Seroprevalence of antibodies to Chlamydophila abortus in ovine in the State of Alagoas, Brazil

Pinheiro, José Wilton; Piatti, Rosa Maria; Oliveira, Andréa Alice da Fonseca; Silva, Aline Melo da; Abreu, Silvio Romero de Oliveira; Anderlini, Giulliano Aires; Valença, Rômulo Menna Barreto

doi:10.1590/s1517-83822010000200015

Cited by 15 publications

(1 citation statement)

References 7 publications

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“…The occurrence of C. abortus in herds of small ruminants has already been confirmed in some Brazilian states [7][8][9][10][11]. The association of abortions in sheep herds in Brazil to the presence of C. abortus was not confirmed, and it was found to be involved with other reproductive disorders, including the birth of dead pups [8,19]. This fact demonstrates that the agent can be a major cause of the birth of dead pups in the region.…”

Section: Resultsmentioning

confidence: 99%

Epidemiological Evaluation of Reproductive Infectious Agents in Sheep in the Brazilian Semiarid

Azevedo¹

2013

World j. vet. sci.

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The aim of this work was to identify sheep herds with history of reproductive failures (abortions and perinatal mortality) associated to presence of Chamydophila abortus, Brucella ovis and Leptospira spp. infections in the semiarid region of Northeastern Brazil. Blood samples were collected from 476 animals from 72 herds in 14 counties of the Sertão mesoregion, state of Paraíba. For the serological diagnosis of C. abortus, B. ovis and Leptospira spp. infections, complement fixation test (CFT), agar gel immunodiffusion test (AGID) and microscopic agglutination test (MAT) were used, respectively. Herd-level prevalence (herds with at least one seropositive animal) of C. abortus was 52.8%, followed by B. ovis (33.3%) and Leptospira spp. (27.7%); concerning seropositivity in animals there was also a higher frequency of C. abortus (19.7%), followed by B. ovis (12.1%) and Leptospira spp. (7.6%) (p < 0.05). Herds with history of abortion (31.9%; 23/72) and perinatal mortality (54.2%; 39/72) had at least one sheep seropositive to one of the infectious agentes. For abortions, herd-level prevalence of C. abortus was 60.8%, followed by B. ovis (43.4%) and Leptospira spp. (30.4%). For perinatal mortality, herd-level prevalence was 64.1% for C. abortus, 38.4% for B. ovis and 33.3% for Leptospira spp. It is suggested that these agents may be important causes of reproductive failures in the semiarid region, and, thus, it is recommended that herd owners should be informed on reasonable sanitary measures related to animal health, and advised to perform diagnosis in cases of abortion and perinatal mortality.

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Section: Resultsmentioning

confidence: 99%

Epidemiological Evaluation of Reproductive Infectious Agents in Sheep in the Brazilian Semiarid

Azevedo¹

2013

World j. vet. sci.

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Seroprevalence and risk factors associated with Chlamydophila spp. infection in ewes in the northeast of Algeria

Hireche

Bouaziz

Djenna

et al. 2013

Trop Anim Health Prod

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A cross-sectional study was carried out to estimate prevalence of Chlamydophila spp. antibodies and to investigate risk factors associated with chlamydial infection in 552 ewes between March 2011 and January 2012 in the province of Constantine. Anti-Chlamydophila antibodies were detected using an indirect enzyme-linked immunosorbent assay kit in 24.5% of examined sera. Of the herds, 70.4% had at least one seropositive animal. A pretested structured questionnaire was administered in order to collect information on individual animal health and herd management practices. Chi-square analysis and multivariable logistic regression model were used to identify risk factors related to Chlamydophila seropositivity. Univariable analysis revealed 17 variables with p < 0.25 that were offered to the multivariable logistic regression model which in turn identified 12-23 months age group (OR = 5.903, 95% CI (OR) = 1.690; 20.618) and not using disinfectants (OR = 2.099, 95% CI (OR) = 1.314; 8.065) as risk factors for Chlamydophila spp. seropositivity. Moreover, occurrence of stillbirth problem (OR = 3.682, 95% CI (OR) = 1.825; 7.430) and 5-10% mortality rate in young lambs (OR = 2.584, 95% CI (OR) = 1.058; 6.310) were significantly associated with seropositivity to Chlamydophila spp. On the other hand, availability of veterinary service was identified as a protective factor (OR = 0.161, 95% CI (OR) = 0.051; 0.511).

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Seroprevalence and molecular characterization of Chlamydia abortus in frozen fetal and placental tissues of aborting ewes in northeastern Algeria

Hireche

Ababneh

Bouaziz

et al. 2015

Trop Anim Health Prod

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Enzootic abortion of ewes is one of the most serious health problems in sheep flocks worldwide. It has a significant economic impact because abortion, decrease in milk production and weak lambs. Besides, the bacteria is zoonotic. A cross-sectional study was conducted to determine the seroprevalence and risk factors associated with Chlamydia abortus infection in 552 ewes in Constantine using a C. abortus-specific indirect ELISA kit. Chlamydial DNA was investigated in ten ovine fetuses and eight placentas using PCR- restriction fragment length polymorphism (RFLP) and DNA sequencing. The study concluded that 7.2 % of ewes were seropositive and 33.3 % of sheep flocks had at least one seropositive ewe. Adjacent farmworker visits (OR = 7.667, 95 % CI (OR) = 2.307; 27.203) was defined as a risk factor. Deliveries of weak lambs (OR = 2.920, 95 % CI (OR) = 1.022; 8.342) and septicemia in lambs (OR = 9.971, 95 % CI (OR) = 2.383; 41.713) were significantly associated with chlamydial infection. PCR-RFLP analysis revealed positive signals to C. abortus in six fetuses and four placentas. Sequencing of the omp2 gene revealed that the Algerian strain is 96 % similar with C. abortus FAS strain. C. abortus plays a major role in abortion in northeastern Algeria. Appropriate control measures must be implemented to reduce economic losses and to avoid human contamination.

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Seroprevalence of antibodies to Chlamydophila abortus in ovine in the State of Alagoas, Brazil

Cited by 15 publications

References 7 publications

Epidemiological Evaluation of Reproductive Infectious Agents in Sheep in the Brazilian Semiarid

Epidemiological Evaluation of Reproductive Infectious Agents in Sheep in the Brazilian Semiarid

Seroprevalence and risk factors associated with Chlamydophila spp. infection in ewes in the northeast of Algeria

Seroprevalence and molecular characterization of Chlamydia abortus in frozen fetal and placental tissues of aborting ewes in northeastern Algeria

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