The effectiveness of immunization is easy to see. Take for example hepatitis B, which is widespread among Taiwanese. The DOH began immunizing for hepatitis B in 1985. Over the past decade or so, the "carrier rate" has dropped significantly.
疫苗的防治效果是顯而易見的，以國人盛行的 B 型肝炎為例，衛生署從民國七十四年起實施 B 型肝炎預防注射，十幾年來，B 型肝炎的帶原率已有顯著下降。