Multiplo Tp/HIV Self-Test

This is a cross-sectional study that employs both observational and interview-based methods. All participants will read the instructions for use (IFU) and conduct the Multiplo TP/HIV Self-Test. They will not be provided any training prior to use. A trained Observer will observe and document the use of the test and independently read the lay user self-test result. 400 participants will also be provided with ten (10) mock devices with different results and asked to interpret those results (i.e. strong positive, weak positive, negative, invalid with no control line and no test dots, and invalid with no control line and positive test dots). The participants will then complete a questionnaire to share their opinions on usability and label comprehension of this test. All participants will also have a venous blood sample collected for testing of serum at a central laboratory with a 4th generation HIV EIA and standard syphilis serology that will serve as the Comparator Methods (CM). All self-tests will be confirmed using laboratory-standard HIV and syphilis testing algorithms. The sensitivity and specificity of the self-test results will be calculated relative to the "clinical truth" of the participants' HIV and syphilis status determined by the comparator methods. All enrolled Participants will voluntarily provide medical history and the specimens according to Section 4, Study Procedures at Visit 1 (Day 1), for the testing with the Multiplo TP/HIV Self-Test. Persons with reactive syphilis self-tests may be counselled for immediate treatment. All Participants will have a laboratory test done for performance comparison and will be instructed to return to the clinic for a follow-up visit (Visit 2), two (2) weeks later to obtain their laboratory test results. Participants may also have a separate Point-of-Care (POC) test for HIV and/or syphilis conducted on-site as part of the clinic's standard of care testing, outside of the protocol. * Subject recruitment * Registration and confirmation of eligibility (enrolment questionnaire) * Administering informed consent * Review of inclusion/exclusion criteria and enrollment * Venous blood specimen collection for laboratory testing * Participant brought to a private room with site observer * Observer instructs participant on study process (not testing procedure) * Participant given one Multiplo Tp/HIV Self-Test package * Participant performs the self-test and interprets the results * Observer then interprets the participant's self test results * Observer interviews participant with self-test questionnaire * Participant given the option of participating in the Mock Result Interpretation exercise * Participant returns to the site for the laboratory results in approximately 2 weeks MOCK RESULTS INTERPRETATION A minimum of 400 participants across all study sites will complete device interpretation of contrived (mock) results from prepared devices. Devices will include contrived reactive, weakly reactive, negative, and 2 types of invalid results with their reactivity blinded to the participant.