Navegando por Autor "FONSECA, Adivaldo Henrique da"

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Acesso aberto (Open Access)
Detecção sorológica e molecular de Anaplasma marginale em búfalos na Ilha de Marajó, Pará
(2014-01) SILVA, Jenevaldo Barbosa da; LOPES, Cinthia Távora de Albuquerque; SOUSA, Melina Garcia Saraiva de; GIBSON, André Felipe Bagarrão; VINHOTE, Wagner Marcelo de Souza; FONSECA, Adivaldo Henrique da; ARAÚJO, Flábio Ribeiro de; BARBOSA NETO, José Diomedes
The aim of the study was to test the molecular and serological prevalence of Anaplasma marginale in water buffaloes of the Marajó Island, State of Pará, Brazil. For serologic research were randomly selected 800 buffaloes and for molecular research 50 of these animals were randomly chosen. To quantify the serological prevalence we used the indirect enzyme linked immunosorbent assay (iELISA) with total antigen containing proteins outer surface. To quantify the prevalence molecular was used the polymerase chain reaction (PCR) involving gene amplification fragment larger surface protein 5 (MSP5). The prevalence of positive animals in iELISA was 25% (200/800). In the PCR we detected the presence of A. marginale in 2% (1/50) of animals. Although only one animal was positive in PCR, we found that it was negative in ELISA. The presence of the agent, even in low prevalence, shows that buffaloes can act as an important reservoir for transmission of the pathogen to cattle in northern Brazil.
Acesso aberto (Open Access)
Detection of anti-Borrelia burgdorferi antibodies in buffaloes (Bubalus bubalis) in the state of Pará, Brazil
(Universidade Federal do Pará, 2012-09) CORRÊA, Fabíola do Nascimento; TEIXEIRA, Rafaella Câmara; OLIVEIRA, Carlos Magno Chaves; BARBOSA NETO, José Diomedes; FONSECA, Adivaldo Henrique da
This study aimed to investigate the frequency of homologous antibodies of IgG class against Borrelia burgdorferi in buffaloes in the state of Pará, Brazil. Blood serum samples from 491 buffaloes were analyzed by means of the indirect ELISA test, using crude antigen produced from a cultivar of the North American strain G39/40 of B. burgdorferi. There were 412 positive samples (83.91%), and there was no statistically significant difference in the proportions of positive animals between the 81.69% (232/284) originating from Marajó Island and the 86.96% (180/207) from the continental area of the state of Pará. In all the municipalities studied, the frequency of positive findings of antibodies against B. burgdorferi among the animals ranged from 63.6% to 92.9%. The high numbers of seropositive animals can be explained by the frequent presence of the tick Rhipicephalus (Boophilus) microplus, and by the possible existence of spirochetes of the genus Borrelia infecting buffaloes in the region studied, although specific studies are needed to confirm this relationship. These factors suggest that a cross-reaction exists between the North American strain G39/40 of B. burgdorferi, which is used as an antigenic substrate, and the species of Borrelia spp. that possibly infects buffaloes in the state of Pará.
Acesso aberto (Open Access)
Freqüência de anticorpos homólogos anti-Borrelia burgdorferi em eqüinos na mesorregião metropolitana de Belém, Estado do Pará
(2009-03) GALO, Katiany Rocha; FONSECA, Adivaldo Henrique da; MADUREIRA, Renata Cunha; BARBOSA NETO, José Diomedes
Spirochaetes transmitted by ticks are microorganisms of worldwide distribution, which infect wild, domestic animals and human beings. A total of 300 equine sera from four municipalities: Ananideua (58), Belém (61), Castanhal (131), and Santa Izabel do Pará (50), were evaluated for Borrelia burgdorferi by an Elisa test. There were no significant differences (P<0.05) among municipalities, breed, sex or husbandry. A total of 80 (26.7%) horses were B. burgdorferi positive with titles of 1:800, 72 (90%) horses, 1:1.600, 6 (7.5%) horses, and 1:3.200, 2 (2.5%) horses. The results were similar to those in the USA, where related frequencies ranged from 7 to 75% in asymptomatic seropositive horses. The presence of anti-B.burgdorferi homologous antibodies in horses from four municipalities in the metropolitan mesorregion of Belém suggests the possibility of occurrence of human cases in the region.
