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| Ebola Virus |
Ebola is a rare but serious infectious disease that can cause severe illness and death.
Although Ebola is often associated with dramatic outbreaks and bleeding, not everyone with the disease develops obvious bleeding. Early symptoms can look similar to malaria, typhoid fever and several other infections, making laboratory testing and careful assessment essential.
Major advances in treatment, vaccination, laboratory diagnosis and outbreak response have changed how Ebola is managed compared with a decade ago.
This guide explains what Ebola disease is, how it spreads, common symptoms, current treatment options, vaccines and what people should do if exposure is suspected.
What Is Ebola Disease?
Ebola disease is a severe illness caused by viruses belonging to the Orthoebolavirus genus within the Filoviridae family.
Historically, the term Ebola virus disease, or EVD, was often used broadly for illnesses caused by different Ebola-related viruses.
Current terminology distinguishes between diseases caused by different viruses.
Important examples include:
Ebola virus, which causes Ebola virus disease;
Sudan virus, which causes Sudan virus disease;
Bundibugyo virus, which causes Bundibugyo virus disease; and
Taï Forest virus, which can also cause disease in humans.
Three of these viruses, Ebola virus, Sudan virus and Bundibugyo virus, have caused substantial outbreaks in Africa.
When Was Ebola First Identified?
Ebola disease was first recognised in 1976, when two outbreaks occurred almost simultaneously.
One occurred in Nzara, in what is now South Sudan, and was caused by Sudan virus.
The other occurred in Yambuku in what is now the Democratic Republic of the Congo.
The latter outbreak occurred near the Ebola River, which gave the disease its name.
How Dangerous Is Ebola?
Ebola disease can be extremely serious.
Across previous outbreaks, the average case fatality rate has been around 50%, although mortality has ranged from approximately 25% to 90% depending on the outbreak, virus, access to care and other factors.
Early diagnosis and intensive supportive treatment can significantly improve a patient's chances of survival.
What Is Happening With Ebola in Africa in 2026?
Ebola remains an important public-health threat.
In 2026, the Democratic Republic of the Congo experienced a major outbreak caused by Bundibugyo virus.
By August 2026, the outbreak had spread across several provinces and had become the largest Ebola disease outbreak ever recorded in the DRC.
This outbreak is particularly important because Bundibugyo virus is different from Ebola virus, the species against which the currently licensed Ebola vaccine and approved monoclonal antibody treatments were primarily developed.
Clinical trials are therefore underway to determine which vaccines and treatments may work against Bundibugyo virus.
This highlights an important point:
“Ebola” does not refer to one identical disease in every outbreak. The virus species involved can affect which vaccines and treatments are available.
How Does Ebola Spread?
Ebola does not normally spread through casual everyday contact in the way illnesses such as influenza do.
Human infection is believed to begin when people come into contact with infected animals or their tissues.
After the virus enters the human population, it can spread from person to person.
Transmission can occur through direct contact with the:
blood;
vomit;
diarrhoea;
saliva;
urine;
breast milk;
semen;
vaginal secretions; or
other body fluids
of a person who is sick with or has died from Ebola disease.
Transmission usually requires contact with broken skin or mucous membranes such as the eyes, nose or mouth.
Can Ebola Spread From Animals to Humans?
Yes.
Fruit bats are considered probable natural hosts of orthoebolaviruses.
Human infection has also been associated with handling infected wildlife, including:
chimpanzees;
gorillas;
monkeys;
forest antelope; and
other infected animals.
People involved in hunting, preparing or handling wildlife can therefore be at risk where the virus is circulating.
Can Someone Spread Ebola Before Symptoms Begin?
People infected with Ebola are not considered contagious before they develop symptoms.
The risk of transmission increases as illness becomes more severe because the amount of virus in body fluids can increase.
This is why rapid identification and isolation of symptomatic people is so important during an outbreak.
Can Ebola Spread Through Sex?
Yes, under certain circumstances.
