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RODRIGUES, A. M. A. Canine leptospirosis: e etiological, serological and molecular diagnosis and evaluation of cross-protection between sevorars icterohaemorrhagiae and copenhageni. [Leptospirose canina: diagnóstico etiológico, sorológico e molecular e avaliação da proteção cruzada entre os sorovares icterohaemorrhagiae e copenhageni.]. 2008. 116 f. Dissertação (Mestrado em Medicina Veterinária) Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, 2008. A research on agglutinating antibodies (AAc) anti-leptospira has been performed, through microscopic agglutination test (MAT) and attempts of isolation of the etiologic agent in 29 dogs with clinical suspicious of leptospirosis. There was also made a research of Leptospira spp. ́s genetic material, using polimerase chain reaction (PCR) in 24 urine samples of the same dogs. With the aim to determine the cross protection between serovars icterohaemorrhagiae and copenhageni, 24 adult dogs were evaluated before and after vaccination with one dose of a vaccine containing icterohaemorrhagiae, canicola, grippotyphosa and pomona antigens, by the in vitro inhibition growth test (GIT) of serovars canicola, icterohaemorrhagiae and copenhageni. The AAc anti-copenhageni titers were the most frequently obseeved in the dogs with clinical suspicious of leptospirosis, existing however, cross reaction among different serovars. There were isolated four samplas of leptospira, of witch three were all characterizated by polyclonal antibodies and Variable Nunber Tandem Repeat (VNTR) as serovar canicola. The fourth isolated sample reacted in high titers to polyclonal antisera anti-copenhageno (51.200), but is was not tested with antisera anti-icterohaemorrhagiae. By VNTR technique, this sample was classified as belonging to the serogroup icterohaemorrhagiae, and finally by the use of monoclonal antibodies F70 C24, F70 C14-10, F12 C3-11 and F89 C12, for differentiation of the representatives of serogroup icterohaemorrhagiae. This isolated sample presented the immunological behavior of serovar copenhageni (standard strain LI 130, FIOCRUZ – Bahia). Considering the sorologic criteria confirmation of clinical diagnosis of leptospirosis, titers higher or equal than 800 in a unique serum sample, or the increase or decrease of four times of AAc titers (two dilutions) in two paired serum samples, there was the conformation of etiologic diagnosis in 9 of the 24 dogs (37,5%) by MAT. However, 11 out of 24 urine samples (45,8%) were positive

Leptospirose canina: diagnóstico etiológico, sorológico e molecular e avaliação da proteção cruzada entre os sorovares icterohaemorrhagiae e copenhageni