing AHPND (VPAHPND). PCR and histopathology assays were used for confirmation of AHPND in the trials. The first study was to compare survival between the lines. A follow-up trial was conducted to document hepatopancreas heterotrophic bacterial count and to measure the expression of VPAHPND binary toxin genes (pirAB genes) at 24 h.p.i. One of the Latin American shrimp lines, APE1, had significantly higher survival than recorded for the other two lines (APE2 & APE3) and the specific-pathogen-free positive control line. Histopathology showed typical AHPND acute and terminal phase lesions in VPAHPND challenged groups, although destructive cellular changes were more pronounced in the SPF line. Histopathology of animals surviving AHPND revealed a unique chronic phase of infection that resembles septic hepatopancreatic necrosis (SHPN), recognized as diagnostic of digestive tract vibriosis. Data to support our finding, including a quantitative RT-PCR assay, confirmed the expression of pirAB genes and the differential hepatopancreas heterotrophic plate count (HPC) among the different lines challenged. The results explain in part why the shrimp industry in some Latin American countries continues to grow despite the presence of AHPND. In addition, the biology and pathology of AHPND resistant/tolerant shrimp appear to be quite unique in this Latin American shrimp population.


Subject(s)
Hepatopancreas/microbiology , Penaeidae/microbiology , Vibrio parahaemolyticus/physiology , Animals , Hepatopancreas/pathology
13.
J Fish Dis ; 43(4): 403-411, 2020 Apr.
Article in English | MEDLINE | ID: mdl-32048310

ABSTRACT

White spot syndrome virus has been a threat to the global shrimp industry since it was discovered in Taiwan in 1992. Thus, shrimp-producing countries have launched regulations to prevent import of WSSV-infected commodity shrimp from endemic areas. Recently, cooked shrimp that is infected with WSSV tested positive by PCR. However, there is no study to determine the infectivity of WSSV in cooked shrimp that tested positive by PCR. In the present study, WSSV-infected shrimp were cooked at boiling temperature for different times including 0, 1, 3, 5, 10 and 30 min. Upon exposure to boiling temperature, WSSV-infected shrimp were fed to SPF shrimp (Litopenaeus vannamei). The result showed experimentally challenged shrimp from 0-min treatment (positive control) indeed got infected with WSSV. However, experimentally challenged shrimp that were fed tissues boiled at 1, 3, 5, 10 and 30 min were not infected with WSSV. Mortality data showed that only the positive control (0-min) treatment displayed high mortality, whereas no mortality was observed in any other treatment category. These findings suggest that cooking shrimp at boiling temperature for at least 1 min might prevent any potential spread of WSSV from endemic countries to other geographical areas where WSSV has not yet been reported.


Subject(s)
Cooking , DNA Virus Infections/transmission , Food Contamination/prevention & control , Food Microbiology , Foodborne Diseases/prevention & control , White spot syndrome virus 1/physiology , Animals , Foodborne Diseases/virology , Longevity , Penaeidae , Specific Pathogen-Free Organisms , Time Factors
14.
Arch Virol ; 164(12): 3051-3057, 2019 Dec.
Article in English | MEDLINE | ID: mdl-31531743

ABSTRACT

Infectious myonecrosis virus (IMNV) is one of the most pathogenic viruses that affect Penaeus vannamei shrimp. In 2018, IMNV was reported in grow-out ponds of P. vannamei in Situbondo, Indonesia. Diseased animals displayed clinical signs of infectious myonecrosis (IMN) characterized by white discoloration of skeletal muscle. Histopathology of affected shrimp revealed lesions that are pathognomonic of IMNV infection. The major capsid protein (MCP) gene was amplified and sequenced from representative samples showing IMN pathology. Multiple alignment of predicted amino acid sequences of the MCP gene with known IMNV genotypes in the GenBank database revealed three unique genotypes, SB-A, SB-B and SB-C,in Situbondo samples. The number of amino acid changes in SB-A, SB-B and SB-C compared to known IMNV genotypes ranged from 7-710, including the isolate SB-B, which contains deletion of 622 aa. A phylogenetic analysis using homologous sequences from Brazil and Indonesia showed that these three isolates represent new IMNV genotypes.


Subject(s)
Capsid Proteins/genetics , Penaeidae/virology , Sequence Analysis, DNA/veterinary , Totiviridae/classification , Animals , Aquaculture , Brazil , Disease Outbreaks , Indonesia , Necrosis , Phylogeny , Totiviridae/genetics
15.
J Microbiol Methods ; 162: 38-41, 2019 07.
Article in English | MEDLINE | ID: mdl-31103459

ABSTRACT

The detection of enteric pathogens that cause diseases in shrimp involves the sacrifice of the host to obtain tissue samples for diagnosis. In this study, we describe an invasive but non-lethal sampling methodology using a syringe to collect biopsy samples from the hepatopancreas (HP) of Penaeus vannamei to detect the microsporidian pathogen, Enterocytozoon hepatopenaei (EHP), by qPCR and transmission electron microscopy. EHP was detected in all the infected shrimp by qPCR. The shrimp infected by the microsporidian showed 65% survival at 7 days post-sampling. Transmission electron microscopic examination of the biopsy samples revealed numerous spores of the pathogen. The presence of EHP was further confirmed by histology and in situ hybridization from HP tissue samples. The data shows that a hepatopancreas biopsy could be a viable means of detecting enteric pathogens in shrimp, and the method could be valuable in sampling broodstock and natural populations without the need to sacrifice the animals.


Subject(s)
Enterocytozoon/isolation & purification , Penaeidae/microbiology , Shellfish/microbiology , Animals , Aquaculture , Enterocytozoon/genetics , Polymerase Chain Reaction
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