Method Immunization effect of 514 children after they had BCG inoculated for 3 months was examined using the PPD tests.

 
  • 方法應用結核菌素純蛋白衍生物(PPD)試驗,對514名兒童進(jìn)行卡介苗接種3個(gè)月后陽(yáng)性率調查。
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