Coronavirus disease (COVID-19) technical guidance by WHO Household transmission investigation protocol | Page 6

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Surface sampling of COVID-19 virus: a practical “how to” protocol for health-care and public
health professionals (3).
The scope and focus of this document and the first two listed above are compared in Appendix B.
All WHO protocols for COVID-19 are available on the WHO website (4), together with technical
guidance documents (5), including surveillance and case definitions (6); patient management (7);
laboratory guidance (8); infection prevention and control (9); risk communication and community
engagement (10); travel advice (11); and more (12, 13).
Comments for the user’s consideration are provided in purple text throughout the document, as the
user may need to modify methods slightly because of the local context in which this study will be
carried out.
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