Consulta: subjectFacets:"Hepatitis A virus"
Registros recuperados: 12
Data/hora: 16/06/2024 09:01:32

Development of genomic probes for detection of hepatitis A virus and enteroviruses in shellfish
Provedor de dados: 5
Autores: Apaire, M; Leguyader, F; Besse, B; Billaudel, S.
The development of molecular biology techniques has modified research procedures for certain viruses, particularly hepatitis A virus (HAV) and enteroviruses. Accordingly, we designed cDNA and RNA genomic probes to detect viruses in shellfish in the environment. Better sensitivity was noted with RNA than cDNA probes: only 17/83 shellfish samples were positive with HAV and enterovirus DNA probes, where as 42/83 were positive with HAV and enterovirus RNA probes.
Tipo: Text
Palavras-chave: Mollusca; Enterovirus; Hepatitis A virus; Picornaviridae; RNA probes; DNA probes; Seafood; Biology; Sensors; DNA; RNA; Viruses; Detection; Marine molluscs; Shellfish.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1613.pdf

Contamination of Clams with Human Norovirus and a Novel Hepatitis A Virus in Cameroon
Provedor de dados: 5
Autores: Bonny, Patrice; Desdouits, Marion; Schaeffer, Julien; Garry, Pascal; Essia Ngang, Jean Justin; Le Guyader, Soizick.
Shellfish constitute an important protein source but may be contaminated by viruses from various origins. A study performed on clams collected in Cameroon showed a high prevalence of norovirus and hepatitis A virus. After sequencing, the hepatitis A virus showed similarities with the genotype V simian strains. The need for a one-health approach to protect humans from emerging diseases is evident by the high number of microbial pathogens that become zoonotic following insect bites or consumption of contaminated meat. This is particularly well documented for infectious disease transmission from non-human primates to human (Devaux et al. 2019). Environmental issues are critical in such events, especially for RNA viruses that may be excreted at high...
Tipo: Text
Palavras-chave: Shellfish; Hepatitis A virus; Molecular epidemiology.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00635/74745/74851.pdf

Viral contamination and depuration of oysters under field conditions
Provedor de dados: 5
Autores: Boher, S; Piclet, Guy; Beril-stien, S; Masson, Daniel; Delonce, R; Biziagos, E; Schwartzbrod, L.
Shellfish consumption is clearly associated with the transmission of enteric viruses. The channel of transmission of enteric viruses to human beings could be decreased particularly if the systems of depuration of shellfish were optimized, standardized and if their viral efficiency was controlled. The purpose of this work was to study the contamination of oysters and to assess the efficiency of several depuration processes. Our study have demonstrated that in some cases, 50% of oysters samples contain enteric viruses or H.A.V. antigen and the quantities of viruses range from 17 to 246 FF for the rotaviruses and from 124 to 200 for the enteroviruses per 100 g of tissue. According to our results, the exclusive use of a bacteriological criterium to determine...
Tipo: Text
Palavras-chave: Rotavirus; Hepatitis A virus; Enterovirus; Crassostrea gigas; Bivalvia; Seafood; Bioassays; Cell culture; Viruses; Self purification; Viral diseases; Shellfish.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1615.pdf

Norovirus and Other Human Enteric Viruses in Moroccan Shellfish
Provedor de dados: 5
Autores: Benabbes, Laila; Ollivier, Joanna; Schaeffer, Julien; Parnaudeau, Sylvain; Rhaissi, Houria; Nourlil, Jalal; Le Guyader, Soizick.
The aim of this study was to evaluate the presence of human enteric viruses in shellfish collected along the Mediterranean Sea and Atlantic Coast of Morocco. A total of 77 samples were collected from areas potentially contaminated by human sewage. Noroviruses were detected in 30 % of samples, with an equal representation of GI and GII strains, but were much more frequently found in cockles or clams than in oysters. The method used, including extraction efficiency controls, allowed the quantification of virus concentration. As in previous reports, results showed levels of contamination between 100 and 1,000 copies/g of digestive tissues. Sapoviruses were detected in 13 % of samples mainly in oyster and clam samples. Hepatitis A virus was detected in two...
Tipo: Text
Palavras-chave: Shellfish; Norovirus; Hepatitis A virus; Environmental conditions; Quantification; Morocco.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00130/24102/22489.pdf

