oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2019 ( 24 )

2018 ( 117 )

2017 ( 138 )

Custom range...

Search Results: 1 - 10 of 8173 matches for " St. Louis Encephalitis virus "
All listed articles are free for downloading (OA Articles)
Page 1 /8173
Display every page Item
Two cases of Saint Louis encephalitis in HIV-1 infected patients in Buenos Aires
Viloria, Guillermo Alberto;Kundro, Mariana Angelica;Toibaro, Javier Jose;Seijo, Alfredo;Losso, Marcelo Horacio;
Brazilian Journal of Infectious Diseases , 2011, DOI: 10.1590/S1413-86702011000600019
Abstract: saint louis encephalitis virus (sle) is a mosquito borne disease. only a small proportion of cases progress to severe clinical forms. there have been few reports on hiv-infected patients and the relationship between immunodeficiency and the course of the disease remains unclear. herein we describe two cases of sle in hiv-1-infected patients in buenos aires city.
Brote de encefalitis de San Luis en el área Metropolitana Buenos Aires
Seijo,Alfredo; Morales,Alejandra; Poustis,Gladys; Romer,Yamila; Efron,Ernesto; Vilora,Guillermo; Lloveras,Susana; Giamperetti,Sergio; Puente,Teresita; Monroig,Jessica; Luppo,Victoria; Enria,Delia;
Medicina (Buenos Aires) , 2011,
Abstract: we describe the epidemiological and clinical findings of 13 patients with diagnosis of infection by st. louis encephalitis virus, transmitted between january and march 2010 in buenos aires metropolitan area (amba). thirteen patients, average age 38 years, had an acute onset with hyperthermia and headache. between days two and ten of the onset of symptoms, 7/13 patients had signs and symptoms of neurological involvement. this was characterized by meningitis without encephalic sings in 1/7 and in 6/7 the most frequent findings were: stiff neck, disorientation, photophobia, confusion and language impairment. two mr and one eeg revealed signs of involvement of temporal lobes. the cerebrospinal fluid showed pleocytosis with predominance of mononuclear cells, normal glucose and moderately elevated protein. there were no fatalities cases. in 6/13 patients the initial clinical suspicion was dengue. as epidemic virus circulation had not been previously reported in the amba it can be considered an outbreak of st. luis encephalitis for the spatial and temporal clustering of cases.
Seroconversion for west Nile and St. Louis encephalitis viruses among sentinel horses in Colombia
Mattar, Salim;Komar, Nicholas;Young, Ginger;Alvarez, Jaime;Gonzalez, Marco;
Memórias do Instituto Oswaldo Cruz , 2011, DOI: 10.1590/S0074-02762011000800012
Abstract: we prospectively sampled flavivirus-na?ve horses in northern colombia to detect west nile virus (wnv) and st. louis encephalitis virus (slev) seroconversion events, which would indicate the current circulation of these viruses. overall, 331 (34.1%) of the 971 horses screened were positive for past infection with flaviviruses upon initial sampling in july 2006. during the 12-month study from july 2006-june 2007, 33 wnv seroconversions and 14 slev seroconversions were detected, most of which occurred in the department of bolivar. the seroconversion rates of horses in bolivar for the period of march-june 2007 reached 12.4% for wnv and 6.7% for slev. these results comprise the first serologic evidence of slev circulation in colombia. none of the horses sampled developed symptoms of encephalitis within three years of initial sampling. using seroconversions in sentinel horses, we demonstrated an active circulation of wnv and slev in northern colombia, particularly in the department of bolivar. the absence of wnv-attributed equine or human disease in colombia and elsewhere in the caribbean basin remains a topic of debate and speculation.
Genetic characterization of St. Louis encephalitis virus isolated from human in S?o Paulo, Brazil
Santos, Cecília Luiza Sim?es dos;Sallum, Maria Anice Mureb;Franco, Heitor Moreira;Oshiro, Fabíola Maiumi;Rocco, Iray Maria;
Memórias do Instituto Oswaldo Cruz , 2006, DOI: 10.1590/S0074-02762006000100011
Abstract: the molecular characterization of sph253157, a new strain of st. louis encephalitis virus (slev), isolated in 2004 from the first case of human infection recognized in the state of s?o paulo, brazil, is reported. the patient, presenting a febrile illness without neurological involvement, was hospitalized as a probable case of dengue fever. genomic rna was isolated from the supernatant of c6/36 cells infected with acute phase-serum specimen of the patient and the envelope gene was amplified by reverse-transcription-polymerase chain reaction. the complete nucleotide sequence of the envelope gene of this isolate was directly sequenced from the amplified products and compared with other brazilian and american slev strains. phylogenetic analyses were carried out under maximum likelihood criterion with outgroups both included and excluded. outgroups comprised four flavivirus of the japanese encephalitis group. phylogeny also included bayesian analysis. the results indicated that the new slev isolate belongs to lineage iii, being closely related to an argentinean strain recovered from culex sp. in 1979. it is concluded that there are at least 3 lineages of slev in brazil.