Ebola virus can remain in some body fluids after a person has recovered, particularly semen.
For this reason, survivors may receive follow-up advice concerning sexual activity, testing and condom use based on current public-health guidance.
Survivors should follow the recommendations of their healthcare team rather than assuming they are immediately unable to transmit the virus once discharged.
How Long Does It Take for Ebola Symptoms to Appear?
The incubation period is generally 2 to 21 days.
This means symptoms can appear anywhere from two days to three weeks after infection.
A person who remains well after the appropriate monitoring period following a recognised exposure is unlikely to develop disease from that exposure.
Early Symptoms of Ebola
Symptoms often begin suddenly.
Common early symptoms include:
fever;
severe tiredness or weakness;
muscle pain;
headache; and
sore throat.
These symptoms are not specific to Ebola.
Malaria and several other common infections can produce similar symptoms, particularly in African settings.
Later Symptoms
As the disease progresses, people may develop:
vomiting;
diarrhoea;
abdominal pain;
rash;
impaired kidney or liver function; and
bleeding in some cases.
Bleeding can occur internally or externally, but it is important to understand that obvious bleeding is not present in every Ebola patient.
A person does not need to be bleeding to have Ebola disease.
When Should Ebola Be Suspected?
Fever, vomiting or diarrhoea alone does not mean someone has Ebola.
Suspicion becomes much stronger when symptoms occur together with an important epidemiological link, such as:
recent contact with a confirmed or probable Ebola patient;
caring for someone who subsequently developed Ebola;
attending or participating in burial activities involving an Ebola patient;
working in a healthcare facility where an Ebola exposure occurred;
handling potentially infected animals; or
recent presence in an area experiencing an active outbreak.
This combination of symptoms plus possible exposure is critical.
What Should You Do If You Think You Were Exposed?
Do not travel from clinic to clinic without informing healthcare professionals of the suspected exposure.
Instead, contact the appropriate public-health or emergency health authorities and explain:
your symptoms;
when they began;
where you have travelled;
who you have been in contact with; and
why you believe Ebola exposure may have occurred.
Healthcare workers can then arrange appropriate assessment while reducing the risk of exposing other patients, family members and staff.
How Is Ebola Diagnosed?
Symptoms alone cannot reliably diagnose Ebola.
Laboratory confirmation is required.
Reverse transcription polymerase chain reaction, or RT-PCR, is one of the principal laboratory methods used to confirm acute infection.
Other methods may include antigen-detection tests and antibody-based tests depending on the clinical and outbreak context.
Virus culture is possible but requires extremely high-level laboratory containment because Ebola samples pose a major biological hazard.
Testing should therefore be performed only through appropriately designated laboratories and public-health systems.
Why Is Diagnosis Difficult?
Early Ebola symptoms can resemble many other illnesses.
Depending on the setting, doctors may initially need to consider conditions such as:
malaria;
typhoid fever;
meningitis;
other viral haemorrhagic fevers; and
severe bacterial infections.
Travel history and exposure history are therefore essential.
How Is Ebola Treated?
Treatment has changed considerably since the large West African outbreak of 2014 to 2016.
Everyone with suspected or confirmed Ebola requires specialised medical care.
Intensive supportive care
Supportive treatment remains fundamental.
It can include:
oral or intravenous fluids;
correction of electrolyte abnormalities;
oxygen where necessary;
maintaining blood pressure;
treatment of fever and pain;
management of vomiting and diarrhoea;
nutritional support; and
treatment of other infections when present.
Starting appropriate care early can improve survival.
Are There Specific Medicines for Ebola?
Yes, for Ebola virus disease caused by Ebola virus.
WHO recommends two monoclonal antibody treatments:
Ansuvimab
Ansuvimab, also known as mAb114 and marketed in some settings as Ebanga, is a monoclonal antibody treatment directed against Ebola virus.
REGN-EB3
REGN-EB3 is a combination of monoclonal antibodies marketed as Inmazeb.
