| factors associated with seroprevalence to mycobacterium paratuberculosis in small-ruminant farms in the madrid region (spain). | a cross-sectional study was conducted in a population of small ruminants in the madrid region (spain) to determine the mycobacterium paratuberculosis seroprevalence and to identify farm factors possibly associated with paratuberculosis (ptb). farming-management information and sera were collected from 60 sheep or goat flocks. the relationship between seropositivity and the variables in the questionnaire was assessed by unconditional logistic regression, followed by random-effects logistic regres ... | 1998 | 9618744 |