Genetic analysis of PCV2 capsid protein sequences reveals two main groups of Estonian isolatesTimmusk, Sirje; Fossum, Caroline; Põdersoo, Diivi; Saar, TiiuWorkshop No2 Porcine Circovirus : in 15th-16th May 2007 in Croatia : Sixth Framework programme (SSA) PCVD : towards improved food quality2007 / ? p