Both treatments have demonstrated benefits in Ebola virus disease and are recommended by WHO.
However, this does not mean that these medicines automatically work against every virus that causes Ebola disease.
What About Sudan and Bundibugyo Virus Disease?
There are currently no approved virus-specific treatments for diseases caused by Sudan virus or Bundibugyo virus comparable with the approved monoclonal antibody treatments for Ebola virus disease.
Supportive care therefore remains particularly important while candidate therapies are evaluated in clinical trials.
During the 2026 Bundibugyo outbreak in the DRC, research has included evaluation of several potential therapies, including monoclonal antibodies and antiviral approaches.
Is There an Ebola Vaccine?
Yes, but the answer depends on the virus involved.
Ervebo
Ervebo is a licensed vaccine used to prevent Ebola virus disease caused by Ebola virus.
It is commonly used during Ebola virus outbreaks, including through strategies designed to vaccinate people at greatest risk.
This vaccine has transformed outbreak response compared with the situation during the beginning of the 2014 West African epidemic.
Is Ervebo Effective Against Every Ebola Virus?
No.
Ervebo was developed and licensed for disease caused by Ebola virus.
It is not currently a licensed vaccine against Sudan virus or Bundibugyo virus.
This distinction is particularly important during the ongoing 2026 Bundibugyo outbreak.
Researchers are investigating whether existing or new vaccines can protect against Bundibugyo virus.
In August 2026, 70,000 Ervebo doses were allocated to the Democratic Republic of the Congo, including doses for a Phase 3 clinical trial examining whether the vaccine may provide protection against Bundibugyo virus and doses for frontline and health workers under specific recommendations.
The effectiveness of Ervebo against Bundibugyo virus in humans has not yet been established.
What About Vaccines for Sudan Virus?
There is currently no licensed vaccine specifically for Sudan virus disease.
However, candidate vaccines are being evaluated.
During Uganda's 2025 Sudan virus disease outbreak, researchers launched a clinical efficacy trial of a candidate Sudan virus vaccine during the outbreak.
Research continues.
How Is Ebola Prevented?
No single intervention can stop Ebola outbreaks.
Successful control usually involves several measures working together.
Avoid contact with infected body fluids
People should avoid unprotected contact with the blood or body fluids of anyone suspected or confirmed to have Ebola.
Use appropriate protective equipment
Healthcare workers caring for suspected or confirmed cases require appropriate infection-prevention procedures and personal protective equipment.
Practice safe and dignified burials
The body of someone who dies from Ebola can remain highly infectious.
Burials should therefore be managed by trained teams using appropriate infection-prevention procedures while respecting families and cultural practices.
Identify and monitor contacts
People who have had significant exposure to an infected person may be identified and followed for 21 days.
This allows symptoms to be detected quickly and reduces further transmission.
Isolate suspected cases appropriately
People with suspected Ebola should be assessed and managed through designated health systems rather than remaining in close contact with family members or other patients.
Vaccinate when appropriate
During outbreaks caused by Ebola virus, vaccination may form an important part of the response.
Vaccination recommendations depend on which virus is responsible for the outbreak.
Reduce wildlife exposure
In outbreak-risk areas, people should avoid handling animals found sick or dead.
Animal meat should be prepared and cooked appropriately.
Community engagement
Outbreak control depends heavily on community trust.
People are more likely to report symptoms, accept contact tracing, seek treatment and cooperate with safe burial measures when health authorities communicate openly and respectfully.
Why Are Healthcare Workers at Particular Risk?
Healthcare workers may encounter infected patients before Ebola has been recognised.
Risk increases when:
appropriate protective equipment is unavailable;
infection-control procedures are weak;
patients move between several healthcare facilities;
needles or equipment are handled unsafely; or
symptoms are incorrectly assumed to be malaria, typhoid or another common illness.
Training, triage procedures, protective equipment and rapid laboratory testing therefore play major roles in preventing healthcare-associated transmission.
What Is Contact Tracing?
