| maedi-visna virus infection in karayaka and amasya herik breed sheep from provinces in northern turkey. | maedi-visna is an important virus infection of sheep having prolonged incubation period (slow disease) and reflecting two distinct forms clinically and pathologically. in this study, the presence of mvv was investigated serologically in 58 amasya herik sheep breed and 525 karayaka sheep breed. seropositivity rates in amasya herik sheep breed and karayaka sheep breed were detected as 69.0% and 18.5%, respectively. mvv antibodies were found in 137 of 583 serum samples (23.5%). positivity rates for ... | 2011 | 22065306 |