Acesso aberto (Open Access)
Frequency of antibodies to Babesia bigemina, B. bovis, Anaplasma marginale, Trypanosoma vivax and Borrelia burdgorferi in cattle from the northeastern region of the state of Pará, Brazil
(2008-06) GUEDES JUNIOR, Daniel da Silva; ARAÚJO, Flábio Ribeiro de; SILVA, Fábio Jorge Moreira da; RANGEL, Charles Passos; BARBOSA NETO, José Diomedes; FONSECA, Adivaldo Henrique da
Babesiosis, anaplasmosis, and trypanosomosis are relevant diseases, potentially causing morbidity in cattle, leading to economic losses. Borreliosis is import as a potential zoonosis. The objective of this study was to determine, by indirect enzyme-linked immunosorbent assay (ELISA), the frequency of seropositive cattle to Babesia bigemina, B. bovis, Anaplasma marginale, Trypanosoma vivax and Borrelia burgdorferi in cattle from the Northeastern region of Pará, Brazil. Sera samples from 246 female adult cattle from municipalities of Castanhal and São Miguel do Guamá were used. Crude antigens ELISAs were used to detect antibodies to all agents, except to A. marginale, to which an indirect ELISA with recombinant major surface 1a protein (MSP1a) antigen was used. Overall frequencies of seropositive animals were: B. bigemina - 99.2%; B. bovis - 98.8%; A. marginale - 68.3%; T. vivax - 93.1% and B. burgdorferi - 54.9%. The frequencies of seropositive cattle to B. bovis and B. bigemina suggest a high rate of transmission of these organisms by tick in the studied region, which can be classified as enzootically stable to these hemoprotozoans. The low frequency of seropositive cattle to A. marginale may be attributed to a lower sensitivity of the recombinant antigen ELISA utilized or a distinct rate of inoculation of this rickettsia by ticks, as compared with Babesia sp. transmission. The high frequency of seropositive cattle to T. vivax indicates that this hemoprotozoan is prevalent in herds from the Northeastern region of Pará. The rate of animal that showed homologues antibodies to B. burgdorferi indicates the presence of the tickborne spirochaetal agent in the cattle population in the studied region.
Acesso aberto (Open Access)
Prevalência de anticorpos anti-Toxoplasma gondii em búfalos (Bubalus bubalis) no estado do Pará
(2013-05) SILVA, Jenevaldo Barbosa da; FONSECA, Adivaldo Henrique da; ANDRADE, Stefano Juliano Tavares de; SILVA, André Guimarães Maciel e; OLIVEIRA, Carlos Magno Chaves; BARBOSA NETO, José Diomedes
The aim was to study the seroprevalence of Toxoplasma gondii in water buffaloes (Bubalus bubalis) from State of Pará, Brazil. Three hundred and nineteen buffaloes were randomly selected into seven municipalities of Marajó Island. For comparative purposes, 128 buffaloes of five municipalities in the state of Pará were also evaluated. The seroprevalence of T. gondii was evaluated by Indirect Enzyme Linked Immunosorbent Assay (iELISA). The samples diagnosed as positive in iELISA were subjected to Immunofluorescence Antibody Test (IFAT). We evaluated risk factors: location, breed, pregnancy and co-infection with Brucella abortus or Mycobacterium bovis. The frequency of animals positive for T. gondii in iELISA were compared by chi-square (χ2) with 95% confidence. Variables with p <0.2 were subjected to logistic regression analysis; the model was built based on the "odds ratios" test. The prevalence of T. gondii in iELISA was 41,6% (186/447). In IFAT, 86,5% (161/186) had their positivity for T. gondii confirmed. The average prevalence in the municipalities of the Marajó Island and of the mainland was 32% (103/319) and 55% (70/128), respectively. The municipalities with the highest prevalence were Soure (53%) and Salvaterra (49%) in Marajó Island, and Castanhal (55%) and Thailândia (50%) in the Continent. The breed and co-infection with Brucella abortus or Mycobacterium bovis presented no influence on the prevalence of T. gondii. Additionally, pregnant animals were 57% more positive for T. gondii than nonpregnant animals. The presence of antibodies is an indicative of T. gondii in buffaloes in the state of Pará, and these findings represent a risk not only for farm animals, but to public health as a source of infection.
Acesso aberto (Open Access)
Prevalência sorológica e molecular de Babesia bovis e Babesia bigemina em búfalos (Bubalus bubalis) na Ilha de Marajó, Pará
(2013-07) SILVA, Jenevaldo Barbosa da; LOPES, Cinthia Távora de Albuquerque; PINHEIRO, Cleyton Prado; LIMA, Danillo Henrique da Silva; SILVA, Roberto S. L.; FONSECA, Adivaldo Henrique da; ARAÚJO, Flábio Ribeiro de; BARBOSA NETO, José Diomedes
The aim of the study was to estimate the prevalence of Babesia bovis and Babesia bigemina in water buffaloes of the Marajó Island, State of Pará, Brazil. We used an indirect enzyme-linked immunosorbent assay (iELISA), with total antigen containing proteins outer surface, and polymerase chain reaction (qPCR), involving the use of SYBR Green based on amplification of a small fragment of the cytochrome b gene. The prevalence of positive animals in iELISA to B. bovis B. bigemina and mixed infection was 24.87% (199/800), 20.75% (166/800) and 18.75% (150/800), respectively. Using the PCR, the presence of B. bovis was detected in 15% (18/199) and B. bigemina in 16% (19/199) of animals, and of these, 58% (11/19) presented co-infected by the two agents. The results show a low prevalence of antibodies anti-B. bovis and anti-B. bigemina in water buffaloes from Marajó Island. However, it was observed that the agents of bovine babesiosis circulate in buffaloes, and these may act as reservoirs.