You can get Kaposi's sarcoma (KS) at any CD4 count. With that said, KS is more common at CD4 counts below 200. According to a 2014 study in the journal Cancer, the risk of KS is seven times greater at CD4 counts between 100 and 199 than at CD4 counts over 500. At CD4 counts below 50, the risk is 25 times greater.