preexposure

preexposure

1. CDC is not recommending preexposure vaccination for unexposed veterinarians, veterinary staff, or animal control officers, unless such persons are involved in field investigations.

CDC不建议对没有暴露于疾病的兽医、兽类医疗人员或动物疾病控制官员进行预接种，除非这些人进行实地研究。

2. reliability preexposure and growth testing

可靠性摸底增长试验

3. The remaining hearing loss after the exposure that does not fully recover to its preexposure level is known as permanent threshold shift (PTS).

听性脑干反应则分别在噪音暴露前、暴露后、暴露后1天、暴露后2天、或暴露后7天施行。

4. SNCV and MMCV ofulna and median nerves were prolon-ged in post-exposed groups comparedwith that in preexposure (p<0.05 ). WBC counts decreased (p<0.05 ).

铅接触组的正中及尺神经运动NCV,正中及尺神经感觉NCV,均较自身对照为慢(P<0.05)白细胞和自身对照比较差异亦有显著性。