Ebola virus is one of the viruses that raises concern because of the severity of the disease and its rapid progression in some cases. This is why many questions arise about how Ebola spreads, whether it can be transmitted through the air, what its symptoms and causes are, and how it is diagnosed, treated, and prevented. The disease may begin with symptoms such as fever, severe fatigue, muscle and body aches, and headache, followed by other symptoms such as vomiting and diarrhea as the illness progresses. In this article, Dalili Medical explores Ebola virus disease, its modes of transmission, main symptoms and causes, methods of diagnosis and treatment, and the most important ways to prevent infection.

What Is Ebola Virus?

Ebola virus is a highly dangerous virus that can cause an acute and potentially life-threatening disease. It belongs to the genus Orthoebolavirus within the Filoviridae family and has caused outbreaks in several regions around the world.

How Is Ebola Virus Transmitted?

Ebola virus is primarily transmitted through direct contact with the blood or body fluids of an infected person, or through contact with objects and surfaces contaminated with these fluids. Infection can also occur when handling the body of a person who has died from Ebola without following appropriate infection-prevention and control measures.

Is Ebola Virus Transmitted Through the Air?

Ebola does not spread through the air in the same way as respiratory diseases. Transmission primarily occurs through direct contact with the blood or body fluids of an infected person. Therefore, direct contact with an infected patient or exposure to their body fluids without appropriate protective measures presents a greater risk of infection.

What Is the Incubation Period of Ebola Virus?

The incubation period for Ebola is usually 2 to 21 days, meaning that symptoms may develop during this period after exposure to the virus.

When Does a Person With Ebola Become Contagious?

A person with Ebola generally becomes capable of transmitting the virus after symptoms begin. The risk of transmission increases as the disease progresses and the amount of virus in the patient's body fluids increases. Suspected and confirmed cases should therefore be isolated and managed using appropriate infection-control measures.

Is There a Treatment for Ebola Virus?

Yes. There are specific treatments for Ebola virus disease caused by Ebola virus (EBOV), including the monoclonal antibodies ansuvimab (mAb114) and REGN-EB3 (Inmazeb), along with intensive supportive care such as fluid and electrolyte replacement, treatment of complications, and monitoring of organ function.

Does a Patient With Ebola Need to Be Hospitalized?

Yes. When Ebola infection is suspected or confirmed, the patient requires assessment and treatment in an appropriately equipped healthcare facility under the supervision of medical professionals trained to manage highly infectious diseases. Ebola should not be treated at home because patients may require continuous monitoring and specialized management of fluids, blood pressure, organ function, and complications.

Is There a Vaccine Against Ebola Virus?

Yes. There is a vaccine available to prevent Ebola virus disease, most notably Ervebo, which is intended to protect against disease caused by Ebola virus (EBOV). It is particularly used as part of outbreak-response strategies, including vaccination of people at increased risk and contacts of cases according to public-health recommendations. However, there are currently no licensed vaccines that provide protection against all viruses within the Ebola group.

Can Ebola Virus Return After Recovery?

Ebola virus can persist in certain body fluids in some survivors for a period after recovery, particularly in certain sites where the immune system may have limited access. Rare cases of transmission after recovery have been documented due to persistent virus in semen. Therefore, survivors may require medical follow-up and specific guidance to reduce the risk of transmission, in accordance with recommendations from health authorities and the World Health Organization.

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Types of Ebola Virus

Viruses that cause Ebola diseases belong to the genus Orthoebolavirus within the Filoviridae family. The genus includes six recognized species, although their ability to cause disease in humans varies. Some have been proven to cause human disease, while this has not been established for others.

