Assuntos
Epidemias , Infecções por Hantavirus/diagnóstico , Infecções por Hantavirus/transmissão , Síndrome Pulmonar por Hantavirus/diagnóstico , Síndrome Pulmonar por Hantavirus/transmissão , Nefropatias/diagnóstico , Zoonoses , Animais , Estudos Transversais , Feminino , Alemanha , Orthohantavírus , Infecções por Hantavirus/epidemiologia , Síndrome Pulmonar por Hantavirus/epidemiologia , Febre Hemorrágica com Síndrome Renal/diagnóstico , Febre Hemorrágica com Síndrome Renal/epidemiologia , Febre Hemorrágica com Síndrome Renal/transmissão , Humanos , Transmissão Vertical de Doenças Infecciosas , Nefropatias/epidemiologia , Masculino , Camundongos , Gravidez , Virus Puumala , Topografia MédicaRESUMO
Members of the Dobrava-Belgrade virus (DOBV) species are hantaviruses carried by different Apodemus mice as reservoir hosts and causing haemorrhagic fever with renal syndrome (HFRS) in humans. In Central Europe, the Kurkino genotype of DOBV, associated with the striped field mouse, Apodemus agrarius, is prevalent. This paper presents the first extensive study of the serological and molecular diagnostics, epidemiology and clinics of DOBV-Kurkino infections in Central Europe. Serum samples from 570 German patients living in the habitat of A. agrarius (north and northeast Germany) and exhibiting febrile disease, were analysed. All samples were tested by ELISA, subsets of samples were also analysed by immunoblot, neutralization assay, and RT-PCR. A group of 86 individuals was confirmed as DOBV-infected. The virus neutralization assay allowed a reliable identification of DOBV antibodies during both acute and convalescent phases of infection. However, differentiation of relevant DOBV genotypes was not possible by neutralization test but required molecular analysis. Whereas DOBV IgM antibodies tend to persist in the infected organism, RNAaemia seems to be short. Nucleotide sequences were amplified from four patients, and their analysis demonstrated infection by DOBV-Kurkino. With respect to the initial results, the high degree of identity of local patient-derived and A. agrarius-derived virus sequences may allow a closer allocation of the geographical place where the human infection occurred. In contrast to moderate/severe HFRS caused by the DOBV genotypes Dobrava or Sochi, all available data showed a mild clinical course of HFRS caused by DOBV-Kurkino infection without lethal outcomes.
Assuntos
Febre Hemorrágica com Síndrome Renal/imunologia , Febre Hemorrágica com Síndrome Renal/virologia , Orthohantavírus/classificação , Orthohantavírus/genética , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Animais , Anticorpos Antivirais/sangue , Criança , Feminino , Genótipo , Alemanha , Orthohantavírus/imunologia , Febre Hemorrágica com Síndrome Renal/epidemiologia , Humanos , Masculino , Camundongos , Pessoa de Meia-Idade , Filogenia , Adulto JovemRESUMO
Cytomegalovirus (CMV)-specific hyperimmunoglobulin (CMV-HIG) is used to treat and prevent CMV infection in immunocompromised patients, and anti-CD20 monoclonal antibody is successfully used in the treatment for post-transplant lymphoproliferative disease caused by Epstein-Barr virus (EBV). Two immunological approaches have been suggested to further improve the control of viral reproduction in patients with active disease: first, the use of monoclonal antibodies with specificity against viral epitopes and second, coadministration of cells with the capacity to promote antibody-dependent cell-mediated cytotoxicity. Here, we have evaluated the effectiveness of these strategies in vitro (alone and in combination) with neutralization and cytotoxicity assays. Our results indicate that monoclonal antibodies (in particular SM5-1) can be as effective as CMV-HIG in neutralizing-cell-free CMV. Moreover, our data indicate that antibody-mediated elimination (either by moAb or by HIG) of EBV-infected cells can be significantly enhanced by NK cells. Using human NK cells that have been purified, cultured and expanded under GMP conditions, we were able to demonstrate that the combination of NK cells and antibodies could represent a feasible and highly effective clinical approach to achieve control of EBV infections. Especially in leukopenic patients with low numbers of ADCC-promoting cells, the combination of adoptively transferred NK cells and antiviral antibodies offers a promising strategy that should be tested in clinical trials.
