EXPLAINER: Why Ebola contact tracing runs for 21 days
This explainer details why health authorities mandate a 21-day monitoring period for individuals exposed to the Ebola virus. The duration is based on the virus's maximum incubation period, ensuring that contacts are symptom-free before being cleared.
Why it matters
Understanding the science behind contact tracing is essential for public health compliance and effective disease containment during outbreaks.
Ebola virus./FILE When an Ebola outbreak is detected, health authorities race to identify people who may have been exposed to the virus before they develop symptoms.
While infected patients are isolated and treated, epidemiologists and community health workers trace their movements and identify people who may have come into contact with them.
According to operational guidelines issued by the World Health Organisation (WHO) Regional Office for Africa in September 2014, contact tracing is one of the key measures used to break chains of Ebola transmission.
Contact tracing involves identifying, listing and monitoring people who may have come into physical contact with an Ebola patient, whether alive or dead, or with their bodily fluids.
Because Ebola is spread through direct contact, identifying people who may have been exposed allows health authorities to monitor them and act quickly if they develop symptoms.
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