Discussion . Prior to the present WHO-led ProSPeRo study, there have been a limited number of published studies on the comparative performance of the GeneXpert system for STI testing, especially for TV: with one field-based study (TTANGO; Test, Treat ANd GO) and several laboratory-based studies having been conducted in Australia and the USA [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. In the Australian studies, a laboratory evaluation involving 372 characterised CT or NG bacteri...