Data is representative. Although data is for all ANC sentinel sites, the sites themselves are mostly urban and large areas of South Central Somalia remain inaccessible and thus not possibly includable in a sentinel survey. All the 57 women who were syphilis positive on testing at the facilities  were treated. However, due to supplies disruption syphilis test kits during the data collection, and some errors by field staff, another 65 samples were only diagnosed later. This was either later testing when kits became available or on repeat quality control testing at a reference lab in Kenya 9 months after completion of the sentinel survey data and sample collection. Thus the opportunity to treat these too had been missed. SOURCE: Sentinel surveillance