纽约的 Presbytevian 医院曾经在八年中,把每一个术后发生感染的伤口的分泌物,作了细菌学的检查(这些手术都是在进入手术室的人都戴有口罩的情况下作的),检查的结果如下表: For eight years, the Presbytevian Hospital in New York City has conducted a bacteriological examination of the secretions of every post-operative wound infection (all of which were done when masks were inserted into the operating room) , Check the results in the following table: