> For the complete documentation index, see [llms.txt](https://contacttracingplaybook.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://contacttracingplaybook.org/what/asymptomatic-cases.md).

# Asymptomatic cases

[As many as 43% of COVID-19 cases may be asymptomatic](https://www.medrxiv.org/content/10.1101/2020.04.17.20053157v1). The protocol outlined above neither identify nor tests asymptomatic contacts. While all contacts are subject to a 14-day quarantine, untested asymptomatic cases will “slip through the cracks”, making it critical that contact tracing be implemented aggressively in response to *every* known and diagnosed case of COVID-19--regardless of whether the diagnosed case is experiencing symptoms.

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[Contact tracing programs](/existing-solutions.md)
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