Leeming J P, Pryce-Roberts D M, Kendrick A H, Smith E C
Bristol Public Health Laboratory, Bristol Royal Infirmary, UK.
J Hosp Infect. 1995 Nov;31(3):205-10. doi: 10.1016/0195-6701(95)90067-5.
The ability of two low resistance barrier filters (Collins DC-1 and Pall Pf 305) to remove bacteria from expired air was assessed. A specially designed coupling device was used to hold each filter or a disposable plain cardboard mouthpiece a fixed distance (4.5 cm) from a blood agar plate. Volunteers performed maximal forced vital capacity manoeuvres through the assembled apparatus and bacteria impinged on to the agar plate were enumerated. Both filters allowed the transmission of approximately one-third of expired colony forming units. The efficacy of these filters for reducing the likelihood of cross-infection during spirometry is not supported by this study.
评估了两种低阻力屏障过滤器（柯林斯DC - 1和颇尔Pf 305）从呼出气体中去除细菌的能力。使用一种专门设计的耦合装置，将每个过滤器或一个一次性普通硬纸板咬嘴固定在距血琼脂平板4.5厘米的固定距离处。志愿者通过组装好的装置进行最大用力肺活量动作，并对撞击到琼脂平板上的细菌进行计数。两种过滤器都允许大约三分之一的呼出菌落形成单位透过。这项研究不支持这些过滤器在肺活量测定期间降低交叉感染可能性的功效。
