RESUMO
Sentinel herds were monitored for the detection of bluetongue (BT)-specific antibodies and virus over two periods, namely: June 1999 to August 2000 and September 2000 to April 2001. Herds were located in Santo Tomé (Herds 1 and 2) where BTV activity was known to occur. From June 1999 to August 2000, the cumulative incidence (CI) of bluetongue virus (BTV) infection was 0% and 35% in Herds 1 and 2, respectively. In the second period, the CI of BTV infection was 10% and 97% in Herds 1 and 2, respectively. The virus was isolated from red blood cells of animals that seroconverted and was identified as serotype 4. Averages of the monthly maximal temperatures were always above 19 degrees C. However, averages of the monthly median temperatures were below 19 degrees C and averages of the monthly minimal temperatures were below 15 degrees C from May 2000 to August 2000. There was no viral activity detected at that time. Culicoides insignis was identified as the predominant potential vector species (99%) trapped near sentinel herds. Although clinical disease has never been reported in Argentina, viral activity was detected and the virus has been isolated in sentinel herds.
RESUMO
Bluetongue (BT) is a viral disease of domestic and wild ruminants. It is particularly damaging in sheep, where up to half of infected animals may die, showing inflammation and hemorrhages of the mucous membranes of the mouth, nose, and intestines. In cattle and goats, BT rarely causes disease, however it can affect the animal's reproductive ability, so that losses are not easily estimated. Bluetongue virus spreads from animal to animal by biting insects of the genus Culicoides; and this is the reason why the disease is more prevalent in geographic areas where climate conditions are favourable for their development. The disease was first recognized in South Africa in the late 1700's, but it was not until the early 1900's that it was described in detail, and at present, epizootiology and pathogenesis studies are still being carried on.
Assuntos
Vírus Bluetongue , Bluetongue , Aborto Animal/etiologia , Aborto Animal/virologia , Animais , Antígenos Virais/imunologia , Argentina/epidemiologia , Bluetongue/diagnóstico , Bluetongue/etiologia , Bluetongue/história , Bluetongue/prevenção & controle , Vírus Bluetongue/classificação , Vírus Bluetongue/isolamento & purificação , Vírus Bluetongue/fisiologia , Ceratopogonidae/virologia , Feminino , Doenças Fetais/veterinária , Doenças Fetais/virologia , História do Século XVII , História do Século XIX , História do Século XX , Infertilidade Masculina/veterinária , Infertilidade Masculina/virologia , Insetos Vetores , Masculino , RNA Viral/análise , Ruminantes , Proteínas Virais/imunologia , Vacinas ViraisRESUMO
Bluetongue (BT) is a viral disease of domestic and wild ruminants. It is particularly damaging in sheep, where up to half of infected animals may die, showing inflammation and hemorrhages of the mucous membranes of the mouth, nose, and intestines. In cattle and goats, BT rarely causes disease, however it can affect the animal's reproductive ability, so that losses are not easily estimated. Bluetongue virus spreads from animal to animal by biting insects of the genus Culicoides; and this is the reason why the disease is more prevalent in geographic areas where climate conditions are favourable for their development. The disease was first recognized in South Africa in the late 1700's, but it was not until the early 1900's that it was described in detail, and at present, epizootiology and pathogenesis studies are still being carried on.
Assuntos
Animais , Masculino , Feminino , Bluetongue , Vírus Bluetongue , Aborto Animal , Antígenos Virais/imunologia , Argentina , Bluetongue , Ceratopogonidae , Doenças Fetais/veterinária , Doenças Fetais/virologia , Infertilidade Masculina , Insetos Vetores , Proteínas Virais/imunologia , RNA Viral , Ruminantes , Vacinas Virais , Vírus Bluetongue/classificação , Vírus Bluetongue/isolamento & purificação , Vírus Bluetongue/fisiologiaRESUMO
Bluetongue (BT) is a viral disease of domestic and wild ruminants. It is particularly damaging in sheep, where up to half of infected animals may die, showing inflammation and hemorrhages of the mucous membranes of the mouth, nose, and intestines. In cattle and goats, BT rarely causes disease, however it can affect the animals reproductive ability, so that losses are not easily estimated. Bluetongue virus spreads from animal to animal by biting insects of the genus Culicoides; and this is the reason why the disease is more prevalent in geographic areas where climate conditions are favourable for their development. The disease was first recognized in South Africa in the late 1700s, but it was not until the early 1900s that it was described in detail, and at present, epizootiology and pathogenesis studies are still being carried on.(AU)
Assuntos
Animais , Masculino , Feminino , Bluetongue , Vírus Bluetongue , Aborto Animal/etiologia , Aborto Animal/virologia , Antígenos Virais/imunologia , Argentina/epidemiologia , Bluetongue/diagnóstico , Bluetongue/etiologia , Bluetongue/história , Bluetongue/prevenção & controle , Vírus Bluetongue/classificação , Vírus Bluetongue/isolamento & purificação , Vírus Bluetongue/fisiologia , Ceratopogonidae/virologia , Doenças Fetais/veterinária , Doenças Fetais/virologia , Infertilidade Masculina/veterinária , Infertilidade Masculina/virologia , Insetos Vetores , RNA Viral/análise , Ruminantes , Proteínas Virais/imunologia , Vacinas ViraisRESUMO
Bluetongue (BT) is a viral disease of domestic and wild ruminants. It is particularly damaging in sheep, where up to half of infected animals may die, showing inflammation and hemorrhages of the mucous membranes of the mouth, nose, and intestines. In cattle and goats, BT rarely causes disease, however it can affect the animals reproductive ability, so that losses are not easily estimated. Bluetongue virus spreads from animal to animal by biting insects of the genus Culicoides; and this is the reason why the disease is more prevalent in geographic areas where climate conditions are favourable for their development. The disease was first recognized in South Africa in the late 1700s, but it was not until the early 1900s that it was described in detail, and at present, epizootiology and pathogenesis studies are still being carried on.
RESUMO
An indirect enzyme-linked immunosorbent assay (IELISA), a competitive ELISA (CELISA), and a fluorescence polarization assay (FPA) for the presumptive serological diagnosis of swine brucellosis were evaluated using two populations of swine sera: sera from brucellosis-free Canadian herds and sera from Argentina selected based on positive reactions in the buffered antigen plate agglutination test (BPAT) and the 2-mercaptoethanol (2-ME) test. In addition, sera from adult swine from which Brucella suis was isolated at least once for each farm of origin were evaluated. The IELISA, CELISA, and FPA specificity values were 99.9, 99.5, and 98. 3%, respectively, and the IELISA, CELISA, and FPA sensitivity values relative to the BPAT and the 2-ME test were 98.9, 96.6, and 93.8%, respectively. Actual sensitivity was assessed by using 37 sera from individual pigs from which B. suis was cultured, and the values obtained were as follows: BPAT, 86.5%; 2-ME test, 81.1%; IELISA, 86.5%; CELISA, 78.5%; and FPA, 80.0%.