The Six Types of Ebola Virus

Type	Common Name	Known Impact on Humans
Ebola virus (EBOV)	Ebola virus	Causes Ebola virus disease (EVD) and is one of the species most strongly associated with major outbreaks.
Sudan virus (SUDV)	Sudan virus	Causes Sudan virus disease (SVD).
Bundibugyo virus (BDBV)	Bundibugyo virus	Causes Bundibugyo virus disease (BVD).
Taï Forest virus (TAFV)	Taï Forest virus	Has been confirmed to infect humans, but human cases are extremely rare.
Reston virus (RESTV)	Reston virus	Can infect humans, but has not been shown to cause clinical disease in humans.
Bombali virus (BOMV)	Bombali virus	Has been detected in bats, but no human disease-causing infections have been confirmed to date.

1. Ebola Virus (EBOV)

Ebola virus is the best-known species associated with Ebola disease. It has caused several major outbreaks, including the West African Ebola outbreak of 2014–2016.

A vaccine called Ervebo is available for this virus, and specific treatments based on monoclonal antibodies are also available, alongside supportive medical care.

2. Sudan Virus (SUDV)

Sudan virus causes a severe disease known as Sudan virus disease. It can spread between people through direct contact with the blood or body fluids of an infected person.

There is currently no licensed vaccine specifically approved for Sudan virus. Outbreak control therefore relies heavily on early detection, isolation, infection prevention and control, contact tracing, and supportive medical care, while research continues into potential vaccines and treatments.

3. Bundibugyo Virus (BDBV)

Bundibugyo virus causes Bundibugyo virus disease, a severe viral disease within the Ebola group.

There is currently no licensed vaccine specifically approved for BDBV. Likewise, Ervebo, which is intended to prevent Ebola virus disease caused by EBOV, is not considered a licensed vaccine for Bundibugyo virus disease.

4. Taï Forest Virus (TAFV)

Taï Forest virus is a very rare species. Human infections have been documented, but the number of known cases is extremely small compared with Ebola virus and Sudan virus.

As a result, it is not generally associated with large human outbreaks.

5. Reston Virus (RESTV)

Reston virus has been identified in animals, particularly some non-human primates and pigs. Although human exposure and infection have been documented, it has not been shown to cause clinical disease in humans.

This distinguishes it from EBOV, SUDV, and BDBV, which have been established as causes of human disease.

6. Bombali Virus (BOMV)

Bombali virus was discovered in bats, but no human infections resulting in clinical disease have been confirmed to date. Its significance for human health therefore remains an area of ongoing scientific research.

Ebola Virus Types at a Glance

Based on what is currently known, the six species can be broadly divided into:

Species confirmed to cause human disease:

• Ebola virus (EBOV)
• Sudan virus (SUDV)
• Bundibugyo virus (BDBV)
• Taï Forest virus (TAFV)

Species not currently confirmed to cause clinical disease in humans:

• Reston virus (RESTV)
• Bombali virus (BOMV)

Important: The term “Ebola” should not be used as though all six species are identical. They differ in important ways, including their clinical effects, outbreak patterns, available vaccines, and treatment options.

Main Causes of Ebola Virus Infection and Modes of Transmission

Ebola virus infection occurs when a person is exposed to the virus, most commonly through direct contact with the blood or body fluids of an infected person or animal. The risk of transmission increases when people care for infected patients, handle the bodies of deceased patients, or come into contact with contaminated equipment without following appropriate infection-prevention measures.

1. Exposure to an Infected Animal

Fruit bats are considered important potential natural reservoirs of Ebola viruses. Infection can occur when people come into contact with infected or dead animals.

Exposure may also involve certain wild animals, such as non-human primates, particularly when people come into contact with their blood, tissues, or body fluids.

2. Contact With the Blood or Body Fluids of an Infected Person

Direct contact with an infected person's body fluids is one of the main ways Ebola spreads. Potentially infectious fluids include:

• Blood.
• Vomit.
• Feces.
• Urine.
• Saliva.
• Sweat.
• Breast milk.
• Semen.
• Other body fluids that may contain the virus.

The risk of infection increases when these fluids come into contact with the eyes, mouth, nose, or broken skin.

3. Caring for an Ebola Patient Without Appropriate Protection

Healthcare workers and caregivers may be at increased risk of infection when providing direct care to patients without following appropriate infection-control measures or using suitable personal protective equipment.

