HIV infected cocaine users have uncontrolled viral levels and impaired immunity to control infection compared to HIV infected non-drug users. We ask the questions why cocaine use makes HIV infected cocaine users more sick than other patients. The goal is to improve immunity to control HIV infection in cocaine users. Both uninfected cocaine users and HIV-infected cocaine users are especially needed in this study.

The primary objective of this study is to evaluate the safety and the Clostridioides difficile infection (CDI) recurrence rate in participants who receive a 14-day course of VE303 or matching placebo.
Other objective is to measure health-related quality of life and daily CDI symptoms in participants treated with VE303 versus placebo.