Assuntos
Infecções por Citomegalovirus/imunologia , Citomegalovirus/imunologia , Infecções por Vírus Epstein-Barr/imunologia , Herpesvirus Humano 4/imunologia , Imunoglobulinas/imunologia , Células Matadoras Naturais/imunologia , Anticorpos Monoclonais/imunologia , Anticorpos Antivirais/imunologia , Antígenos Virais/imunologia , Células Cultivadas , HumanosRESUMO
Hantaviruses are considered to be emerging viruses due to their increasing significance as human pathogens and their cyclic reappearance during outbreaks. Central Europe is an important endemic region for hantavirus infections. Reflecting the presence of all relevant small mammals serving as reservoir hosts, close to all recognized European hantaviruses occur also in Central Europe. Important human pathogens, Puumala and Dobrava-Belgrade viruses, are present and cause hemorrhagic fever with renal syndrome of various severities. Moreover, several of the newly recognized shrew- and mole-borne hantaviruses are present. In this review, we summarize current data on molecular detection of hantaviruses in reservoir hosts as well as on molecular epidemiology of human hantavirus infections in Central Europe.
Assuntos
Infecções por Hantavirus/epidemiologia , Infecções por Hantavirus/veterinária , Orthohantavírus/isolamento & purificação , Animais , Europa (Continente)/epidemiologia , Infecções por Hantavirus/diagnóstico , Infecções por Hantavirus/virologia , HumanosRESUMO
This report shows the performance of MagNA Pure 96 automated nucleic acid extraction for the quantitative detection of cytomegalovirus DNA in clinical samples by real-time PCR. The obtained results demonstrate that this workflow is characterized by high sensitivity and linearity and ensures reliable, reproducible clinical diagnostics.
Assuntos
Infecções por Citomegalovirus/diagnóstico , Citomegalovirus/genética , DNA Viral/análise , DNA Viral/isolamento & purificação , Técnicas de Amplificação de Ácido Nucleico , Automação Laboratorial , Infecções por Citomegalovirus/virologia , Humanos , Reação em Cadeia da Polimerase em Tempo Real , Carga ViralRESUMO
HISTORY AND ADMISSION FINDINGS: With 2017 notified cases the largest hantavirus epidemic in Germany has occurred in 2010. We report on two interesting cases illustrating the wide range of the individual clinical course and the diagnostic problems in hantavirus disease. The first patient was a seriously ill 44-year-old man who needed dialysis after an onset of flu-like symptoms with oliguria. An initially negative result of a hantavirus serology focused attention on rapidly progressive glomerulonephritis. The second patient, a 22-year-old man, presented with severe neurological symptoms with seizures. TREATMENT AND COURSE: Pathological examination of the renal-biopsy specimen in Case 1 reportedly showed the typical pattern of tubulointerstitial damage in the renal cortex and the outer medulla as in hantavirus infection. In a repeated analysis Puumala virus RNA as a marker of acute infection was found. After dialysis and administration of higher-dose systemic glucocorticoids the patient slowly recovered. In Case 2 the severe neurological symptoms caused a complete neurological diagnostic with lumbar puncture and MRI before the detection of specific antibodies and Puumala virus RNA showed that nephropathia epidemica was the disease. The patient recovered after 10 days. CONCLUSION: Because of the variability of symptoms and the extrarenal manifestations of the disease the nephropathia epidemica can occasionally cause problems of differential diagnosis. A rapid diagnosis is important because of the urgent differentiation of other renal diseases with bad prognosis.
