We observed the reaction and the immune effect of anew formular for DPT vaccine with or without adsorption in field trial.

我们对新配方吸附及不吸附的百白破混合制剂进行了人群使用反应及效果观察。

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Two of the three companies making the DPT vaccine stopped distributing it, leaving only one company, Lederle (now owned by Wyeth which is now owned by Pfizer) supplying it.

FORBES: Supreme Court Saves Childhood Vaccines -- And Public Health