Contact tracing involves identifying people who may have had meaningful exposure to an infected person.
Public-health teams assess the type of exposure and monitor people considered at risk.
During Ebola outbreaks, contacts are commonly followed for 21 days after their last possible exposure.
If symptoms develop, the person can be assessed and isolated rapidly.
Contact tracing helps stop chains of transmission before they expand.
Can Someone Recover From Ebola?
Yes.
Ebola is not automatically fatal.
Many people recover, particularly when they receive appropriate care early.
However, survivors may continue experiencing health problems after the acute illness.
These can include:
fatigue;
joint or muscle pain;
eye problems;
neurological symptoms;
psychological difficulties; and
other post-Ebola complications.
Survivor follow-up is therefore an important part of Ebola care.
Ebola Myths and Facts
Myth: Everyone with Ebola bleeds.
Fact: Bleeding can occur, but many patients do not develop obvious haemorrhage.
Myth: Ebola spreads easily through the air.
Fact: Ebola transmission primarily occurs through direct contact with infected blood or body fluids and contaminated materials.
Myth: Ebola has no treatment.
Fact: Intensive supportive care improves survival, and approved monoclonal antibody treatments are available for Ebola virus disease caused by Ebola virus.
Myth: One Ebola vaccine protects against every Ebola virus.
Fact: Existing licensed vaccines target specific viruses. Ervebo is licensed for Ebola virus disease and is not yet established as a general vaccine for all orthoebolaviruses.
Myth: Anyone with fever during an outbreak has Ebola.
Fact: Many diseases cause fever. Exposure history and laboratory testing are essential.
Frequently Asked Questions
Is Ebola the same as Marburg disease?
No.
Ebola viruses and Marburg virus belong to the same broader Filoviridae family, but they are different viruses and cause different diseases.
Can Ebola be treated successfully?
Yes.
Many patients recover, particularly when they receive early specialised supportive care.
Specific monoclonal antibody treatments are also available for Ebola virus disease caused by Ebola virus.
How soon after exposure do symptoms appear?
Usually between 2 and 21 days.
Can Ebola be diagnosed with symptoms alone?
No.
Laboratory testing is required for confirmation.
Does Ebola always cause bleeding?
No.
Bleeding occurs in some patients but is not required for diagnosis.
Is there an Ebola vaccine?
Yes.
Licensed vaccines are available against Ebola virus disease caused by Ebola virus. They do not automatically protect against all other orthoebolaviruses.
Can recovered patients still transmit Ebola?
The virus may persist for some time in certain body fluids, especially semen. Survivors should follow current medical and public-health advice concerning testing and sexual precautions.
The Bottom Line
Ebola disease is rare but potentially severe and fatal.
The most important warning sign is not fever alone. It is compatible symptoms combined with possible exposure to Ebola.
Modern Ebola management has improved considerably.
Early supportive care can save lives, laboratory testing can rapidly confirm infection, approved monoclonal antibody treatments are available for Ebola virus disease caused by Ebola virus, and effective vaccination is available against that virus.
However, different orthoebolaviruses present different challenges.
The ongoing Bundibugyo virus outbreak in Africa in 2026 shows why continued surveillance, research, community engagement, infection prevention and strong health systems remain essential.
Anyone who develops compatible symptoms after a credible Ebola exposure should contact public-health authorities or an appropriate healthcare facility immediately and explain the exposure before arriving for routine care.
References
World Health Organization. (2025). Ebola disease. WHO.
World Health Organization. (2026). Ebola vaccines: Questions and answers. WHO.
World Health Organization. (2026). Ebola outbreak: Democratic Republic of the Congo 2026. WHO.
World Health Organization & Africa Centres for Disease Control and Prevention. (2026). WHO and Africa CDC welcome the allocation of Ebola vaccines to the Democratic Republic of the Congo.
Centers for Disease Control and Prevention. Ebola disease basics.
Centers for Disease Control and Prevention. Ebola vaccine product information.
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