豬環狀病毒感染症為一重要新豬病，主要感染4－12週齡之離乳仔豬，故亦稱為離乳後多發系統消耗綜合症 (Postweaning multisystemic wasting syndrome PMWS)，造成患豬體重銳減、呼吸困難、黃疸、間質性肺炎、與腎病為其主要特徵。到目前已利用聚合酵素鏈反應（PCR）對台灣地區88隻衰弱仔豬進行病毒之檢測，發現50隻（56%）受到PCV-2感染。本研究擬以細菌所產生並經純化之PCV-2基因蛋白如ORF2做為抗原以ELISA方法調查臺灣地區以及各年齡層PCV-2抗體的分佈情形，以了解PCV-2可能的感染期作為擬定防預措施的參考。

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