Porcine Circovirus - Prevalence

PCV2 is considered to be a ubiquitous virus (found everywhere)¹
Pigs can be infected with PCV2 and not show signs of clinical disease
Iowa State University states 92 percent of all U.S. pigs are vaccinated with a PCV2 vaccine.

Reference

Segalés J, Allan GM, Domingo M. Porcine circovirus diseases. Anim Health Res Rev 2005;6(2):119-42.
Gillespie T. Post-weaning multisystemic wasting syndrome and porcine circovirus type 2—Survey of U.S. swine practitioners. Proceedings of the AASV Annual Meeting;
2006 Mar 4-7; Kansas City, MO. Perry (IA): AASV; 2006. p. 231-4.
Arsenault C, Friendship R. [title unknown]. Paper presented at: Ontario Association of Swine Veterinarians; 2005 Nov; Stratford, ON.