Ebola Disease: Prevention and Early Recognition Guide

What is Ebola Disease?

Ebola disease (formerly called Ebola hemorrhagic fever) is a rare but severe illness caused by viruses belonging to the Orthoebolavirus genus of the filoviridae family. Six species of Orthoebolaviruses have been identified to date, with three known to cause large outbreaks: Ebola virus (EBOV) causing Ebola virus disease (EVD) Sudan virus (SUDV) causing Sudan virus disease (SVD) Bundibugyo virus (BDBV) causing Bundibugyo virus disease (BVD).

Ebola virus was first discovered in 1976 near the Ebola River in what is now the Democratic Republic of the Congo. The disease primarily affects humans and nonhuman primates and can cause serious and often deadly disease, with a mortality rate as high as 80 to 90 percent. However, The average Ebola disease case fatality rate is around 50%. Case fatality rates have varied from 25–90% in past outbreaks.

Early intensive supportive care with rehydration and the treatment of symptoms improves survival. Seeking early care can be lifesaving. This makes understanding prevention strategies and early recognition absolutely critical for protecting yourself and your community.

Section 2: Essential Ebola Facts

Symptoms

Early “Dry” Symptoms (First 2-5 days):

• fever, aches, pains, and fatigue
• elevated body temperature or subjective fever, chills, myalgia, and fatigue
• Headache and sore throat
• muscle pain, headache and sore throat

Late “Wet” Symptoms (After 4-5 days):

• severe watery diarrhea, nausea, vomiting, and abdominal pain
• symptoms of impaired kidney and liver functions
• chest pain, shortness of breath, headache, or confusion
• eye irritation and redness. Hiccups have been reported
• Unexplained bleeding (less common than perceived)

Causes

Ebola disease is caused by a group of viruses, known as orthoebolaviruses. It is thought that fruit bats of the Pteropodidae family are natural hosts of the Orthoebolavirus.

Types

Four orthoebolaviruses cause illness in people:

• Ebola virus (species Orthoebolavirus zairense) causes Ebola virus disease. Sudan virus (species Orthoebolavirus sudanense) causes Sudan virus disease. Taï Forest virus (Taï Forest ebolavirus, formerly Cote d’Ivoire ebolavirus), Bundibugyo virus (Bundibugyo ebolavirus)

How It Spreads

People can be infected with the Ebola virus through direct contact (like touching) with: Blood or body fluids (urine, saliva, sweat, feces, vomit, breast milk, semen) of a person who is sick with or has died from Ebola disease.

Important: Ebola virus is not contagious until symptoms appear and Ebola virus CANNOT spread to others when a person has no signs or symptoms of EVD.

Regions Where It Is Found

Orthoebolaviruses are found primarily in sub-Saharan Africa. Recent outbreaks have occurred in:

• Democratic Republic of the Congo
• Guinea
• Sierra Leone
• Liberia
• Uganda

You Might Be at Higher Risk if You:

• Healthcare providers and family members caring for someone with Ebola disease without proper infection control methods have the highest risk of infection
• Healthcare providers, family, and friends in close contact with EVD patients are at the highest risk of getting sick with EVD because they may be exposed to infected blood and body fluids
• Travel to or live in affected regions during outbreaks
• Handle infected animals or consume bushmeat
• Workers who interact with people, animals, goods, and equipment arriving in the U.S. from foreign countries with current EVD outbreaks are at the greatest risk for exposure

How Doctors Diagnose

Healthcare providers use polymerase chain reaction (PCR) testing to diagnose Ebola disease. They can also test for orthoebolavirus antibodies. Ebola virus can be detected in blood after onset of symptoms. It may take up to three days after symptoms start for the virus to be detected.

If a person has early symptoms of EVD and there is reason to believe the virus should be considered, the patient should be isolated and public health professionals notified.

