| spatial distribution of bluetongue surveillance and cases in switzerland. | swiss bluetongue surveillance from mid 2007 to mid 2008 was a combination of monthly bulk milk testing of 200 cattle herds in zones of higher risk for vector presence and intensification of passive clinical surveillance. the spatial scan statistic and moran's i statistic were used to determine clustering of surveillance data. the results show a high level of surveillance intensity for bt in switzerland in 2007. in the region encompassing the cantons of aargau, basel-landschaft, basel-stadt and s ... | 2008 | 18979419 |