Table 1. Sampling scheme used to detect PRV Seroprevalence in swine herds of Shandong, 2012–2014.

^*Classified by the number of multiparous sows. ^†10-week-old to 20-week-old growing pigs. ^‡Bodyweights ranged from 50 kg to 110 kg. ^§1 to 6 parities and at least 3 with parity = 1.