Assess the Performance of Metagenomic Sequencing in the Diagnosis of STI (NGS-IST)

"Proposal of the study to all eligible adult patients coming for pre-exposure prophylaxis (PrEP) consultations from the Infectious Diseases Department of Saint-Antoine and Tenon Hospitals (with delivery of a patient's information and signing an informed consent form).~During each visit (D0, M3, M6, M9, M12 and intermediate visits), patients will be asked to:~* Respond to a questionnaire on their history of taking antibiotics, STIs, their foreign travels, their consumption of tobacco, drugs, alcohol and their sexual practices.~* Perform the following additional samples at each visit, including the intermediate: rectal and throat swabs, urine sample and swab from the lesions in the case of ulceration presence due to STIs.~The diagnosis of STIs (NG and MG) will be carried out using 2 techniques: the reference technique and the Next-Generation-Sequencing (NGS) technique.~A serum sample will be collected during routine care. All samples will be stored after the analysis under -80° C."