Treatment and Medications

Two FDA-approved treatments are currently available to treat Ebola disease (species Orthoebolavirus zairense only): Inmaze and Ebang. Both treatments were evaluated, along with two others, in a randomized controlled trial in the Democratic Republic of the Congo. Overall survival was higher for patients who received either Inmazeb or Ebang.

Supportive Care Includes:

• Fluids and electrolytes (body salts) by mouth or into their veins. Medicine to support blood pressure, reduce vomiting and diarrhea, and to manage fever and pain. Treatment for other infections, if they occur

Prevention Methods

• Vaccination: The U.S. Food and Drug Administration has approved ERVEBO® for the prevention of Ebola disease (species Orthoebolavirus zairense only)
• Hand Hygiene: Practicing good hand hygiene is an effective method of preventing the spread of dangerous germs, like the Ebola virus. Proper hand hygiene means washing hands often with soap and water or an alcohol-based hand sanitizer
• Avoiding Contact: Avoid contact with body fluids from people and animals, including Blood and body fluids, like urine, feces, saliva, sweat, vomit, breast milk, amniotic fluid, semen, and vaginal fluid from people who are sick

Section 3: Evidence-Based Prevention Strategies

Personal Protection Measures

1. Hand Hygiene If soap and water are not available, use hand sanitizer containing at least 60 percent alcohol. Hand hygiene is especially important after removing PPE and prior to eating, drinking, smoking, or bathroom use. This is your first and most important line of defense.
2. Avoid High-Risk Contacts When traveling to affected regions, Practice careful hygiene. Wash your hands with soap and water or an alcohol-based hand sanitizer. Avoid contact with blood and body fluids. Avoid contact with people who have a fever, are vomiting, or appear ill.
3. Safe Travel Practices Do not handle items that may have come in contact with an infected person’s blood or body fluids. This includes clothes, bedding, needles, and medical equipment. Avoid funeral or burial rituals that require handling the body of someone who has died from Ebola.
4. Wildlife and Food Safety Avoid contact with bats and nonhuman primates or blood, fluids, and raw meat prepared from these animals. This includes avoiding bushmeat consumption in affected regions.

Healthcare Worker Protection

Healthcare workers require specialized protection due to their elevated risk. If ebolavirus contamination is known or suspected, at minimum, a long-sleeved, closed-front gown, disposable nitrile or powder-free latex gloves, eye protection (goggles or face shield), and a NIOSH-certified N-95, fit-tested respirator should be worn.

Healthcare workers who are required to wear PPE, including those involved in the care of EVD patients, receive training on how to properly use PPE and demonstrate competency in donning and doffing according to OSHA’s PPE standard.

Community-Level Prevention

1. Outbreak Response Participation Community engagement is key to successfully controlling any outbreak. Outbreak control relies on using a range of interventions, such as clinical care, surveillance and contact tracing, laboratory services, infection prevention and control in health facilities, safe and dignified burial.
2. Health Monitoring If you believe that you may have been exposed to ebolavirus, tell your employer, and monitor your health for 21 days. If you return from an area with an ongoing Ebola outbreak, monitor your health for 21 days.

Section 4: Early Recognition and When to Seek Medical Care

Recognizing Early Warning Signs

Early recognition is crucial because Early symptoms of EVD such as fever, headache, and weakness are not specific to Ebola virus infection and are seen in patients with more common diseases, like malaria and typhoid fever.

Key Recognition Criteria: You need BOTH conditions present:

1. Symptoms suggestive of Ebola – fever, headache, muscle pain, fatigue

2. Possible exposure within 21 days – Someone with Ebola disease may start getting sick 2 to 21 days after contact with an orthoebolavirus. However, on average, symptoms begin 8 to 10 days after exposure

When to Seek Immediate Medical Care

Seek emergency medical care immediately if you have:

• If you become ill with a fever, sore throat, weakness, stomach pains, loss of appetite, vomiting and/or diarrhea, or have unexplained bruising or bleeding, consult with your healthcare provider, and contact your state or local health department for additional guidance
• Recent travel to an Ebola-affected region within 21 days
• Contact with someone suspected or confirmed to have Ebola

Important: After you return, pay attention to your health for 21 days. Seek medical care right away if you develop any symptoms.