An indirect immunofluorescence assay to detect antibodies against St. Louis Encephalitis virus
SPINSANTI, Lorena;RE, Viviana;AGUILAR, Javier;CONTIGIANI, Marta;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2001, DOI: 10.1590/S0036-46652001000600008
Abstract: an in house indirect immmunofluorescence assay ( ifa ) in relation to neutralization (nt) reference test, was assessed as a fast and cheap method to carry out serological surveys for st. louis encephalitis virus (sle). sera obtained from 213 blood donors were analyzed by both tests. the prevalence of seropositivity obtained with ifa was lower than (30.98%) that observed on nt (41.78%). the relative specificity rate of ifa was 96.77% whereas its relative sensitivity rate was 69.66%. kappa index showed a good correlation between both tests. the results indicate that neutralization assay is still the serological test with the highest sensitivity and specificity relative rates for detecting antibodies against sle virus. nevertheless, the ifa could be useful as an alternative test in order to learn the circulation of the flavivirus genus in a certain area.
An indirect immunofluorescence assay to detect antibodies against St. Louis Encephalitis virus
SPINSANTI Lorena,RE Viviana,AGUILAR Javier,CONTIGIANI Marta
Revista do Instituto de Medicina Tropical de S?o Paulo , 2001,
Abstract: An in house indirect immmunofluorescence assay ( IFA ) in relation to neutralization (NT) reference test, was assessed as a fast and cheap method to carry out serological surveys for St. Louis Encephalitis virus (SLE). Sera obtained from 213 blood donors were analyzed by both tests. The prevalence of seropositivity obtained with IFA was lower than (30.98%) that observed on NT (41.78%). The relative specificity rate of IFA was 96.77% whereas its relative sensitivity rate was 69.66%. Kappa index showed a good correlation between both tests. The results indicate that neutralization assay is still the serological test with the highest sensitivity and specificity relative rates for detecting antibodies against SLE virus. Nevertheless, the IFA could be useful as an alternative test in order to learn the circulation of the Flavivirus genus in a certain area.
Brote de encefalitis de San Luis en el área Metropolitana Buenos Aires Outbreack of St. Luis encephalitis in the Metropolitan Buenos Aires Area
Alfredo Seijo,Alejandra Morales,Gladys Poustis,Yamila Romer
Medicina (Buenos Aires) , 2011,
Abstract: Se describen los hallazgos epidemiológicos y clínicos de 13 enfermos con diagnóstico de infección por virus de la encefalitis de San Luis, con transmisión entre enero y marzo de 2010, en el Area Metropolitana Buenos Aires (AMBA). Los 13 enfermos, promedio de edad 38 a os, tuvieron un comienzo agudo caracterizado por hipertermia y cefalea. Entre los días dos y diez de iniciados los síntomas, 7/13 enfermos tuvieron signos y síntomas de compromiso neurológico caracterizado por meningitis sin signos encefálicos en 1/7. En 6/7 los hallazgos más frecuentes fueron: rigidez de nuca, desorientación temporoespacial, fotofobia, confusión y alteración del lenguaje. Dos resonancias magnéticas y un electroencefalograma presentaron signos de afectación de lóbulos temporales. El líquido cefalorraquídeo se caracterizó por pleocitosis con predominio de células mononucleadas, glucorraquia normal y discreto aumento de proteínas. No hubo casos fatales. En 6/13 pacientes la sospecha clínica inicial fue dengue. Por la agrupación espacial y temporal de los casos puede considerarse un brote epidémico, el primero conocido en el AMBA, ya que no se había notificado previamente la circulación epidémica del virus. We describe the epidemiological and clinical findings of 13 patients with diagnosis of infection by St. Louis encephalitis virus, transmitted between January and March 2010 in Buenos Aires Metropolitan Area (AMBA). Thirteen patients, average age 38 years, had an acute onset with hyperthermia and headache. Between days two and ten of the onset of symptoms, 7/13 patients had signs and symptoms of neurological involvement. This was characterized by meningitis without encephalic sings in 1/7 and in 6/7 the most frequent findings were: stiff neck, disorientation, photophobia, confusion and language impairment. Two MR and one EEG revealed signs of involvement of temporal lobes. The cerebrospinal fluid showed pleocytosis with predominance of mononuclear cells, normal glucose and moderately elevated protein. There were no fatalities cases. In 6/13 patients the initial clinical suspicion was dengue. As epidemic virus circulation had not been previously reported in the AMBA it can be considered an outbreak of St. Luis encephalitis for the spatial and temporal clustering of cases.