Proper isolation, protective equipment, and safe handling of body fluids are therefore essential for preventing transmission in healthcare settings.

4. Contact With the Body of a Person Who Died From Ebola

The virus may remain present in the body of a deceased person, making direct contact with the body an important potential source of infection.

For this reason, the preparation and burial of people who have died from Ebola should be carried out by trained teams using safe infection-control procedures. Direct contact with the body or its fluids without appropriate protection should be avoided.

5. Contaminated Equipment and Medical Instruments

Ebola can be transmitted through needles or medical equipment contaminated with the blood or body fluids of an infected person, particularly when equipment is not properly disinfected or safely disposed of.

Proper handling of medical equipment and healthcare waste is therefore an important part of Ebola prevention.

Does Ebola Virus Spread Through the Air?

Ebola does not spread through the air in the same way as influenza or other respiratory diseases. Transmission primarily occurs through direct contact with the blood or body fluids of an infected person or materials contaminated with these fluids.

Therefore, simply being in the same place as an infected person does not automatically result in infection. However, direct contact with the patient or exposure to their body fluids without appropriate protective measures can lead to infection.

How Does Ebola Infection Begin in the Body?

After entering the body, the virus begins to infect and multiply within cells and then spreads to different tissues and organs. This can cause a severe immune response and disturbances in blood vessels, fluid balance, and the function of several organs, which can contribute to the severity of the disease.

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Symptoms and Diagnosis of Ebola Virus Disease in Detail

Ebola virus disease (EVD) is a rare but serious viral illness. Symptoms may begin suddenly after an incubation period of approximately 2 to 21 days following exposure to the virus. Symptoms alone cannot confirm Ebola because the early manifestations can resemble those of many other infectious diseases.

Symptoms of Ebola Virus Disease

Early Symptoms

Early symptoms often appear suddenly and may include:

• Fever.
• Severe fatigue and weakness.
• Muscle and body aches.
• Headache.
• Sore throat.
• Loss of appetite.
• General feeling of being unwell.

Symptoms as the Disease Progresses

As the illness progresses, additional symptoms may develop, including:

• Nausea and vomiting.
• Diarrhea.
• Abdominal pain.
• Skin rash.
• Abnormal liver function.
• Abnormal kidney function.

The severity of symptoms can vary from one person to another, and not every patient develops all of these symptoms.

Symptoms in Severe Cases

In severe cases, blood-clotting abnormalities and internal or external bleeding may occur. However, bleeding does not occur in every patient and is not necessarily an early symptom.

Possible bleeding manifestations include:

• Blood in vomit or stool.
• Bleeding from the nose or gums.
• Bleeding from other sites as a result of clotting abnormalities.

Advanced disease may also cause neurological problems, such as confusion and irritability, along with severe disturbances in fluid balance, blood pressure, and organ function.

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Diagnosis of Ebola Virus Disease

Ebola cannot be diagnosed based on symptoms alone because its early symptoms may resemble malaria, typhoid fever, meningitis, and other infectious diseases.

Diagnosis therefore relies on three main components:

Clinical suspicion + epidemiological history + laboratory testing.

1. Clinical Assessment

The healthcare professional evaluates the patient's symptoms, when they began, and whether the patient may have been exposed to a potential source of infection.

Findings that may raise suspicion include:

• Fever.
• Severe fatigue.
• Muscle aches.
• Headache.
• Sore throat.
• Vomiting and diarrhea.
• Abdominal pain.
• Skin rash.
• Abnormal liver or kidney function.
• Bleeding manifestations in some cases.

These symptoms do not necessarily mean that the person has Ebola. They indicate the need for further assessment and specialized testing when there has been a potential exposure.

2. Epidemiological History

Epidemiological history is an important part of the diagnostic assessment. Healthcare professionals may ask about:

• Contact with a confirmed or suspected Ebola patient.
• Contact with the body of someone who died from Ebola.
• Exposure to the blood or body fluids of an infected person.
• Contact with sick or dead wild animals in areas where Ebola is circulating.
• Recent travel to or residence in an area experiencing an Ebola outbreak.

