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. 2010 May 18;4(5):e690. doi: 10.1371/journal.pntd.0000690

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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The city of Cali is located in south-western Colombia (see inset). Cali is divided into 22 (numbered in the figure) distinct geographic districts called “comunas”. These are clustered within 5 administrative regions called Empresas Socials del Estado “ESEs”: Ladera (yellow), North (blue), Center (pink), South-East (purple) and East (green). Public health hospitals are strategically distributed within the “ESEs”. The syphilis patient recruitment network was comprised of 13 hospitals and health centers located throughout the city.