Assuntos
Infecções por Hantavirus/diagnóstico , Infecções por Hantavirus/patologia , Adulto , Animais , Anticorpos Antivirais/sangue , Diagnóstico Diferencial , Epidemias , Alemanha/epidemiologia , Infecções por Hantavirus/epidemiologia , Infecções por Hantavirus/transmissão , Humanos , Rim/patologia , Masculino , Camundongos , Adulto JovemRESUMO
Primary infection and reactivation of human cytomegalovirus (CMV) remain a major problem in immunocompromised patients, frequently resulting in a life threatening CMV disease. Intravenous polyvalent (hyper)-immunoglobulins (IVIG) can be administered for therapy and prophylaxis of CMV infections. However, only limited data about the efficacy and mechanism of action of IVIG products against viral infections in vitro are available so far. In this study, the effect of IVIG on CMV infection in vitro was investigated using isolates from CMV-infected patients as well as the laboratory strains AD169 and TB40. A qualitative and quantitative comparison of five different commercially available IVIG products in different human cell lines was performed concerning their ability (1) to neutralize cell-free virus, (2) to inhibit cell-to-cell spread and cell-associated transmission and (3) to influence CMV mRNA levels. All IVIG tested exhibited a high neutralization activity in epithelial and endothelial cell cultures (50% inhibition dose <0.1 mg/ml). However, qualitative differences between the products could be demonstrated in neutralization tests using human embryonal lung fibroblasts (HELF). The IVIG products also significantly differed in their ability to inhibit cell-to-cell spread within an CMV-infected HELF monolayer displaying inhibition rates that varied between 61 and 100%. No correlation between the ability to neutralize cell-free virus and to inhibit cell-to-cell spread could be observed. The incubation with IVIG influenced the amount of CMV immediate early and late mRNA, as indicated by a significant reduction in CMV mRNA in infected epithelial cells after incubation with IVIG in a dose-dependent manner. This study suggests different antiviral functions of polyvalent IVIG and confirms their potential to inhibit a CMV infection in vitro, with profound differences between the hereby used IVIG products.
Assuntos
Antivirais/farmacologia , Citomegalovirus/efeitos dos fármacos , Células Endoteliais/virologia , Células Epiteliais/virologia , Imunoglobulinas Intravenosas/farmacologia , Antivirais/imunologia , Linhagem Celular , Citomegalovirus/genética , Citomegalovirus/isolamento & purificação , Citomegalovirus/fisiologia , Infecções por Citomegalovirus/virologia , Fibroblastos/virologia , Humanos , Hospedeiro Imunocomprometido , Imunoglobulinas Intravenosas/imunologia , Leucócitos/virologia , Testes de Neutralização , RNA Mensageiro/genética , RNA Mensageiro/metabolismoRESUMO
Acute hepatitis E virus (HEV) infection is a self-limiting symptomatic or asymptomatic disease. However, as recently observed, it can manifest itself as chronic hepatitis in patients receiving solid organ transplants as well as in patients with HIV infection or severe hematologic disorders. Here, we describe the clinical course of a 73-year-old male patient in whom HEV transmission occurred after receiving a HEV-infected liver from a donor with occult HEV infection, whereby the patient had tested negative for HEV RNA and anti-HEV antibodies shortly before explantation. Anti-HEV IgG, IgM, and HEV RNA were detected in the first tested serum sample of the liver recipient obtained 150 days after liver transplantation and remained positive (earlier samples after OLT were not available). Liver cirrhosis developed within 15 months and the patient died of septic shock. Based on phylogenetic analyses of the donor and recipient's HEV strains, we were able to prove that the occult HEV infection was transmitted via the graft.
