Browsing by Author "Cardoso, Luís"
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- Análise geoespacial aplicada ao rastreio sero-epidemiológico da leishmaniose canina na região centro de PortugalPublication . Pires, Humberto; Cortes, Helder; Nunes, Telmo; Monteiro, Fernando; Cardoso, Luís; Matos, Ana Cristina; Martins, Manuel
- Coxiella burnetii in wild birds from EuropePublication . Loureiro, Filipa; Cardoso, Luís; Matos, Ana Cristina; Matos, Manuela; Coelho, Ana CláudiaCoxiella burnetii is a highly infectious bacterium responsible for causing Q fever, an emerging public health problem of global concern and the cause of severe economic losses in livestock farming. Many species can be asymptomatic carriers and shed this bacterium in various secretions and excreta. Humans can acquire the infection mainly through environmental contamination due to bacterial shedding of infected animals, and through tick-borne or foodborne transmissions. If this agent is aerosolized, it is considered a potential biological weapon. Advanced molecular and serological diagnostic techniques for Q fever over the last decade have made it possible to detect clinical cases and carry out population screening effectively. There needs to be more research on C. burnetii control in wildlife despite the increasing evidence that wildlife is a source of C. burnetii for both domestic animals and humans. Birds can transmit this pathogen directly or indirectly to other animals or humans, but data about the spreading of C. burnetii in avian populations still need to be available. The present work aimed to revise the literature about the involvement of wild birds in the epidemiology of Q fever in Europe. Reports of this pathogenic agent in wild birds in European countries since 2007 were considered.
- Estudo sero-epidemiológico da Leishmaniose canina na Região da Cova da BeiraPublication . Coelho, Susana; Cardoso, Luís; Brancal, Hugo; Martins, Manuel; Matos, Ana CristinaA leishmaniose canina é uma zoonose parasitária transmitida quase exclusivamente através da picada de minúsculos insectos parasitados, do género Phlebotomus. Actualmente assume-se como um importante problema não só do ponto de vista veterinário como também de saúde pública (Martínez-Moreno, et al., 1999; Cardoso et al., 2004). Dado o facto dos canídeos serem um dos elos da cadeia epidemiológica da leishmaniose no nosso país, o objectivo deste trabalho foi avaliar a prevalência da leishmaniose canina na região da Cova da Beira, e determinar se efectivamente é uma região endémica.
- Estudo sero-epidemiológico da leishmaniose canina na região da Cova da Beira : resultados preliminaresPublication . Brancal, Hugo; Matos, Ana Cristina; Brida, Telma; Venâncio, Raquel; Martins, Manuel; Cardoso, LuísEstudo sero-epidemiológico da leishmaniose canina na região da Cova da Beira : resultados preliminares.
- Estudo sero-epidemiológico da leishmaniose canina no concelho de Mação : resultados preliminaresPublication . Brancal, Hugo; Matos, Ana Cristina.; Monteiro, Fernando; Brida, Telma; Martins, Manuel; Castelo-Branco, Miguel; Cardoso, LuísA leishmaniose causada por Leishmania infantum é uma zoonose de ampla distribuição mundial. Os cães são considerados o principal reservatório para a infecção humana. Um aumento apreciável do número de casos de infecção e doença caninas tem sido registado na maioria dos países do sul da Europa. O diagnóstico da infecção por L. infantum em cães é um pré-requisito para o maneio clínico de animais infectados e doentes e, em simultâneo, uma potencial medida de vigilância e controlo da leishmaniose visceral humana (Martinez-Moreno et al.,1999).
- Evidence for sporadic Coxiella burnetii excretion in sheep milk, central PortugalPublication . Pires, Humberto; Silva, S. Santos; Cruz, A.; Cardoso, Luís; Lopes, A.P.; Pereira, M.A.; Nóbrega, C.; Mega, A.C.; Santos, C.; Cruz, R.; Esteves, F.; Vala, H.; Matos, Ana; Barradas, P.F.; Coelho, A.C.; Mesquita, J.R.Coxiella burnetii, the causative agent of Q fever, is a globally distributed zoonosis, with cattle, sheep, and goats considered the main reservoirs of the disease (Agger et al,., 2013; Bento et al., 2023). Human transmission primarily occurs through inhaling infections aerosols from milk, faeces, urina, and birth products from infected ruminants. This study used a 2-year longitudinal approach to investigate C. burnetii excretion in bulk tank milk samp+les from sheep in central Portugal.
