Observations on Single Brucellosis Reactors in Large Herds

Trueman, K. F.; Thomas, A.D.; Spinks, G. A.

doi:10.1111/j.1751-0813.1979.tb15270.x

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Such a high prevalence in feral pigs is important for 2 reasons. Firstly, infected feral pigs are a likely source of B. suis infection for cattle, which adversely affects the status of herds undergoing B. abortus eradication programs (Trueman et al 1979;Cook and Noble 1984). Secondly, spillover of B. suis from feral to domestic pigs occurs, when they are raised extensively in areas where feral pigs are plentiful or when feral pigs are introduced into domestic herds.…”

Section: Introductionmentioning

confidence: 99%

An evaluation of three serological tests for antibody to Brucella suis in pigs

Rogers¹,

Cook²,

Ketterer³

et al. 1989

Aust Veterinary J

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The Rose Bengal Plate Agglutination test (RBT), the complement fixation text (CFT) and the tube agglutination test (TAT) were applied to serums from 345 feral and 80 domestic pigs sampled at slaughter. At least 2 of the 3 serological tests were applied to each serum. Tissues from all pigs were cultured for Brucella suis and the degree of culture effort was categorised from 1 to 4 in decreasing order. Fifty-eight feral and 35 domestic pigs were culture-positive. A greater proportion of culture-positive pigs was obtained for category 1 and 2 culture effort. Tissues yielding B. suis most often were mandibular, gastrohepatic and external iliac lymph nodes, spleen and various abdominal organs. Infection in domestic pigs was associated with exposure to feral pigs. The sensitivity (Se) in culture-positive pigs of the RBT (79.1%) was significantly greater than that of either the CFT (49.1%) or TAT (51.1%). The specificities (Sp) in culture-negative pigs were 81.2% for the RBT, 90.8% for the CFT and 81.0% for the TAT. A more realistic estimate of Sp for the RBT was considered to be 97.6%, based on serological results from 31,326 domestic pigs routinely tested for regulatory purposes. The RBT was clearly superior to the other 2 tests in this study. However, a more sensitive screening test would be preferable for use in a test and slaughter eradication program. The RBT would be a suitable confirmatory test.

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Section: Introductionmentioning

confidence: 99%

An evaluation of three serological tests for antibody to Brucella suis in pigs

Rogers¹,

Cook²,

Ketterer³

et al. 1989

Aust Veterinary J

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Brucella Suis Infection in Pregnant Cattle

Norton

Thomas

1979

Aust Veterinary J

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Six pregnant, Bos taurus cows with stages of gestation ranging from 11 to 33 weeks were each inoculated into the right conjunctival sac with 0.2 ml of a smooth culture of Brucella suis type I containing 27 x 10(6) viable organisms. The 6 cows produced 7 calves of which one single calf and one twin calf were stillborn, the cause of which was not determined. Br. suis was not isolated from any of the cows or calves using either special media or guinea pig inoculation. No abnormality was found in any of the cows or calves at autopsy. Microscopic examination of placentas and tissues from stillborn calves revealed no abnormality. Serologically, 2 weeks after inoculation all 6 cows had positive reactions to the Rose Bengal Test (RBT) and serum agglutination (SAT) titres of 25 iu to 116 iu. However, these reactions disappeared within 11 weeks. Only 2 cows had a complement fixation (CFT) titre which lasted a maximum of 5 weeks and reached a titre of 4/4. Following the anamnestic use of Br. abortus strain 45/20 vaccine on 3 of the cows, positive RBT reactions, SAT titres of 33 iu, 29 iu and 58 iu and CFT titres of 4/16, 1/8 and 3/8 respectively were recorded 6 weeks after vaccination.

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A study of cattle infected with Brucella abortus and which showed aberrant serological reactions

1982

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Sixty cows, 48 of which had been vaccinated with live Brucella abortus strain 19 (S19) or with killed B. abortus strain 45/20 (S45/20) and 12 of which were unvaccinated animals, were challenged with B. abortus strain 544. Ten of the 27 cattle found to be infected after challenge showed aberrant serological reactions to the Rose Bengal Plate test, serum agglutination test and/or complement fixation test. These 10 cattle were all previously vaccinated with S19 or S45/20. It was concluded that infection in cattle vaccinated with S19 or S45/20 may be more difficult to detect than infection in animals that have no history of vaccination.

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Observations on Single Brucellosis Reactors in Large Herds

Cited by 5 publications

References 7 publications

An evaluation of three serological tests for antibody to Brucella suis in pigs

An evaluation of three serological tests for antibody to Brucella suis in pigs

Brucella Suis Infection in Pregnant Cattle

A study of cattle infected with Brucella abortus and which showed aberrant serological reactions

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