Estudo da paratuberculose em búfalos (Bubalus bubalis) no estado do Maranhão

Abstract

This study investigated paratuberculosis (PTB) in water buffaloes in the state of Maranhão (MA). For that were performed using the rectal biopsy as an auxiliary tool in the collection of samples for ante mortem diagnosis of PTB; dosages of copper (Cu), zinc (Zn) and iron (Fe) in PTB positive animals was performed, as well as the report of the detection of Mycobacterium avium subsp. paratuberculosis (Map) in the utero and fetus of a buffalo. In the first study were conducted 140 rectal biopsies in buffaloes of Murrah, Mediterranean and their crossbreeds, over the age of three years in São Mateus, MA. These biopsies were processed by Ziehl-Neelsen (ZN) staining and quantitative PCR (qPCR). Postmortem examination of 11 buffaloes with clinical signs suggestive of PTB was performed and samples of ileum and mesenteric lymph nodes (MLN) were collected for performing qPCR and ZN. By ZN staining of rectal biopsies, 4.3% (6/140) acid-fast bacilli and qPCR, 5% (7/140) had amplification of genetic material. The pathological lesions of four animals were consistent with lesions suggestive of PTB showed acid-fast bacilli and amplification of genetic material. The correlation between rectal biopsy and analysis of ileal tissue and LM, according to the Kappa test was high (K=0.792). In the second study, 13 postmortem examination were carried in buffaloes of Murrah, Mediterranean and their crossbreeds, over the age of three years in the cities of São Mateus and São Luís, MA. Ileum and mesenteric lymph nodes samples were collected for Map search and liver to dosage minerals (Cu, Zn and Fe). Seven buffaloes were positive for PTB and allocated in Group 1; six buffaloes were negative and allocated in Group 2. In the dosing of trace minerals in Group 1 showed levels below the reference values for Cu and Zn. It was observed that the average Cu concentration was 18.0ppm and Zn 68.6ppm. In Group 2 the average Cu concentration was 113.7ppm and Zn 110.0ppm. The iron concentrations in both groups were high (>669ppm). The third study was conducted on a property in São Luís, MA. A buffalo cow pregnant with marked physical debility and clinical signs suggestive of PTB was eutanasiada and necropsiada. Fragments ileum, MLN, uterus, and placenta of buffalo cow were collected; fragments of kidney, liver, umbilical vessel and digestive system (DS) of the fetus were collected and were analyzed by Zn and qPCR. The buffalo cow was positive in ileum samples, mesenteric lymph nodes and uterus in qPCR and the fetus was positive in DS. In the ileum, MLN and feces were observed acid-fast bacilli. It is concluded that rectal biopsy analysis can be used to help diagnose ante mortem. The PTB could lead to mineral deficiency and worsen the clinical condition of the buffaloes. The presence of Map in buffalo can occur in various organs, including the reproductive system and intrauterine transmission can occur in this species.