Departamento de Zootecnia, Engenharia Rural e Veterinária (DZERV)
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Browsing Departamento de Zootecnia, Engenharia Rural e Veterinária (DZERV) by Author "Abreu-Silva, Joana"
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- Prevalence of hepatitis E virus antibodies in workers occupationally exposed to swine in PortugalPublication . Teixeira, J.; Mesquita, J. R.; Pereira, S. S.; Oliveira, R. M. S.; Abreu-Silva, Joana; Rodrigues, A.; Myrmel, M.; Stene-Johansen, K.; Øverbø, J.; Gonçalves, G.; Nascimento, M. S. J.The concept of zoonotic hepatitis E in industrialized countries has emerged with the discovery of swine strains of hepatitis E virus (HEV) genotype 3, closely related to human HEV. Different routes of zoonotic HEV transmission have been recognized, including contact with infected pigs. Workers occupationally exposed to swine (WOES) have been considered a risk group for HEV infection, but contradictory results have been reported. In the present study, we searched for anti-HEV IgG in WOES (butchers, slaughterhouse workers, veterinarians and pig farmers; n = 114) and in the general population (n = 804) in order to investigate the potential occupational risk of zoonotic HEV infection in this work group. A significantly higher (p = 0.008) anti-HEV IgG seroprevalence was found in WOES (30.7 %) when compared with the general population (19.9 %). Multivariate analysis showed that having professions with exposure to pigs for more than 16.5 years was a risk factor for being positive for anti-HEV IgG (aOR of 5.4, 95 % CI 1.9-15.6, p = 0.002). To our knowledge, this is the first study on the prevalence of anti-HEV IgG in WOES in Portugal, also showing increased probability for infection in this group.
- Serological Evidence for Schmallenberg Virus Infection in Sheep of Portugal, 2014Publication . Esteves, Fernando; Mesquita, João; Vala, Helena; Abreu-Silva, Joana; van der Poel, Wim H M; Nascimento, Maria S JBetween November and December of 2014, a serosurvey was set up to evaluate the presence of Schmallenberg virus (SBV) antibodies in sheep of Portugal. Sera (n = 1068) were tested using an indirect enzyme linked immunosorbent assay (ID Screen(®) Schmallenberg virus indirect, IDvet Innovative Diagnostics, Montpellier, France). The estimated occurrence of immunogobulin G (IgG) antibodies against SBV in sheep of Portugal was 12.8% (95% confidence interval 11.0-15.0%). This is the first study reporting the presence of SBV antibodies in sheep of Portugal.
- Seroprevalence of Hepatitis E Virus Antibodies in Portuguese ChildrenPublication . Oliveira, Ricardo; Mesquita, João R.; Pereira, Sara; Abreu-Silva, Joana; Teixeira, Joana; Nascimento, Maria São JoséHepatitis E virus (HEV) has become a growing Public Health concern in industrialized countries. Most of the HEV seroprevalence studies have focused on adult populations and reports regarding HEV seroepidemiology among children are scarce in these countries. The aims of the present work were to perform a nationwide seroprevalence study on HEV infection in Portuguese children and to compare the HEV seropositivity in this 2015 children cohort with results in sera performed 20 years earlier.