Assessment of human enteric viruses in cultured and wild bivalve molluscs
Provedor de dados: 5
Autores: Luz Vilarino, M.; Le Guyader, Soizick; Polo, David; Schaeffer, Julien; Krol, Joanna; Romalde, Jesus L.
Standard and real-time reverse transcription-PCR (rRT-PCR) procedures were used to monitor cultured and wild bivalve molluscs from the Ria de Vigo (NW Spain) for the main human enteric RNA viruses, specifically, norovirus (NoV), hepatitis A virus (HAV), astrovirus (AsV), rotavirus (RT), enterovirus (EV), and Aichi virus (AiV). The results showed the presence of at least one enteric virus in 63.4% of the 41 samples analyzed. NoV GII was the most prevalent virus, detected in 53.7% of the samples, while NoV GI, AsV, EV, and RV were found at lower percentages (7.3, 12.2, 12.2, and 4.9%, respectively). In general, samples obtained in the wild were more frequently contaminated than those from Cultured (70.6 vs. 58.3%) molluscs and were more readily contaminated...
Tipo: Text
Palavras-chave: Seafood industry; Viral quantification; Viral prevalence; Norovirus; Hepatitis A virus; Enteric viruses; Molluscs.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6957.pdf

Validation of EN ISO method 15216-Part 1-Quantification of hepatitis A virus and norovirus in food matrices
Provedor de dados: 5
Autores: Lowther, J. A.; Bosch, A.; Butot, S.; Ollivier, Joanna; Maede, D.; Rutjes, S. A.; Hardouin, G.; Lombard, B.; In'T Veld, P.; Leclercq, A.
Hepatitis A virus (HAV) and norovirus are important agents of food-borne human viral illness, with common vehicles including bivalve molluscan shellfish, soft fruit and various vegetables. Outbreaks of viral illness due to contamination of the surfaces of foods, or food preparation surfaces by for example infected food handlers are also common. Virus analysis of food matrices can contribute towards risk management for these hazards and a two-part technical specification for determination of Hepatitis A virus and norovirus in food matrices (ISO/TS 15216:2013) was published jointly by the European Committee for Standardisation and the International Organization for Standardization in 2013. As part of the European Mandate No. M381 to validate 15 standards in...
Tipo: Text
Palavras-chave: Norovirus; Hepatitis A virus; Real-time RT-PCR; Validation; Standardization; Bivalve molluscan shellfish; Soft fruit; Vegetables; Bottled water; Surfaces.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00476/58776/61442.pdf

Processing Strategies to Inactivate Enteric Viruses in Shellfish
Provedor de dados: 5
Autores: Richards, Gary P.; Mcleod, Catherine; Le Guyader, Soizick.
Noroviruses, hepatitis A and E viruses, sapovirus, astrovirus, rotavirus, Aichi virus, enteric adenoviruses, poliovirus, and other enteroviruses enter shellfish through contaminated seawater or by contamination during handling and processing, resulting in outbreaks ranging from isolated to epidemic. Processing and disinfection methods include shellfish depuration and relaying, cooking and heat pasteurization, freezing, irradiation, and high pressure processing. All the methods can improve shellfish safety; however, from a commercial standpoint, none of the methods can guarantee total virus inactivation without impacting the organoleptic qualities of the shellfish. Noroviruses cause the majority of foodborne viral illnesses, yet there is conflicting...
Tipo: Text
Palavras-chave: Shellfish; Processing; Norovirus; Hepatitis A virus; Depuration; High pressure; Heat inactivation.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12253/9199.pdf

Virus entériques humains et coquillages
Provedor de dados: 5
Autores: Parnaudeau, Sylvain; Le Mennec, Cecile; Miura, Takayuki; Le Saux, Jean-claude; Le Guyader, Soizick.
Human enteric viruses discharged in raw sewage are hightly resistant and may be detected in surface waters, coastal areas and shellfish. Whereas noroviruses, responsible for relatively benign acute gastroentritis, are the most common agents implicated in shellfish borne outbreaks, other human viruses which cause severe human diseases, such as hepatitis A virus, may also be transmitted. Environmental studies have demonstrated that virus concentrations detected in shellfish are higher than in surrounding waters. This concentration may explain the high prevalence of noroviruses detected in various shellfish species collected in different countries. If many questions remain regarding viral contamination of shellfish, the most important seems to be the...
Tipo: Text
Palavras-chave: Shellfish; Human enteric viruses; Norovirus; Hepatitis A virus; Coquillage; Virus entérique humain; Norovirus; Virus de l'hépatite A.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00317/42849/42258.pdf

