First Few X Cases and Contacts (FFX) Investigation Protocol for Coronavirus Disease 2019 (COVID-19) [open pdf - 2MB]
From the Document: "Several early epidemiological investigation protocols are available for countries. [...] 'The First Few X cases and contacts (FFX) investigation protocol for coronavirus disease 2019 (COVID-19).' This is about dentification and tracing of cases and their close contacts in the general population, or restricted to close settings (like households, health-care settings, schools). FFX is the primary investigation protocol to be initiated upon identification of the initial laboratory-confirmed cases of COVID-19 in a country. [...] This document sets out the methods to guide data collection and the public health investigation for the comprehensive assessment of confirmed COVID-19 cases and their close contacts."
2020 World Health Organization. Posted here with permission. Document is under a Creative Commons license and requires proper attribution and noncommercial use to be shared: [https://creativecommons.org/licenses/by-nc-sa/3.0/igo/]
World Health Organization: https://www.who.int/