Why are contacts of Ebola patients monitored for 21 days?

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Ebolavirus and Ebola virus disease — Ebola Numerous filamentous ebolavirus particles (blue) budding from a chronically-infected VERO E6 cell (yellow-green) in this digitally colorized scanning electron micrograph produced by the U.S. National Institute of Allergy and Infectious Diseases (NIAID).

Contacts of Ebola patients are monitored for 21 days because the incubation period for the virus ranges from 2 to 21 days.1

Monitoring exposed individuals for this duration is a critical component of disease surveillance and containment efforts. By tracking contacts throughout this window, health officials can identify new infections as soon as symptoms appear, allowing for prompt isolation and medical care to prevent further transmission of the disease.23