Seroprevalence of hepatitis A immunity among brazilian adult patients with liver cirrhosis: is HAV vaccination necessary?
Provedor de dados: 55
Autores: Oliveira,Luiz Carlos Marques de; Comácio,Samantha Martins; Santos,Júlia de Fátima Gonçalves.
BACKGROUND: Patients with chronic liver disease have a higher risk of fulminant hepatitis when infected with hepatitis A virus, and vaccination of these patients against such infection is recommended. In Brazil, mainly in the South and Southeast regions, the epidemiology of hepatitis A (HA) has shifted from high to intermediate endemicity, which would have implication on policy of HA vaccination for these populations. OBJECTIVE: To verify the prevalence of HA immunity in adult patients with liver cirrhosis (LC), in Uberlândia MG, a city of Southeastern Brazil. METHODS: Between December 2005 and December 2006, 106 patients with LC were consecutively evaluated. In addition, 75 individuals without LC or alcoholism were evaluated (control group - CG). RESULTS:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hepatitis A vaccines; Hepatitis A virus; Liver cirrhosis; Prevalence.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702011000300015

In situ enzyme immunoassay for titration of a Brazilian hepatitis A virus strain (HAF-203)
Provedor de dados: 56
Autores: Villar,L.M.; Amado,L.A.; Gaspar,A.M.C.
Hepatitis A virus (HAV) replicates relatively slowly in cell culture without a cytopathic effect, a fact that limits the use of tissue culture assays. The radioimmunofocus assay is the standard method for HAV titration, although it is labor intensive and requires the use of radioisotopes. A simple, rapid and objective infectivity assay based on an in situ enzyme immunoassay (EIA) is described here for a Brazilian cell culture-adapted HAV strain (HAF-203). The assay uses a peroxidase-labeled polyclonal antibody to fixed monolayers as an indicator of infection. EIA may be completed within 7 days using serial 5-fold dilutions of the virus, yielding a titer of 5.024 log 50% tissue culture infective dose (TCID50)/ml for HAF-203. This technique had a detection...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Hepatitis A virus; Virus titration; Enzyme immunoassay.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000700011

Co-circulation of genotypes IA and IB of hepatitis A virus in Northeast Brazil
Provedor de dados: 56
Autores: Villar,L.M.; Morais,L.M.; Aloise,R.; Melo,M.M.M.; Calado,I.A.; Lampe,E.; Gaspar,A.M.C.
The Northeast region is the location of most cases of acute hepatitis A virus (HAV) in Brazil. In the present study, the genotypes of HAV strains from Pernambuco State, one of most populous states in the Northeast region, were characterized. Blood samples positive for anti-HAV IgM from 145 individuals (mean age = 29.1 years), collected during 2002 and 2003, were submitted to nested RT-PCR for amplification of the 5'non-translated region (5'NTR) and VP1/2A regions of the HAV genome. The VP1/2A and 5'NTR regions were amplified in 39 and 21% of the samples, respectively. Nucleotide sequencing was carried out in 46% of VP1/2A and in 53% of 5'NTR isolates. The identity in nucleotide sequence of the VP1/2A region ranged from 93.6 to 100.0%. Phylogenetic analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hepatitis A virus; Molecular epidemiology; Sub-genotype IA; Sub-genotype IB.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000700004

Longitudinal study on occurrence of adenoviruses and hepatitis A virus in raw domestic sewage in the city of Limeira, São Paulo
Provedor de dados: 58
Autores: Barrella,Karina Medici; Garrafa,Patrícia; Monezi,Telma Alves; Hársi,Charlotte Marianna; Salvi,Cleber; Violante,Paula Alessandra B. Costa; Mehnert,Dolores Ursula.
The aim of this study was to verify the presence and annual distribution of adenoviruses and hepatitis A virus in domestic sewage in the city of Limeira, São Paulo. Fifty samples with a volume of 8 liters each were collected weekly from December 2004 to December 2005. The viruses were concentrated by filtration through positively charged ZP60S filter membranes, followed by ultracentrifugation. Human adenoviruses (HAdV) were detected by PCR followed by nested-PCR and screening for species F was done by restriction of the PCR product with TaqI endonuclease. Virus infectivity assays were performed by inoculation of concentrates onto HEp-2 cell monolayers. RT-PCR was used for the detection of hepatitis A virus. HAdV were detected in all samples, and 64% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adenoviruses; Human adenovirus F; Hepatitis A virus; Sewage treatment.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000100017