Methods the children who were the second grade class of primary schools were investigated the history of the BCG vaccination, BCG scar, native place and conducted PPD test.
方法对小学二年级学生进行卡介苗接种史、卡痕、户口所在地、出生地情况调查，同时进行人型- PPD试验。
Methods the children who were the second grade class of primary schools were investigated the history of the BCG vaccination, BCG scar, native place and conducted PPD test.
方法对小学二年级学生进行卡介苗接种史、卡痕、户口所在地、出生地情况调查，同时进行人型- PPD试验。
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