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Serological evidence of West Nile virus circulation in Portugal
Barros C. S., Sílvia; Fevereiro, MiguelThe circulation of West Nile virus in Portugal was assessed by serological surveys conducted during 2004–2010 in horses and birds. The detection of WNV antibodies in both species in all the years covered by the study as well as the presence of anti-WNV IgM in symptomatic horses that had not traveled outside the country, support the notion that WNV circulates in Portugal.
Multiyear surveillance of Influenza A virus in wild birds in Portugal
Henriques, Ana Margarida; Fevereiro, MiguelThis report presents the results of a multiyear (2005 to 2009) study of avian influenza virus (AIV) occurrence in wild birds in Portugal. A total of 5691 samples from wild birds belonging to 13 different orders were examined. Ninety-three samples tested positive for AIV by matrix reverse transcriptase-polymerase chain reaction, giving a total prevalence of 1.63%. Twenty-one viruses were successfully cultured in...
Molecular study of Porcine Circovirus type 2 circulating in Portugal
Henriques, Ana Margarida; Fevereiro, MiguelPorcine circovirus type 2 (PCV2) belongs to the genus Circovirus of the Circoviridae family and has been associated with a disease named postweaning multisystemic wasting syndrome (PMWS). In Portugal the disease caused severe problems mainly between 1995 and 2003, but is nowadays less evident probably as the result of vaccination programmes initiated in 2007. This study reports the molecular analysis of 22 PCV2...
Avian poxvirus infection in a flamingo of the Lisbon Zoo
Henriques, Ana Margarida; Fevereiro, MiguelOs vírus pox aviários (AP) são membros do género Avipoxvirus da família Poxviridae que encontram espalhados pelo mundo numa variedade de hospedeiros. São vírus muito grandes, encapsulados, ovais ou em forma de tijolo que contêm um genoma de DNA linear em cadeia dupla. Os vírus AP são responsáveis por uma doença vulgarmente conhecida como varíola, caracterizada por duas formas principais (respiratória e cutânea)...
Detection of very virulent infectious bursal disease virus in vaccinated broilers
Fagulha, Teresa; Fevereiro, MiguelInfectious bursal disease (IBD), usually referred as Gumboro disease, is an acute and highly contagious immunosuppressive disease of young chickens. The etiological agent is infectious bursal disease virus (IBDV), a nonenveloped, icosahedral virus of the Birnaviridae family with a bisegmented, double-stranded RNA genome. The clinical signs are usually observed between 3 and 6 weeks and include whitish or watery...
Resultados serológicos que demonstram a ocorrência de infecções pelo vírus do N...
Fevereiro, MiguelO vírus West Nile (WNV) foi originalmente identificado no distrito West Nile no Uganda, tendo sido isolado pela primeira vez em 1937. No ciclo biológico deste flavivírus estão envolvidos mosquitos e aves que servem de multiplicadores e reservatório de vírus. Os humanos e equinos são hospedeiros acidentais e finais. Os primeiros surtos epidémicos de encefalite provocados pelo WNV em humanos e equinos registaram-...
Development of West Nile equine antibody ELISAs based of the E and NS1 viral re...
Sílvia C. S., Barros; Fevereiro, MiguelObjectives: West Nile virus (WNV) is a vector-borne Flavivirus that is transmitted in an enzootic cycle between birds and by mosquitoes; incidental transmission to humans and horses occurs during periods of intense viral amplification (Castillo-Olivares et al., 2004). Mosquitoes of the genus Culex are the main vectors of WNV. A Previous study demonstrated that WNV circulates in Portugal at least since 2004 (Bar...
Genótipo QX-like do vírus da bronquite infecciosa detectado em Portugal
Fagulha, Teresa; Fevereiro, MiguelO vírus da bronquite infecciosa (IB) pertence ao género Gammacoronavirus da família Coronaviridae e é o agente etiológico da bronquite infecciosa, uma doença aguda e altamente contagiosa dos tractos respiratório superior e urogenital de galinhas de todas as idades, responsável por perdas económicas consideráveis dentro da indústria avícola. Os sintomas incluem desconforto respiratório, estertores traqueais, esp...
Herpesvirus dos Equinos: Isolamento de uma estirpe de EHV-1 não neuropatogénica
Fevereiro, MiguelOs Herpesvirus 1 e 4 dos equinos (EHV-1 e EHV-4) estão associados a várias patologias, incluindo rinopneumonia, abortos e ocasionalmente mieloencefalopatias. Estes dois vírus são enzoóticos na população de equinos como o demonstram as elevadas taxas de seropositividade. A imunidade resultante da infecção é de curta duração e os animais convalescentes são susceptíveis a reinfecção após alguns meses. O diagnóstic...
SEROLOGIC AND VIROLOGICAL EVIDENCE OF PARVOVIRUS CIRCULATION IN WILD BOARS IN P...
Duarte, Margarida; Fevereiro, MiguelWild boars (Sus scrofa) are indigenous species in many countries and can act as reservoirs for important infectious diseases in domestic pigs. The increase in wild boar population observed in several European Countries such as Portugal, Spain, Italy and Germany higher the risk of transmission of diseases between these species particularly in free-ranging production regions. Our objective was to infer about the...
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