Assuntos
Hepatite E/transmissão , Transplante de Fígado/efeitos adversos , Idoso , Doença Crônica , Hepatite E/diagnóstico , Hepatite E/virologia , Vírus da Hepatite E/genética , Vírus da Hepatite E/isolamento & purificação , Humanos , Cirrose Hepática/etiologia , Cirrose Hepática/patologia , Cirrose Hepática/virologia , Masculino , Filogenia , RNA Viral/genética , RNA Viral/isolamento & purificação , Doadores de TecidosRESUMO
Different species of non-human primates have been exploited as animal disease models for human hantavirus infections. To study the potential risk of natural hantavirus infection of non-human primates, we investigated serum samples from non-human primates of three species living in outdoor enclosures of the German Primate Center (GPC), Göttingen, located in a hantavirus endemic region of central Germany. For that purpose we used serological assays based on recombinant antigens of the bank vole (Myodes glareolus) transmitted Puumala virus (PUUV) and the common and field vole (Microtus arvalis, Microtus agrestis) associated Tula virus (TULV) which are both broadly geographically distributed in Germany. In 24 out of 251 (9.6%) monkey sera collected in 2006 PUUV- and/or TULV-reactive immunoglobulin G (IgG) antibodies were detected. Investigation of follow-up sera from 13 animals confirmed for two animals a seroconversion due to hantavirus exposure at the GPC. To prove the origin of the infection, wild rodents from the surrounding regions were analyzed by hantavirus-specific reverse transcriptase-PCR analysis. In 6 of the 73 investigated bank voles and 3 of the 19 investigated Microtus spp. PUUV- and TULV-specific nucleic acid sequences, respectively, were detected. In conclusion, our investigations demonstrate for the first time natural infections of non-human primates in outdoor enclosures in Germany. These findings highlight the importance of hantavirus surveillance in those primate housings and corresponding preventive measures against wild rodents, particularly in hantavirus endemic regions.
Assuntos
Animais de Zoológico , Arvicolinae/virologia , Cercopithecinae , Infecções por Hantavirus/veterinária , Doenças dos Macacos/epidemiologia , Doenças dos Macacos/virologia , Doenças dos Roedores/virologia , Animais , Anticorpos Antivirais/sangue , Feminino , Alemanha , Orthohantavírus , Infecções por Hantavirus/diagnóstico , Infecções por Hantavirus/epidemiologia , Infecções por Hantavirus/transmissão , Imunoglobulina G/sangue , Masculino , Dados de Sequência Molecular , Doenças dos Macacos/diagnóstico , Doenças dos Macacos/transmissão , Fatores de Risco , Doenças dos Roedores/epidemiologiaRESUMO
From January to April 2010, 396 hantavirus infections were notified in Germany, a considerable increase compared with previous years (mean: 83 for January-April 2004-2009) including the record-setting year, 2007 (n=232 January-April). Most patients are residents of known Puumala virus endemic areas in southern Germany. The recent increase in notified hantavirus infections is probably due to an increased population density of the main animal reservoir, the bank vole (Myodes glareolus).
Assuntos
Notificação de Doenças , Infecções por Hantavirus/epidemiologia , Orthohantavírus/isolamento & purificação , Adolescente , Adulto , Idoso , Animais , Criança , Pré-Escolar , Vetores de Doenças , Alemanha/epidemiologia , Infecções por Hantavirus/etiologia , Humanos , Pessoa de Meia-Idade , Adulto JovemRESUMO
In tissue and organ transplantation, it is of great importance to avoid the transmission of blood-borne viruses to the recipient. While serologic testing for anti-human immunodeficiency virus (HIV)-1 and -2, anti-hepatitis C virus (HCV), hepatitis B surface antigen (HBsAg), anti-hepatitis B core antigen (HBc), and Treponema pallidum infection is mandatory, there is until now in most countries no explicit demand for nucleic acid amplification testing (NAT) to detect HIV, hepatitis B virus (HBV), and HCV infection. After a review of reports in the literature on viral transmission events, tissue-specific issues, and manufacturing and inactivation procedures, we evaluated the significance of HIV, HCV, and HBV detection using NAT in donors of various types of tissues and compared our results with the experiences of blood banking organizations. There is a significant risk of HIV, HCV, and HBV transmission by musculoskeletal tissues because of their high blood content and the high donor-recipient ratio. If no effective virus inactivation procedure for musculoskeletal tissue is applied, donors should be screened using NAT for HIV, HCV, and HBV. Serologically screened cardiovascular tissue carries a very low risk of HIV, HCV, or HBV transmission. Nevertheless, because effective virus inactivation is impossible (retention of tissue morphology) and the donor-recipient ratio may be as high as 1:10, we concluded that NAT should be performed for HIV, HCV, and HBV as an additional safety measure. Although cornea allografts carry the lowest risk of transmitting HIV, HCV, and HBV owing to corneal physiology, morphology, and the epidemiology of corneal diseases, NAT for HCV should still be performed. If the NAT screening of a donor for HIV, HCV, and HBV is negative, quarantine storage of the donor tissue seems dispensable. In view of numerous synergistic effects with transfusion medicine, it would be advantageous for tissue banks to cooperate with blood bank laboratories in performing virological tests.
