How Ebola Spreads: Transmission Routes Explained
A science-based explanation of how Ebola virus disease is transmitted between people, including common misconceptions, risk factors, and what does NOT spread the virus.
The Basics of Ebola Transmission
Ebola is not airborne. Unlike influenza or COVID-19, Ebola does not spread through the air under normal circumstances. This fundamental fact explains why Ebola outbreaks, despite extreme deadliness, are geographically limited and containable.
Ebola spreads through direct contact with:
- Blood
- Vomit
- Faeces
- Sweat
- Urine
- Semen
- Breast milk
…of a symptomatic or deceased person (or animal) infected with the virus.
The Requirement: Broken Skin or Mucous Membranes
The virus must enter the body through a portal of entry:
- Broken or damaged skin
- Eyes, nose, or mouth (mucous membranes)
- Needlestick injuries (healthcare workers)
Intact, unbroken skin provides a complete barrier to infection. This is why PPE — particularly gloves and face protection — is so effective.
Who Is at Highest Risk?
- Family caregivers providing home care to a symptomatic patient (direct contact with body fluids)
- Healthcare workers without adequate PPE
- Mortuary workers and mourners at traditional burial ceremonies (corpses remain highly infectious)
- Laboratory personnel handling specimens
The Funeral Transmission Problem
Traditional burial practices that involve washing, touching, and mourning over the body of a deceased person have been a major driver of Ebola outbreaks — particularly in West Africa’s 2014–2016 epidemic. Up to 20% of cases in some outbreaks were linked to funeral exposure.
Safe and Dignified Burial (SDB) teams — trained by WHO and MSF — are one of the most effective outbreak control interventions.
What Does NOT Transmit Ebola
- Casual contact: shaking hands with a healthy person, sitting next to them
- Air: Ebola does not spread through breathing, coughing, or sneezing (except rare aerosol procedures in healthcare settings)
- Water or food: standard food and water do not transmit EVD
- Mosquitoes or insects: Ebola is not vector-borne
Sexual Transmission
Ebola RNA has been detected in semen for up to 500+ days after clinical recovery in some male survivors. Sexual transmission from recovered males to partners has been documented. WHO recommends using condoms or abstaining from sex for at least 12 months after recovery, or until two semen tests are negative.
The Incubation Period Rule
A person in the incubation period (2–21 days) is NOT contagious. Contagiousness begins only when symptoms appear. This is the scientific basis for the contact tracing and monitoring approach used in outbreak control.
Summary
| Route | Risk |
|---|---|
| Direct contact with body fluids of symptomatic patient | High |
| Traditional burial without PPE | Very High |
| Needlestick injury (healthcare) | High |
| Sexual contact (recovery period) | Moderate |
| Casual contact with healthy person | None |
| Air/water/food/insects | None |