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Table 1 Inclusion and exclusion criteria for the PICASSO 2 study, Lima, Peru, 2018–2022

From: Investigation of syphilis immunology and Treponema pallidum subsp. pallidum biology to improve clinical management and design a broadly protective vaccine: study protocol

Inclusion CriteriaExclusion Criteria
Age ≥ 18 years oldUnable to give informed consent
Newly diagnosed with syphilis infectionUnlikely to complete study follow up
• Group 1 (n = 100): No history of syphilis and documented negative Treponema pallidum antibody test in past 12 months 
• Group 2 (n = 100): History of syphilis (documented positive Treponema pallidum antibody test) and history of syphilis treatment 
Intention to stay in Lima or its environs for the next 12 months 
Willingness to provide fingerstick and venipuncture whole blood specimens