Assuntos
Técnicas de Amplificação de Ácido Nucleico , Transplante de Tecidos/efeitos adversos , Obtenção de Tecidos e Órgãos , Viroses/transmissão , Vírus/isolamento & purificação , Bancos de Sangue , Cadáver , Análise Custo-Benefício , Humanos , Doadores Vivos , Viroses/prevenção & controleRESUMO
A 43 year healthy old man complains of fever with abdominal pain, vomiting, diarrhoea, followed by the development of thrombocytopenia and acute renal failure. The laboratory tests show the presence of Hantavirus specific IgM and IgG which is confirmed by a specific test revealing Puumala serotype as responsible. The patient received a symptomatic treatment with a favourable evolution allowing discharge about ten days after the beginning of symptoms. Hantavirus are transmitted by rodents, and this patient has certainly been infected in Switzerland in the absence of travel abroad during the incubation period. This means that when confronted in Switzerland with an acute nephritis of unknown origin, a diagnosis of nephropathia epidemica must be taken into account.
Assuntos
Febre Hemorrágica com Síndrome Renal/diagnóstico , Adulto , Humanos , Masculino , SuíçaRESUMO
BACKGROUND: In Europe certain hantaviruses are known to cause hemorrhagic fever with renal syndrome of different severity. The objective of the present investigation was to study the presence of hantavirus infections in Lithuania. MATERIAL AND METHODS: Two different serum panels from cancer patients (n = 438) and blood donors (n = 299) from Lithuania were tested by monoclonal antibody capture IgG ELISA using yeast-expressed recombinant nucleocapsid (rN) proteins of Puumala virus (PUUV), Hantaan virus (HTNV) and Dobrava virus (DOBV). The reactivity of ELISA-positive sera was proven in Western blot tests using various hantavirus rN proteins. Selected serum samples were further analyzed by focus reduction neutralization assays. RESULTS: In the IgG ELISA 39 sera from the cancer patients and four sera from blood donors were found to be reactive with at least one of the rN proteins. By immunoblot using the three yeast-expressed rN proteins, the ELISA reactivity of 36 of 39 and two of four serum samples from cancer patients and blood donors, respectively, was confirmed; this corresponds to a seroprevalence of 8.2% and 0.7%, respectively. In ELISA, the majority of the samples reacted exclusively with rN proteins of HTNV and DOBV (31 of 36 and one of two in the two groups). In the group of sera selected for serotyping by focus reduction neutralization assay, this dominance was confirmed by the identification of eight DOBV but only four PUUV infections. No infection by HTNV or another hantavirus besides DOBV and PUUV was verified. Anti-hantavirus-positive human sera were detected in all seven investigated counties of Lithuania. CONCLUSION: In Lithuania at least two hantaviruses, DOBV and PUUV, circulate and cause human infections. Additional investigations are needed to study the seroprevalence more precisely and to search for clinical cases of hantavirus infections.
Assuntos
Infecções por Hantavirus/epidemiologia , Anticorpos Antivirais/sangue , Ensaio de Imunoadsorção Enzimática , Humanos , Immunoblotting , Imunoglobulina G/sangue , Lituânia/epidemiologiaRESUMO
In Europe, hantavirus infections usually present as hemorrhagic fever with renal syndrome and its mild form nephropathia epidemica, while clinical cases with severe pulmonary affections are extremely rare and appear to be confined to infections by New World hanta viruses in the Americas. We report on a female patient from Northern Germany, who suffered primarily from severe acute respiratory distress syndrome-like pulmonary failure due to Dobrava hantavirus infection that was complicated by acute renal insufficiency.