- Geospatial analysis applied to seroepidemiological survey of canine leishmaniosis in east-central PortugalPublication . Pires, Humberto; Martins, Manuel; Matos, Ana Cristina; Cardoso, Luís; Monteiro, Fernando; Roque, Natália; Nunes, Telmo; Gottstein, Bruno; Cortes, HelderDespite the high prevalence of canine Leishmania infantum infection in Portugal, significant differences associated with different risk factors can be found between geographically contiguous areas. In this study, a geographical area within the central region of Portugal (municipalities of Proença-a-Nova, Mação and Vila de Rei) was investigated. An epidemiological survey involved the analysis by an indirect enzyme-linked immunosorbent assay of serum samples collected during the anti-rabies vaccination campaign from 282 dogs. Geospatial analysis showed the distribution of geospatial prevalence of leishmaniosis and has delimited two areas (clusters) with a statistically significant higher risk of seropositivity in dogs (p = 0.003 and p = 0.027, for clusters 1 and 2, respectively). The highest seroprevalence (56.0%; CI: 41.2-70.0) was found in Vila de Rei. Five land occupation types showed a possible influence on the geographic distribution of seropositivity, with statistically significant differences between seropositive and seronegative dogs. Land occupied by temporary irrigated crops (p = 0.026), olive groves (p = 0.013), complex cultural systems and parcelling (p = 0.021), open forests, logging and new plantations (p = 0.043) and watercourses (p = 0.012) influenced the geographical distribution of canine Leishmania infection. Seropositive dogs had a greater average area of occupied land (i.e. open forests, logging and new plantations) than the seronegative ones (3.1439 km2 versus 2.5650 km2, respectively; p = 0.043).
- High seroprevalence of Brucella spp. in wild boar and red deer in the Centre of PortugalPublication . Pires, Humberto; Matos, Manuela; Cardoso, Luís; Lopes, Ana Patrícia; Fontes, Maria da Conceição; Pintado, Cristina Santos; Figueira, Luís; Matos, Ana Cristina; Mesquita, João Rodrigo; Coelho, Ana CláudiaHigh seroprevalence of Brucella spp. in wild boar and red deer in the Centre of Portugal.
- Hunting for answers: Assessing Brucella spp. seroprevalence and risks in red deer and wild boar in Central PortugalPublication . Pires, Humberto; Cardoso, Luís; Lopes, Ana Patrícia; Fontes, Maria da Conceição; Silva, Sérgio Santos; Matos, Manuela; Pintado, Cristina Santos; Roque, Natália; Fonseca, Leonardo Filipe; Morgado, Inês; Dias, Ana Sofia; Figueira, Luis; Matos, Ana Cristina; Mesquita, João Rodrigo; Coelho, Ana CláudiaBetween 2016 and 2023, a cross-sectional study was conducted in the central region of Portugal in order to better understand the epidemiology and public health risks resulting from the handling and consumption of game animals infected with Brucella spp. The seroprevalence and risk factors for Brucella spp. seropositivity were evaluated. Antibodies against Brucella spp. were determined using a commercial enzyme-linked immunosorbent assay (ELISA) according to the manufacturer’s instructions. Results showed that in the 650 serum samples collected from red deer (n = 298) and wild boars (n = 352) in Portugal, 21.7% (n = 141; 95% CI: 18.6–25.1%) tested positive. Wild boar had a significantly higher prevalence (35.5%; 95% CI: 30.5–40.8%) than red deer (5.4%, 95% CI: 3.1–8.6%; p ≤ 0.001). Risk factors for seropositivity were investigated using multivariable logistic regression models. The odds of being seropositive was 8.39 (95% CI: 4.75–14.84; p ≤ 0.001) times higher in wild boar than in red deer. Correlations between sex, age, body condition, and seropositivity could not be observed. The higher seroprevalence in wild boar suggests that this species may primarily contribute to the Brucella spp. ecology in central Portugal
- Is Coxiella burnetii circulating in wild birds in the North of Portugal?Publication . Loureiro, Filipa; Cardoso, Luís; Matos, Ana Cristina; Pintado, Cristina Santos; Silva, Filipe; Matos, Manuela; Coelho, Ana CláudiaCoxiella burnetii is the causative agent of Q fever, a zoonosis of important public health concern, and a disease that has a serious economic impact on the production of farm animals. The role of birds as vectors of bacteria and other pathogens to farm animals has been suggested, thorough environmental contamination of pasturelands, water supplies and feed by avian drops. Migratory birds might also be the mean of transport to infected ticks, posing a risk to humans and animals. Although it is known that birds are potential reservoirs of C. burnetii, their role in the epidemiological cycle of the pathogen is still scarce and has not been described in Portugal so far. A survey was conducted for the detection of antibodies against C. burnetii in samples from 92 wild birds, collected in a wildlife rehabilitation centre in Northeastern Portugal. A commercial enzyme-linked immunosorbent assay (ELISA; IDVet®, Montpellier, France) was used to detect antibodies specific to C. burnetii, according to the manufacturer’s instructions. No samples tested positive. Results of the present study indicate that antibodies against C. burnetii were absent in the study population, but further analysis are needed to be able to infer the true seroprevalence of this bacterium in wild birds in the country.
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