About Ebola Virus Disease

Overview

Ebola virus disease (EVD) is a severe and often fatal illness that affects humans. It is a viral hemorrhagic fever characterized by severe, multisystem disease and a high case fatality rate. The Ebola virus is a member of the Filoviridae viral family and is transmitted through direct contact with blood or other bodily fluids of symptomatic individuals, as well as contaminated materials or the dead body of an infected person. EVD can be transmitted from wild animals to humans or through human-to-human transmission. Outbreaks of EVD have occurred primarily in isolated communities in the central African forest belt, with the largest outbreak recorded in West Africa from 2014 to 2016. Healthcare workers and caregivers are particularly vulnerable to infection. The disease can cause significant strain on healthcare systems and has social, economic, and public health implications.

Causes and Risk Factors

The disease causes of Ebola virus disease (EVD) are related to the Ebola virus itself. The virus is transmitted to humans through contact with infected animals, such as fruit bats or primates, or through direct contact with bodily fluids of infected individuals. Once inside the body, the virus targets immune cells and other cells, leading to widespread inflammation and damage to blood vessels, organs, and tissues.

Non-modifiable risk factors of EVD cannot be changed or controlled. These include:

• Age: Younger age has been associated with a higher risk of death in children with EVD.
• Sex: Studies have shown that women may be more susceptible to Ebola virus infection.
• Health-care responsibilities: Individuals with formal or informal health-care responsibilities in the community have a higher risk of Ebola virus infection.

Modifiable risk factors, factors that can be influenced or changed, of EVD are not clearly known because there isn’t enough data. Some potential modifiable factors that may affect the outcome of EVD include:

• Adherence to infection control measures: Proper use of personal protective equipment and following strict infection control protocols can help reduce the risk of Ebola virus transmission.
• Timely access to medical care: Seeking medical care early in the course of illness may improve outcomes for individuals with EVD.
• Availability of resources: Having adequate supplies, trained health personnel, and safe working environments can contribute to better management and prevention of EVD.

It's important to note that these modifiable factors are based on general principles of infection control and healthcare provision and may not have been specifically studied in relation to EVD. Always consult with healthcare professionals for personalized advice on preventing or managing EVD.

Symptoms

The most common early symptoms of Ebola virus disease (EVD) include:

• Fever
• Headache
• Fatigue
• Muscle pain
• Vomiting
• Diarrhea

As the disease progresses or reaches a higher severity, other common symptoms may occur, such as:

• Abdominal pain
• Weakness and fatigue
• Sore throat
• Loss of appetite
• Unexplained bleeding or hemorrhaging (which occurs later in the disease and is not always present)
• Red eyes and skin rash (less common)
• Neurological symptoms like altered consciousness, neck stiffness, and seizures (rare)

It's important to note that these symptoms are not specific to EVD and can be associated with other febrile illnesses. Early identification of suspected EVD cases can be challenging due to the similarity of symptoms with other diseases like malaria, typhoid fever, and influenza. If you experience any of these symptoms, especially if you have been in an area with known EVD cases or have had contact with an infected person, seek medical attention immediately.

Diagnosis

To diagnose Ebola Virus Disease (EVD), healthcare providers commonly perform the following examinations, tests, and procedures:

• Physical examination: The healthcare provider will conduct a physical exam to look for physical signs of the disease, such as fever, rash, bleeding, and signs of dehydration or organ dysfunction.
• Laboratory tests: These tests involve testing blood, urine, or body tissues to detect the presence of the virus. Specific tests, such as real-time PCR (polymerase chain reaction), are commonly used to identify Ebola’s genetic material, while antigen detection tests can confirm the presence of viral proteins. These tests are ordered based on the patient’s symptoms and exposure history. Other examples of testing include:
  • Complete blood counts
  • Liver function tests
  • Serum chemistries
  • Malaria tests: Malaria tests are used not to directly diagnose Ebola but rather to rule out malaria, which shares similar symptoms. Telling the difference between these diseases is essential in areas where both malaria and Ebola are common.

To determine the severity of EVD, additional tests may be performed to check how the disease is affecting the body:

• Coagluation studies: These tests check how well your blood is clotting, as severe cases of EVD can cause problems like uncontrolled bleeding.
• Electrolyte and kidney function tests: These help detect dehydration or kidney problems, which can happen as the disease progresses.
• Liver function tests: These measure how well your liver is working, as EVD can damage this organ.
• Lactate levels: High levels of lactate in the blood can be a sign of serious infection or organ failure.
• Chest X-rays or heart exams: In very serious cases, doctors might use these tests to check for problems like fluid in the lungs or heart damage.

Remember to always follow up with your healthcare provider if your symptoms worsen or change after the initial examinations and tests. They can recommend further procedures if needed.

Treatment Options

The goals of treatment for Ebola virus disease (EVD) are to rapidly identify and isolate cases, prevent transmission, and provide timely treatment to affected patients. Here are the recommended treatment approaches and how they work to achieve these goals:

• Supportive care: This involves managing complications and providing necessary support to patients. It includes:
  • Volume repletion: Administering large volumes of intravenous fluids to correct dehydration caused by diarrhea and vomiting
  • Blood pressure maintenance: Using vasopressors if needed to maintain blood pressure
  • Oxygenation: Ensuring adequate oxygen levels
  • Pain control: Managing pain experienced by patients
  • Nutritional support: Providing appropriate nutrition to support recovery
  • Treatment of secondary bacterial infections: Administering antibiotics if necessary
  • Infection prevention and control measures: Implementing measures to prevent the spread of the virus
• Antiviral therapies: Directly targeting critical stages in the viral life cycle, such as viral replication, can be a potential approach. However, specific antiviral medications for EVD are still under evaluation.
• Vaccines are available for Zaire ebolavirus.

It's important to note that there are currently no approved specific medications for treating EVD. Supportive care remains the mainstay of treatment.

Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Other side effects can occur. Check with your health care professional or read the information provided with your medication for additional side effect information.