Table 4.

Pilot data about viremic patterns of type II porcine reproductive and respiratory syndrome virus (PRRSV) according to the MLV vaccinating schedule in Korea, 2007

^*MLV vaccinating schedules: Sow (MLV vaccination on the sow group only, usually at nursery or mass vaccination with 3 months of interval), Sow/piglet (MLV vaccination on sows and piglets at 2~4 weeks of age). ^†S/P ratio (mean ± SE): S/P ratio obtained from commercial ELISA kit, S/P ratio of ≥ 0.4 regarded as sero-positive to PRRSV. ^‡No. of farms with viremic pigs / No. of tested farms.