| ovine lentiviral infection (maedi/visna) in morocco: a serologic and postmortem survey. | in an attempt to estimate the importance of maedi/visna virus infection in moroccan sheep and to assess the relationship, if any, between seroreactivity and pulmonary lesions, an abattoir-based serologic survey was undertaken over a period of 2 years. a total of 1000 blood samples and related lungs were collected from sheep of different breeds and ages slaughtered at three major municipal abattoirs in morocco (casablanca, kénitra and rabat). the agar gel immunodiffusion test showed that the sero ... | 1994 | 7975974 |