Ebola Virus Disease (EVD), commonly known as Ebola, is a severe and often fatal infectious disease caused by the Ebola virus. It affects humans and non-human primates such as monkeys, gorillas, and chimpanzees. Ebola outbreaks mainly occur in Africa and are associated with high mortality rates. The disease spreads rapidly through direct contact with infected bodily fluids and requires strict public health control measures to prevent epidemics.

Definition

Ebola Virus Disease is a viral hemorrhagic fever caused by viruses of the genus Ebolavirus, characterized by severe fever, internal and external bleeding, and multi-organ failure.

Causative Agent

Ebola is caused by the Ebola virus, which belongs to the family Filoviridae. There are several species, including:

• Zaire ebolavirus (most deadly)
• Sudan ebolavirus
• Bundibugyo ebolavirus
• Tai Forest ebolavirus
• Reston ebolavirus (mainly affects animals)

Transmission

Ebola spreads through direct contact with:

• Blood
• Vomit
• Feces
• Urine
• Saliva
• Sweat
• Semen
• Contaminated objects (needles, clothes, bedding)

It can also spread through:

• Handling infected dead bodies during burial
• Contact with infected animals (bats, monkeys)

It is not transmitted through air, water, or food in general conditions.

Symptoms

Symptoms appear after an incubation period of 2 to 21 days.

Early symptoms:

• High fever
• Severe headache
• Muscle pain
• Weakness
• Fatigue
• Sore throat

Later symptoms:

• Vomiting
• Diarrhea
• Rash
• Impaired kidney and liver function

Severe stage:

• Internal bleeding
• External bleeding (nose, gums, eyes)
• Organ failure
• Shock
• Death

Pathogenesis (How Ebola affects the body)

The virus enters the bloodstream and attacks:

• Immune system cells
• Blood vessels
• Liver and kidneys

This leads to:

• Severe immune suppression
• Blood clotting disorders
• Internal hemorrhage
• Multi-organ failure

Diagnosis

Ebola is diagnosed using:

• PCR (Polymerase Chain Reaction) test
• Blood tests
• Antigen detection tests
• ELISA tests

Early diagnosis is critical for survival and containment.

Treatment

There is no specific universal cure, but treatment improves survival:

• Rehydration therapy (fluids and electrolytes)
• Oxygen support
• Pain relief medication
• Blood pressure control
• Experimental antiviral drugs (e.g., monoclonal antibodies)

Early supportive care significantly increases survival chances.

Prevention

Ebola can be prevented through:

• Avoiding contact with infected persons
• Wearing protective equipment (gloves, masks, gowns)
• Safe burial practices
• Hand hygiene and disinfection
• Avoiding bushmeat (wild animals)
• Vaccination (for some strains, especially Zaire ebolavirus)

Vaccination

An effective vaccine exists for Ebola Zaire strain, used during outbreaks to protect healthcare workers and at-risk populations.

Complications

Ebola can cause:

• Severe dehydration
• Organ failure
• Hemorrhagic shock
• Neurological damage
• Death in many cases

Mortality Rate

The mortality rate varies by outbreak but can range from 25% to 90%, depending on virus strain and medical care availability.

Conclusion

Ebola is one of the most dangerous viral diseases known due to its high fatality rate and rapid spread through body fluids. However, with early detection, proper medical care, strict hygiene, and vaccination, outbreaks can be controlled and lives can be saved. Public health measures remain essential in preventing future epidemics.