What is Ebola?
Ebola virus disease (EVD) is a severe and often life-threatening viral illness caused by viruses in the Ebolavirus group. It can affect humans and some other mammals, causing fever, severe illness, and sometimes bleeding complications.
The disease was first identified in 1976 during outbreaks in what are now the countries of Democratic Republic of the Congo and Sudan.
Cause
Ebola disease is caused by several species of Ebola virus, including:
- Zaire ebolavirus
- Sudan ebolavirus
- Bundibugyo ebolavirus
- Taï Forest ebolavirus
The natural reservoir is believed to be certain species of fruit bats.
How Ebola Spreads
Ebola does not spread through the air like the common cold.
It spreads through direct contact with:
- Blood
- Vomit
- Saliva
- Sweat
- Urine
- Feces
- Semen
- Breast milk
- Body tissues of infected humans or animals
People can become infected through:
- Contact with infected animals (bats, monkeys, apes).
- Caring for infected patients without proper protection.
- Contact with contaminated needles or medical equipment.
- Traditional burial practices involving contact with the body.
Symptoms
Early Symptoms
Symptoms usually appear 2–21 days after exposure.
Common early symptoms include:
- Sudden fever
- Severe headache
- Muscle pain
- Weakness
- Fatigue
- Sore throat
Later Symptoms
As the disease progresses:
- Vomiting
- Diarrhea
- Stomach pain
- Skin rash
- Red eyes
- Liver and kidney problems
Severe Symptoms
In severe cases:
- Internal bleeding
- Bleeding from gums or nose
- Shock
- Multiple organ failure
Not every patient experiences visible bleeding.
Incubation Period
- Usually 8–10 days
- Range: 2–21 days
A person is generally not contagious until symptoms begin.
Diagnosis
Doctors may use:
- PCR testing
- Antigen tests
- Blood tests
Because early symptoms resemble malaria, typhoid, and influenza, laboratory testing is essential.
Treatment
There is no simple cure that instantly eliminates the virus, but outcomes have improved significantly.
Treatment includes:
- Intravenous fluids
- Electrolyte replacement
- Oxygen support
- Blood pressure management
- Treatment of secondary infections
For some Ebola virus species, monoclonal antibody therapies have been used successfully.
Early medical care greatly improves survival.
Prevention
Personal Protection
- Avoid contact with infected people.
- Avoid contact with blood and bodily fluids.
- Wash hands frequently.
- Use protective equipment when caring for patients.
Community Measures
- Rapid isolation of patients.
- Contact tracing.
- Safe burial practices.
- Infection-control procedures in healthcare settings.
Vaccines
A vaccine called Ervebo has been approved for protection against the Zaire strain of Ebola virus and has been used in outbreak control efforts.
Mortality Rate
The fatality rate varies by outbreak and virus species.
- Historically: about 25%–90%
- Average across outbreaks: around 50%
Survival improves with early diagnosis and modern supportive care.
Major Outbreaks
2014–2016 West Africa Outbreak
The largest Ebola outbreak in history affected:
- Guinea
- Liberia
- Sierra Leone
More than 28,000 cases and over 11,000 deaths were reported.
Democratic Republic of the Congo Outbreaks
Several significant outbreaks have occurred in the Democratic Republic of the Congo since 1976.
Uganda Outbreaks
Outbreaks caused by Sudan ebolavirus have occurred in Uganda.
Can Ebola Be Cured?
Some people recover completely, especially when:
- Diagnosed early
- Given intensive supportive treatment
- Managed in specialized healthcare facilities
Survivors may develop long-term effects such as:
- Joint pain
- Eye problems
- Fatigue
- Mental health difficulties
Key Facts
- Ebola is a viral hemorrhagic fever.
- It spreads through direct contact with infected body fluids, not casual airborne exposure.
- Symptoms include fever, weakness, vomiting, diarrhea, and sometimes bleeding.
- The incubation period is 2–21 days.
- Early treatment significantly improves survival.
- Vaccines and modern treatments have reduced deaths during recent outbreaks.
If you’d like, I can also explain Ebola’s structure, life cycle, pathogenesis (how it damages the body), and exam-focused MCQs for school, NEET, or competitive exams.