Publications

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seroprevalence of neospora caninum in dairy cattle in bahia, brazil.sera collected from 447 dairy cattle on 14 dairy farms were tested for neospora caninum antibodies by use of an immunofluorescent antibody technique. positive reactions with titres > or =1:200 were found in 63 (14.09%) of animals. neospora positive sera were also tested for toxoplasma gondii antibodies by using a commercial latex agglutination test. antibodies to t. gondii were detected in 3 (4.76%) of 63 n. caninum positive sera. these results indicate that n. caninum infection is widespread am ...199910489205
chickens (gallus domesticus) are natural intermediate hosts of neospora caninum.neospora caninum naturally infects many mammal species, but has not previously been demonstrated in birds. we examined sera for n. caninum antibodies from 200 outdoor chickens and from 200 chickens confined indoors in the state of bahia, brazil. seroprevalence was greater in outdoor chickens (23.5% versus 1.5%, p<0.001). pcr testing for n. caninum was positive in six of 10 seropositive chickens. amplicons from two of these were sequenced and had 97-98% nucleotide identity with n. caninum. this f ...200818054356
detection of hammondia heydorni and related coccidia (neospora caninum and toxoplasma gondii) in goats slaughtered in bahia, brazil.hammondia heydorni is a coccidian parasite with an obligatory two host life cycle, with dogs and foxes as definitive hosts, and a number of intermediate hosts, including goats. while infection by this parasite seems to be unassociated with any clinical signs, infection by the closely related parasites neospora caninum and toxoplasma gondii can result in abortion, stillbirths and low yielding in caprine herds. the aim of this work was to investigate the frequency of goats infected with h. heydorn ...200919278786
toxoplasma gondii and neospora caninum in sparrows (passer domesticus) in the northeast of brazil.toxoplasma gondii is a cosmopolitan protozoan parasite of warm-blooded animals that causes high rates of infection in mammals and birds. sparrows (passer domesticus) are synantropic birds which are distributed worldwide. they serve as intermediate hosts for the parasite but are quite resistant to toxoplasmosis. the aims of this study were to determine the frequency of t. gondii infection in sparrows using serologic and molecular tests, and to investigate related parasites, such as neospora canin ...201019879051
investigation of neospora caninum, hammondia sp., and toxoplasma gondii in tissues from slaughtered beef cattle in bahia, brazil.neospora caninum, hammondia sp., and toxoplasma gondii are parasites with morphological and genetic similarities. n. caninum and t. gondii are important abortive agents of cattle and sheep, respectively, and may infect numerous animal species. hammondia sp. is not known to induce disease in animals, but may cause confusion in the identification of closely related coccidia. the aim of this study was to investigate infection rates caused by n. caninum, hammondia sp., and t. gondii in beef cattle u ...201019943064
toxoplasmatinae parasites in bats from bahia state, brazil.toxoplasma gondii and neospora caninum are widespread cyst-forming coccidian parasites of the subfamily toxoplasmatinae that infect a wide range of wild and domestic animals. whereas t. gondii is a zoonotic disease, n. caninum is restricted to nonhuman animals. some chiropteran species can be infected by t. gondii and present fatal toxoplasmosis. in most cases, t. gondii -infected bats are believed to remain asymptomatic and to act as an infection source to other animals. it is not known whether ...201727705102
brazilian donkeys (equus asinus) have a low exposure to neospora spp.donkeys (equus asinus) are closely related to horses and are known to be infected by several equine pathogens. neospora caninum and neospora hughesi are protozoan parasites that infect horses, but they were not confirmed in donkeys up to this date. the aim of this study was to evaluate the exposure of donkeys (equus asinus) to neospora spp. using tachyzoites of n. caninum as antigen and employing two common serologic methods, ifat and immunoblot. sera from 500 donkeys were obtained from 30 munic ...201526444065
frequency of antibodies against sarcocystis neurona and neospora caninum in domestic cats in the state of bahia, brazil.sarcocystis neurona is the major agent of equine protozoal myeloencephalitis. it infects several mammalian species in the americas, where the definitive hosts, marsupials of the genus didelphis (d. virginiana and d. albiventris) are found. domestic cats are one of the confirmed intermediate hosts of the parasite; however, antibodies against s. neurona had never before been demonstrated in brazilian cats. the aim of this study was to determine whether cats in bahia, brazil, are exposed to the par ...201725517534
pathogenicity of nc-bahia and nc-1 strains of neospora caninum in experimentally infected cows and buffaloes in early pregnancy.neospora caninum is a protozoan parasite known as an important cause of bovine abortion worldwide. little is currently known about how different strains of n. caninum vary in their pathogenicity. in this study, we compared a brazilian strain, nc-bahia, with the first isolate of this coccidian, nc-1. eight cows and seven buffaloes were submitted to fixed-time artificial insemination protocols for a better control of pregnancy. group 1 was inoculated with nc-bahia (n = 8; five cows and three buffa ...201424562816
molecular frequency and isolation of cyst-forming coccidia from free ranging chickens in bahia state, brazil.the toxoplasmatinae parasites toxoplasma gondii, neospora caninum and hammondia spp. have carnivores as definitive hosts that shed the parasite oocysts in their feces. birds that feed directly from the soil, such as chickens, are exposed to infection and may serve as indicators of the presence of the parasite in the environment and as a source of infection for other animals. the aims of this study were to determine the frequency of infection by these parasites in free ranging chickens, to test w ...201222673105
sarcocystis neurona and neospora caninum in brazilian opossums (didelphis spp.): molecular investigation and in vitro isolation of sarcocystis spp.sarcocystis neurona and neospora spp. are protozoan parasites that induce neurological diseases in horses and other animal species. opossums (didelphis albiventris and didelphis virginiana) are definitive hosts of s. neurona, which is the major cause of equine protozoal myeloencephalitis (epm). neospora caninum causes abortion in cattle and infects a wide range of animal species, while n. hughesi is known to induce neurologic disease in equids. the aims of this study were to investigate s. neuro ...201728807293
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