A potential exposure combined with compatible symptoms increases the level of suspicion but does not confirm infection without laboratory testing.

3. Laboratory Tests

Ebola infection is confirmed using specialized laboratory tests, including:

A. RT-PCR Test

Reverse transcription polymerase chain reaction (RT-PCR) is used to detect the virus's genetic material in a clinical specimen and is one of the main tests used to confirm infection.

B. Antigen Detection Tests

These tests detect viral proteins in a clinical specimen. They may be useful in certain settings depending on the specific test, its availability, and its accuracy.

C. Antibody Tests

Some serological tests can detect antibodies such as IgM and IgG. Interpretation depends on the stage of illness and the specific test used.

D. Virus Isolation

The virus can be isolated using specialized laboratory techniques. However, this requires highly specialized facilities and strict biosafety measures, so it is not generally the routine diagnostic method.

4. What Samples Are Used for Diagnosis?

Blood samples are commonly used in symptomatic patients according to established medical protocols.

Because specimens that may contain Ebola virus can pose a serious biological hazard, they should be collected, transported, and tested by trained healthcare professionals and qualified laboratories using strict biosafety procedures.

Patients and family members should not attempt to collect specimens or perform Ebola testing themselves.

5. Differential Diagnosis of Ebola

Because early Ebola symptoms can resemble many other diseases, healthcare professionals may need to rule out other causes of fever, vomiting, diarrhea, and systemic symptoms, including:

• Malaria.
• Typhoid fever.
• Meningitis.
• Shigellosis.
• Sepsis or severe bacterial infection.
• Dengue fever.
• Yellow fever.
• Lassa fever.
• Rift Valley fever.
• Marburg virus disease and other viral hemorrhagic fevers.

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Drug Treatment for Ebola Virus Disease

Ebola virus disease is a serious medical condition requiring treatment in a specialized healthcare facility and should not be managed at home. Treatment is based on intensive supportive care, together with specific therapy when the patient is infected with a virus type for which an approved treatment is available.

First: Specific Treatments for Ebola Virus

For Ebola virus disease caused by Orthoebolavirus zairense (formerly known as Zaire ebolavirus), the World Health Organization recommends one of the following monoclonal-antibody treatments:

1. Ebanga — Ansuvimab

Ebanga (ansuvimab) is a monoclonal antibody that targets Ebola virus and interferes with its ability to attach to and enter cells.

It is approved for the treatment of Orthoebolavirus zairense infection in adults and children and is administered intravenously in a hospital under medical supervision.

2. Inmazeb — REGN-EB3

Inmazeb (REGN-EB3) is a combination of three monoclonal antibodies:

• Atoltivimab.
• Maftivimab.
• Odesivimab.

It is used to treat Orthoebolavirus zairense infection in adults and children.

Important: Ebanga and Inmazeb are not routinely administered together. The medical team determines the appropriate treatment based on the patient's diagnosis, clinical condition, treatment protocol, and drug availability.

Second: Supportive Treatment

Supportive care is a critical component of Ebola treatment and may include:

• Fluid and electrolyte replacement by mouth or intravenously, depending on the patient's condition.
• Treatment of vomiting and diarrhea and prevention of dehydration.
• Appropriate treatment of pain and fever.
• Adequate nutritional support.
• Monitoring kidney and liver function.
• Treatment of low blood pressure and shock when they occur.
• Oxygen therapy when needed.
• Diagnosis and treatment of coexisting infections, such as malaria or bacterial infections, when present.
• Continuous monitoring of the patient's overall condition and organ function.

Early supportive care is particularly important because Ebola can cause severe dehydration, electrolyte disturbances, shock, bleeding complications, and multiple-organ dysfunction.

