Location data
The locations of all Swedish beef herds, including the
herds where the blood samples were collected, were specified
by three-digit postal codes. Postal codes were
retrieved from the database of the organization responsible
for the BVD surveillance program, i.e. the Swedish
Dairy Association (year 2007). Applicable postal codes
were available for 2,757 samples from 2,131 beef herds in
the study population.