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化学疗法和疫苗开始应用以来的几年,许多传染病的死亡率显著下降。如一九四四年来百日咳和小儿麻痹的死亡率下降几乎100%,结核和细菌性痢疾死亡率也下降近乎100%。但是一旦患化脓性脑膜炎若不给予治疗则死亡的可能性很大,这种情况直到抗菌药物引用后的数年内,死亡率才有明显下降。然而过去15年来脑膜炎的死亡率并没有明显改变。虽然细菌
In the years since chemotherapy and vaccines began, the mortality rate for many infectious diseases dropped significantly. For example, the mortality rate of whooping cough and poliomyelitis dropped almost 100% in 1944 and the mortality rate of tuberculosis and bacillary dysentery dropped by almost 100%. However, once suffering from purulent meningitis, the possibility of death without treatment is very high. In this case, the mortality rate will not be significantly reduced within a few years after the reference of antimicrobial agents. However, the meningitis mortality rate has not changed significantly over the past 15 years. Although bacteria