Assuntos
Infecções por Hantavirus/virologia , Síndrome Pulmonar por Hantavirus/virologia , Febre Hemorrágica com Síndrome Renal/virologia , Orthohantavírus/classificação , Feminino , Alemanha/epidemiologia , Infecções por Hantavirus/diagnóstico , Síndrome Pulmonar por Hantavirus/diagnóstico , Febre Hemorrágica com Síndrome Renal/diagnóstico , Humanos , Pessoa de Meia-IdadeRESUMO
Hantaviruses belong to the group of "emerging" viruses. Pathogenic European hantaviruses can cause a human disease designated "hemorrhagic fever with renal syndrome" of varying severity. In general, diagnostics of hantavirus infections are based on immunofluorescence assays using virus-infected cells or enzyme immunoassays and Western blot tests using recombinant nucleocapsid proteins. For highly sensitive detection of hantavirus-specific antibodies in the enzyme immunoassay, a homologous hantavirus nucleocapsid protein is needed as a diagnostic antigen. Serological typing of hantavirus infections can be obtained by neutralization assays, which in certain cases require the use of late convalescent sera. The seroprevalence in the normal German population is about 1%. In professionally exposed risk groups, e. g., forest workers, a seroprevalence higher than that in the normal population was observed. Endemic regions for hantavirus infections are located mainly in Baden-Württemberg. In the years 2001-2003 an annual number of about 200 clinically apparent hantavirus infections were registered in Germany. Neutralization assays detected almost exclusively human infections caused by Puumala and Dobrava viruses, only very rarely by Tula virus. Until this day in Germany mainly mild to moderate courses of human hantavirus infections have been documented. Besides infections caused by "German" hantaviruses, up to 10% of the clinically apparent hantavirus infections registered annually in Germany are caused by infections imported from other countries, mainly from Europe. So far only very limited molecular genetic data about the circulating hantaviruses in Germany are available. Additional investigations are needed to get a more precise picture about the distribution of hantaviruses in Germany and to calculate the resulting risk for the human population.
Assuntos
Controle de Doenças Transmissíveis/métodos , Doenças Transmissíveis Emergentes/diagnóstico , Doenças Transmissíveis Emergentes/epidemiologia , Surtos de Doenças/estatística & dados numéricos , Infecções por Hantavirus/diagnóstico , Infecções por Hantavirus/epidemiologia , Medição de Risco/métodos , Doenças Transmissíveis Emergentes/sangue , Doenças Transmissíveis Emergentes/imunologia , Alemanha/epidemiologia , Infecções por Hantavirus/sangue , Infecções por Hantavirus/imunologia , Humanos , Prevalência , Fatores de Risco , Estudos Soroepidemiológicos , Testes SorológicosRESUMO
In Europe, Dobrava virus (DOBV) carried by the yellow-necked field mouse Apodemus flavicollis is one of the hantaviruses that can cause severe hemorrhagic fever with renal syndrome in humans. For several hantaviruses, the nucleocapsid (N) protein has proven to be very immunogenic in humans and rodents and even can protect rodents against a virus challenge. To investigate the immunogenicity of DOBV N protein, BALB/c and C57BL/6 mice were immunized three times with a DOBV recombinant N (rN) protein expressed in yeast Saccharomyces cerevisiae together with complete Freund's, with incomplete Freund's, and without adjuvant, respectively. Mice of both strains elicited N-specific antibodies with end-point titers being as high as 1:1,000,000 in C57BL/6 mice. The antibodies induced by DOBV rN protein were highly cross-reactive to the rN proteins of hantaviruses Puumala and Hantaan. In both mice strains, DOBV rN protein induced N-specific antibodies of all IgG subclasses (IgG1, IgG2a, IgG2b, and IgG3), suggesting a mixed Th1/Th2 immune response. Taken together, yeast-expressed DOBV rN protein represents a promising vaccine candidate.
Assuntos
Anticorpos Antivirais/sangue , Proteínas do Nucleocapsídeo/imunologia , Orthohantavírus/imunologia , Proteínas Recombinantes/imunologia , Saccharomyces cerevisiae/genética , Vacinas Virais/imunologia , Animais , Anticorpos Antivirais/imunologia , Reações Cruzadas , Feminino , Adjuvante de Freund/administração & dosagem , Orthohantavírus/genética , Infecções por Hantavirus/prevenção & controle , Infecções por Hantavirus/virologia , Imunização , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos C57BL , Proteínas do Nucleocapsídeo/genética , Proteínas do Nucleocapsídeo/metabolismo , Proteínas Recombinantes/administração & dosagem , Proteínas Recombinantes/metabolismo , Vacinas Virais/administração & dosagemRESUMO
Hantavirus nucleocapsid protein (N) has been proven to induce highly protective immune responses in animal models. The knowledge on the mechanisms behind N-induced protection is still limited, although recent data suggest that both cellular and humoral immune responses are of importance. For a detailed B-cell epitope mapping of Puumala hantavirus (PUUV) N, we used recombinant N derivatives of the Russian strain CG18-20 and the Swedish strain Vranica/Hällnäs, as well as overlapping synthetic peptides corresponding to the Finnish prototype strain Sotkamo. The majority of a panel of monoclonal antibodies (mAbs) reacted with proteins derived from all included PUUV strains demonstrating the antigenic similarity of these proteins. In line with previous results, the epitopes of most mAbs were mapped within the 80 N-terminal amino acids of N. The present study further revealed that the epitopes of four mAbs raised against native viral N were located within amino acids 14-45, whereas one mAb raised against recombinant N was mapped to amino acids 14-39. Differences between the reactivity of the PUUV strains Vranica/Hällnäs and CG18-20 N suggested the importance of amino acid position 35 for the integrity of the epitopes. In line with the patterns obtained by the truncated recombinant proteins, mapping by overlapping peptides (PEPSCAN) confirmed a complex recognition pattern for most analyzed mAbs. Together, the results revealed the existence of several, partially overlapping, and discontinuous B-cell epitopes. In addition, based on differences within the same competition group, novel epitopes were defined.
Assuntos
Mapeamento de Epitopos/métodos , Epitopos de Linfócito B , Nucleocapsídeo/imunologia , Virus Puumala/imunologia , Sequência de Aminoácidos , Animais , Anticorpos Monoclonais/imunologia , Camundongos , Dados de Sequência Molecular , Nucleocapsídeo/químicaRESUMO
Hantaviruses are rodent-borne bunyaviruses which cause haemorrhagic fever with renal syndrome and Hantavirus pulmonary syndrome in humans. This review covers the host interactions of the viruses, including the rodent reservoirs, the clinical outcome of human infections as well as the pathogenesis and laboratory diagnosis of infections. The current stage in prophylaxis and therapy of hantaviral diseases is described and different approaches in vaccine development are discussed.
Assuntos
Infecções por Hantavirus/prevenção & controle , Orthohantavírus/fisiologia , Animais , Antivirais/uso terapêutico , Ensaios Clínicos como Assunto , Reservatórios de Doenças , Infecções por Hantavirus/diagnóstico , Infecções por Hantavirus/imunologia , Infecções por Hantavirus/terapia , Interações Hospedeiro-Parasita , Humanos , Vacinas Virais/imunologiaRESUMO
We report on the first Puumala hantavirus nucleotide sequence (strain Opina-916) amplified from a bank vole trapped in Slovakia, central Europe. Phylogenetic analysis of the S-segment sequence grouped the virus within the western/central European sublineage of Puumala virus. In the neighborhood of the rodent trapping site two cases of human infection by the Puumala virus were verified.