Tenofovir diphosphate in dried blood spots and HIV-1 resistance in South Africa.

"Declarations Ethics approval and consent to participateWritten informed consent was given by all study participants, for data collection during study participation and data abstraction from medical charts. The ADD ART study received approval from the University of Cape Town Health Sciences Human Research Ethics Committee in 2016 (reference 166/2016) and from the New York State Psychiatric Institute: Institutional Review Board. City of Cape Town and Provincial Research Committee approvals were granted to recruit from the abovementioned clinics. This study received Ethics approval from the University of Cape Town Health Sciences Human Research Ethics Committee. (Reference 147/2023). Consent for publicationNot applicable. Competing interestsPLA has received consulting fees from Gilead Merck and ViiV and research funding from Gilead paid to his institution. Competing interests PLA has received consulting fees from Gilead Merck and ViiV and research funding from Gilead paid to his institution."

"Funding This work was supported by the National Institutes of Health [R01-AI122300]."