Schukken Y H, de Jong M C, Komijn R E, Braamskamp J, Dijkhuizen A A, Noordhuizen J P, Vernooy J C, Verheijden J H
Vakgroep Bedrijfsdiergeneeskunde en Voortplanting, Utrecht.
Tijdschr Diergeneeskd. 1992 May 1;117(9):259-64.
The diagnoses Porcine Epidemic Abortion and Respiratory Syndrome (PEARS)-positive and PEARS-negative can be made using the following data on herd performance: the average number of stillborn piglets per litter, the average number of live piglets per litter and the average piglet mortality before weaning. Depending on the number of litters used in calculating the averages, the extent to which two out of the three performance data should deviate to arrive at the diagnosis PEARS-positive is given in tables and figures. The same farm will only be diagnosed PEARS-negative if after some time at least two out of the three performance data deviate less than other criteria also provided in tables and figures.
猪流行性流产与呼吸综合征（PEARS）阳性和阴性的诊断可依据以下猪群生产性能数据做出：每窝死产仔猪的平均数量、每窝存活仔猪的平均数量以及断奶前仔猪的平均死亡率。根据用于计算平均值的产仔数，表格和图表给出了三项生产性能数据中的两项需要偏离到何种程度才能诊断为PEARS阳性。只有当同一猪场经过一段时间后，三项生产性能数据中的至少两项偏离程度小于表格和图表中也给出的其他标准时，该猪场才会被诊断为PEARS阴性。