Third: Medicines Not Recommended by the World Health Organization for Ebola Treatment

Several medicines and experimental treatments have been studied during Ebola outbreaks. However, according to available evidence and current treatment guidance, ZMapp and remdesivir are not recommended for the treatment of confirmed Ebola virus disease.

Fourth: Are There Medicines for All Types of Ebola Virus?

No. This is an important distinction. The currently available specific treatments are directed against Orthoebolavirus zairense. There are no similarly approved specific treatments for Sudan virus disease, Bundibugyo virus disease, or other related filovirus diseases at present, although research and clinical trials continue to evaluate potential treatments.

Fifth: Why Should Treatment Begin Early?

Early diagnosis and prompt initiation of intensive supportive care can improve the chances of survival and help reduce complications. Confirming the virus type is also important because available vaccines and specific treatments are not necessarily effective against, or approved for, every Ebola virus species.

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Surgical Treatment of Ebola Virus Disease

There is no surgical procedure that eliminates Ebola virus from the body. Ebola is a systemic viral infection that can affect multiple organs and body systems. Therefore, treatment primarily relies on intensive supportive care and specific antiviral therapy when an appropriate treatment is available for the infecting virus, rather than surgery.

Supportive medical care may include fluid replacement, treatment of shock, monitoring of organ function, and management of complications and coexisting infections.

Can an Ebola Patient Ever Need Surgery?

In exceptional circumstances, a patient may require a medical, interventional, or surgical procedure to treat a specific complication, rather than to treat the Ebola virus itself.

Such decisions must be made by a specialized medical team after carefully assessing the patient's condition and balancing potential benefits against the risks.

1. Management of Severe Bleeding and Hemorrhagic Complications

Ebola can cause blood-clotting abnormalities and bleeding in some severe cases. The main priorities are supporting circulation, correcting clotting abnormalities, and treating the source of bleeding.

If severe bleeding requires specialized intervention, the medical team may consider an appropriate procedure to control it. However, surgical procedures can carry significant risks because of clotting abnormalities and potential exposure to infectious blood and body fluids.

2. Interventional Procedures and Venous Access

Some critically ill patients may require medical procedures to help the healthcare team:

• Administer fluids and medications.
• Provide intensive supportive treatment.
• Closely monitor the patient's condition.
• Manage low blood pressure or shock.

These procedures do not eliminate the virus. Instead, they help support essential body functions while the patient receives treatment for the infection.

3. Treatment of Complications That May Require Intervention

If the patient develops another medical problem requiring urgent medical or surgical intervention, the treating team may consider an appropriate procedure.

The decision depends on the nature of the complication, the patient's overall condition, the risk of bleeding, and the risk of infection.

Therefore, having Ebola alone is not an indication for surgery.

Why Is Unnecessary Surgery Avoided?

Several factors make unnecessary surgery particularly undesirable in patients with Ebola, including:

• Possible blood-clotting abnormalities.
• Increased risk of bleeding and procedure-related complications.
• Multiple-organ dysfunction in severe disease.
• Risk of exposing healthcare workers to the patient's blood and body fluids.
• The need for extremely strict infection-prevention measures during invasive procedures.

Any necessary operation or invasive intervention should therefore be performed only when there is a clear medical benefit, with appropriate infection-control precautions.

Is Surgery Part of the Main Treatment for Ebola?

No. The main treatment consists of intensive medical care, which may include:

• Fluid and electrolyte replacement.
• Treatment of shock and low blood pressure.
• Oxygen support when necessary.
• Monitoring kidney and liver function.
• Treatment of coexisting infections and complications.
• Specific monoclonal-antibody treatment when appropriate for the infecting virus.

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What Is the Main Treatment for Ebola Instead of Surgery?

Treatment of Ebola virus disease does not depend on surgery. Instead, it relies on intensive supportive medical care, together with specific antiviral treatment when appropriate for the virus causing the disease.

The main goals are to maintain essential body functions, control complications, and reduce the risk of death.

