Diagnosis of Leptospira spp. infection in sheep flocks in the state of Mato Grosso, Brazil

Eckstein, Camila; Lopes, Luciano Bastos; Moustacas, Valéria Spyridion; Rodrigues, Rogério Oliveira; Castro, Bruno Gomes de; Santos, Renato Lima

Background:

Leptospirosis has a worldwide distribution with high social and economic impact. It is caused by a variety of Leptospira spp. serovars, particularly in tropical regions. Various species of animals can be affected by Leptospira spp. including cattle, horses, sheep, goats and swine, and can act as a reservoir for human infection. In Brazil, sheep leptospirosis has been diagnosed in a variety of States, however, little is known about sheep flocks of Mato Grosso. Considering the marked growth of sheep industry in Mato Grosso State in past recent years, this study aimed to evaluate the frequency of serologically positive sheep for Leptospira spp. serovars in the State of Mato Grosso (Brazil). Materials, Methods &

Results:

Blood samples of 346 sheep, which belonged to 16 sheep flocks of the medium northern region of Mato Grosso was obtained by jugular vein puncture. Serum was obtained by blood centrifugation and stored at -20°C until the test to be performed. The diagnosis was performed using the microscopic agglutination test. Serovars Australis, Autumnalis, Bataviae, Bolívia, Castelonis, Celledoni, Grippotyphosa, Hardjo, Hardjobovis, Hebdomadis, Icterohaemorrhagiae, Javanica, Lagoa, Norma, Panama, Pomona, Sejroe, Shermani, Szwajizak, and Wolffi were tested. Reactions were considered positive with minimum titration of 1100. Considering all serovars, 54.9% of sheep were positive, and the serovar more frequently detected was Celledoni (22.8%), followed by Javanica (19.4%), Castellonis (16.5%), and Norma (15.3%), with predominance of titration of 100 for these serovars, while only one sheep had a titration of 1800 detected for serovar Hardjo. All flocks (100%) were positive (at least one positive animal), with the frequency of animals positive to Leptospira spp. varying of 31.3% to 79.2% in flocks.[...](AU)

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