Review on Infections of the Central Nervous System by St. Louis Encephalitis, Rocio and West Nile Flaviviruses in Brazil, 2004-2014  [PDF]
Mario Luis Garcia de Figueiredo, Luiz Tadeu Moraes Figueiredo
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.413106
Abstract: Rocio (ROCV), Saint Louis encephalitis (SLEV) and West Nile (WNV) are Flavivirus (Flaviviridae) probably carried by birds and transmitted by Culex mosquitoes. We show here a review on infections of the central nervous system by St. Louis Encephalitis, Rocio and West Nile Flaviviruses in Brazil, 2004-2014. In the last 10 years, serologic surveys in horses showed high proportions of seropositive animals which point out that SLEV and ROCV have circulated infecting horses in west-central, southeast and other regions of Brazil and that WNV has been introduced into Brazil and circulates mostly in Pantanal region. However humans infected by WNV have not been reported. In the State of Sao Paulo: SLEV was isolated from a case clinically diagnosed as dengue in 2004; in 2006, 6 SLEV patients including 3 cases of menigoencephalitis were reported in the middle of a large epidemic of dengue type 3; and in 2008, 1 patient with acute febrile illness that was IgM-positive for dengue was found infected by SLEV by detection of the virus genome. In 2010, ROCV genome was detected in the cerebrospinal fluids of 2 patients from the northern region with meningoenchephalitis and also AIDS. This was the first report of infections by ROCV in the last 34 years and curiously, it occured more than 2000 km from where the virus was firstly found. It is necessary to improve the surveillance of SLEV, ROCV and WNV in Brazil.
Studies on mosquitoes (Diptera: Culicidae) and anthropic environment: 10- survey of adult behaviour of Culex nigripalpus and other species of Culex (Culex) in South-Eastern Brazil
Forattini,Oswaldo Paulo; Kakitani,Iná; Massad,Eduardo; Marucci,Daniel;
Revista de Saúde Pública , 1995, DOI: 10.1590/S0034-89101995000400003
Abstract: a survey of adult behaviour of culex (culex) species was carried out from august 1992 through december 1993 in a human modified (anthropic) environment in the ribeira valley, s.paulo state, brazil. culex nigripalpus dominated the catches at several sites and it's tendency to increase in the anthropic environment became quite clear. nevertheless no high level of synanthropy was demonstrated. so it seems that the mosquito may have a restricted role in natural arbovirus cycles. nonetheless, cx. nigripalpus must be considered a potential vector of arboviruses, especially st. louis encephalitis virus outside dwellings.
Studies on mosquitoes (Diptera: Culicidae) and anthropic environment: 10- survey of adult behaviour of Culex nigripalpus and other species of Culex (Culex) in South-Eastern Brazil
Forattini Oswaldo Paulo,Kakitani Iná,Massad Eduardo,Marucci Daniel
Revista de Saúde Pública , 1995,
Abstract: A survey of adult behaviour of Culex (Culex) species was carried out from August 1992 through December 1993 in a human modified (anthropic) environment in the Ribeira Valley, S.Paulo State, Brazil. Culex nigripalpus dominated the catches at several sites and it's tendency to increase in the anthropic environment became quite clear. Nevertheless no high level of synanthropy was demonstrated. So it seems that the mosquito may have a restricted role in natural arbovirus cycles. Nonetheless, Cx. nigripalpus must be considered a potential vector of arboviruses, especially St. Louis encephalitis virus outside dwellings.
Page 1 /8173
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.