02255naa a2200277 a 450000100080000000500110000800800410001910000230006024500940008326000090017752015260018665000110171265000130172365000110173665000110174765000220175865300130178065300110179365300130180465300130181765300110183070000210184170000160186270000210187877300780189918106472003-05-29       1997    bl ---       0--  u    #d1 aSILVA, R. A. M. S.  aAbortions caused by Trypanosoma vivax in bovines from the Pantanal of Pocone, MT, Brazil.  c1997  aTrypanosoma vivax infected non-preganant heifers and heifers in the third trimester of preganancy developed a more severe form of the disease than preganant heifers in the first and second trimesters of preganancy. Calves born of infected heifers had enlarged spleens and lymph nodes and trypanosomes are present intheir blood, providing evidence of transplacental transmission (Ogwu et al. 1986 Theriogenology 25:383-398). In the begining of 1995, several outbreaks of fever, anemia, progressive weakness, loss of condition, loss of appetite, lethargy, substantial weight loss within a relative short period of time, anemia and progressive emanciation, abortion and death of bovines occurred in the Panatanal of Pocone. ten of the twenty-nine (34.48%) bovines (Bos taurus taurus x Bos taurus indicus) from nine cattle ranches were infected by T. vivax. All ranches presented positive animals (Silva, et al. 1996 Mem Inst Oswaldo Cruz 91:561-562). Seven of 9 ranches were investigated for records of abortions. The ranchs were designated as R1 to R7, respectively. The total number of bovines by ranch was 200, 400, 400, 250, 450, 400 and 300 in R1-R7, respectively. The percent of abortions was 8, 0, 1.5, 1.6, 1.3, 0.5 and 0.6 in R1-R7, respectively. All abortions occurred in the third trimester of preganancy. Our results are similar with those recorded by Ogwu & Njoku (loc. cit.) in Nigeria because severe clinical signs (e.g. blindness) were observed in cows from the Pantanal in the third trimester of preganancy.  aBrazil  aPantanal  aAborto  aBovino  aTrypanosoma Vivax  aAbortion  aBovine  aParasita  aParasite  aPocone1 aDAVILA, A. M. R.1 aRAMIREZ, L.1 aPELLEGRIN, A. O.  tMemorias do Instituto Oswaldo Cruzgv.92, p.123, Nov. 1997. Supplement 1.