| onchocerca cervicalis in horses from southern brazil. | the objective of this study was to determine the occurrence of onchocerca cervicalis in 1200 adult horses from rural areas of rio grande do sul, brazil. umbilical skin specimens measuring 2 x 2 cm were minced, suspended in 10 ml of distilled water and incubated at room temperature overnight. the liquid volume was centrifuged and the sediment was screened for microfilariae. the ligamentum nuchae were totally removed, preserved in ice and dissected for the detection of adult forms of onchocerca ce ... | 2004 | 15563023 |