Main Components of Supportive Treatment

• Fluid and electrolyte replacement and treatment of dehydration, either orally or intravenously depending on the patient's condition.
• Treatment of shock and low blood pressure when they occur.
• Monitoring and management of blood glucose, electrolytes, kidney function, and liver function.
• Treatment of fever, pain, vomiting, diarrhea, and other symptoms.
• Appropriate nutritional support.
• Oxygen or respiratory support when necessary.
• Diagnosis and treatment of coexisting infections, such as malaria or bacterial infections, when confirmed.
• Continuous monitoring to identify and treat complications as early as possible.

For Ebola virus disease caused by Ebola virus (EBOV), specific monoclonal-antibody treatments include ansuvimab (mAb114) and REGN-EB3 (Inmazeb), according to applicable treatment guidance.

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Prevention of Ebola Virus Disease

Preventing Ebola depends on avoiding exposure to the virus, identifying cases early, isolating infected patients, monitoring contacts, applying infection-control measures, and using vaccination when appropriate for the virus involved.

No single measure is sufficient by itself to control an outbreak.

1. Avoid Contact With Body Fluids of an Infected Person

Ebola is primarily transmitted through direct contact with the blood or body fluids of an infected person. Therefore, direct contact with the following should be avoided:

• Blood.
• Vomit and diarrhea.
• Urine and feces.
• Saliva and sweat.
• Breast milk.
• Semen.
• Other secretions and body fluids.
• Tissues and body fluids from a person who has died from Ebola.

Clothing, bedding, or equipment contaminated with body fluids should also not be handled without appropriate protective measures.

2. Avoid Handling the Bodies of People Who Died From Ebola

The bodies of people who have died from Ebola may remain infectious. Therefore, people should not directly touch, wash, or prepare the body for burial.

Burial procedures should be performed by trained teams using safe practices that protect both the community and the dignity of the deceased.

3. Avoid Sick or Dead Wild Animals

In areas where Ebola is circulating, people should avoid contact with bats, non-human primates, and other wild animals that are sick or dead.

Contact with their blood, body fluids, or tissues should be avoided, and raw meat from potentially infected wild animals should not be consumed.

4. Prevention in Healthcare Facilities

Healthcare workers require strict precautions when caring for suspected or confirmed patients. Measures include:

• Early identification of suspected cases.
• Appropriate isolation according to established protocols.
• Use of suitable personal protective equipment.
• Safe handling of blood and clinical specimens.
• Proper cleaning and disinfection of surfaces and equipment.
• Safe disposal of medical waste.
• Training healthcare workers in infection prevention and control.
• Avoiding unnecessary exposure to the patient's blood or body fluids.

Effective infection prevention and control in healthcare facilities is one of the most important components of controlling Ebola outbreaks.

5. Ebola Vaccination

The Ervebo vaccine is available for prevention of Ebola virus disease caused by Ebola virus (EBOV). It is particularly used as part of outbreak-response strategies and for people identified by public-health authorities as being at increased risk.

One important strategy is ring vaccination, in which contacts of confirmed or probable cases, as well as other people at increased risk, may be vaccinated to help interrupt chains of transmission.

Important: Ervebo should not be considered a vaccine against every Ebola virus species. Vaccine availability and protection differ according to the virus responsible for the outbreak.

6. Early Case Detection and Contact Tracing

During an outbreak, control efforts generally follow a sequence such as:

Case detection → laboratory confirmation → safe isolation and care → identification of contacts → health monitoring of contacts → early detection and treatment of new cases.

This approach helps interrupt chains of transmission and limit the spread of an outbreak.

7. Health Monitoring After Potential Exposure

If a person has been exposed to a suspected or confirmed Ebola patient or has been in an area where Ebola transmission is occurring, they should follow instructions from public-health authorities and monitor for symptoms during the recommended monitoring period.

The 21-day period represents the upper end of the usual Ebola incubation period, so monitoring during this period is important after a genuine exposure.

If compatible symptoms develop, the person should promptly contact an appropriate healthcare service rather than attempting to diagnose or treat Ebola at home.