Medical System Response

Healthcare providers with concerns about Ebola infection during their patient’s differential diagnosis should contact their jurisdictional health department immediately (via the 24-hour Epi-On-Call contact list) and follow jurisdictional protocols for patient assessment.

CDC’s Viral Special Pathogens Branch (VSPB) is available 24/7 for consultations on Ebola disease by calling the CDC Emergency Operations Center at 770-488-7100 and requesting VSPB’s on-call epidemiologist.

Disease Progression Understanding

Early Phase (Days 1-5): Patients with Ebola disease generally have an abrupt onset of fever and symptoms typically 8 to 10 days after exposure. Initial signs and symptoms are nonspecific and may include elevated body temperature or subjective fever, chills, myalgia, and fatigue.

Progression Phase (Days 4-5+): Four to five days after symptom onset, patients can progress to gastrointestinal symptoms, or “wet” symptoms. “Wet” symptoms can include severe watery diarrhea, nausea, vomiting, and abdominal pain.

Outcome Factors: Patients who pass away from Ebola disease usually develop more severe symptoms early in the illness. Patients who survive may have fever for several days and begin improving about 6 days after symptoms started.

Section 5: Global Preparedness and Surveillance

Importance of Early Detection Systems

Investments in early detection and response in disease-endemic countries can prevent virus spread after a spillover event. In Uganda, VHF detection rates dropped from an average of 2 weeks to only 2 days after targeted investments in diagnostic capacity were initiated.

Furthermore, earlier detection translated into more rapid control measure use; the average numbers of cases per outbreak dropped from >100 before to 5 cases after those investments.

Lessons from Recent Outbreaks

When Guinea faced Ebola again in 2021, they identified the outbreak in 15 days and received laboratory confirmation in one day. Instead of international experts, 179 CDC-trained local disease detectives investigated. The outbreak was stopped after only 23 cases.

This demonstrates how proper preparation and early recognition systems can dramatically reduce outbreak severity.

Section 6: Special Considerations for Travelers

Pre-Travel Planning

Before traveling to regions with potential Ebola risk, consult with healthcare providers about:

• Vaccination is recommended for U.S. adults 18 years and older who are at potential risk of exposure to the Ebola virus
• Current outbreak status in your destination
• Proper travel health insurance

During Travel Precautions

If you plan to travel to one of the countries where Ebola is present, the CDC recommends taking the following steps to prevent illness: Practice careful hygiene. Wash your hands with soap and water or an alcohol-based hand sanitizer.

Specific precautions include:

• Avoid hospitals in West Africa where Ebola patients are being treated. If you need medical care, the United States embassy or consulate is often able to provide advice about facilities
• Maintain strict hygiene practices
• Avoid contact with sick individuals

Post-Travel Monitoring

If you return from an area with an ongoing Ebola outbreak, monitor your health for 21 days. Seek medical care immediately if you develop symptoms of Ebola disease.

Conclusion

Ebola disease prevention and early recognition require a comprehensive understanding of transmission routes, symptoms, and appropriate response measures. Early intensive supportive care including rehydration and treatment of specific symptoms, can improve survival. Seeking early care can be lifesaving.

The key to protection lies in:

1. Understanding your risk level

2. Practicing proper prevention measures

3. Recognizing early symptoms

4. Seeking immediate medical care when appropriate

5. Following public health guidance during outbreaks

Remember that The viruses that cause Ebola disease pose little risk to travelers or the general public, but maintaining vigilance and following evidence-based prevention strategies ensures the best protection for you and your community.

For the most current information and guidance, always consult official sources such as the CDC ¹ , WHO ² , and your local health department.