Mean number of different farms traders have contact with. Mean number of different holdings traders have contact with by off-farm movements for live trade (degree) in the Netherlands over the period from July 2001 to December 2004. The arrow represents the month in which movement restriction regulations were eased from 30 to 21 days.
Brouwer et al. BMC Veterinary Research 2012 8:188 doi:10.1186/1746-6148-8-188