The new standard of starting treatment at a CD4 count of 350 has already been embraced by the World Health Organization and the United Nations' UNAIDS program.

VOA: standard.2010.07.21

For example, HIV enters cells of the immune system by binding to a receptor called CD4.

比如,HIV通过与CD4的受体结合,进入到免疫系统细胞中

耶鲁公开课 - 生物医学工程探索课程节选

Beginning treatment when CD4 drops to 200 works well, but a team of Haitian and American doctors at the GHESKIO clinic in Port-au-Prince wanted to see if they could do better.

VOA: standard.2010.07.21

In the new study, they randomly assigned patients to get AIDS medicines when their CD4 count hit 200, the standard procedure, or to get the antiretrovirals earlier, when their CD4 had only dropped to 350.

VOA: standard.2010.07.21