| seroprevalence survey for salmonella abortusovis infection in swiss sheep flocks. | between 1976 and 2003, no infections with salmonella abortusovis had been officially recorded in switzerland. since then, however, several sheep flocks were infected and suffered massive fetal losses suggesting a re-emergence of the disease. therefore, the aim of this study was to assess the epidemiological situation of s. abortusovis infection in sheep in this country. a representative serum sample collected in 2007 in the context of certifying brucella freedom included sera from 578 flocks wit ... | 2010 | 20870306 |