What is Ebola Virus Disease (EVD)?

Ebola Virus Disease (EVD) is a severe, often fatal illness caused by viruses in the genus Orthoebolavirus. It is classified as a Viral Hemorrhagic Fever (VHF) and is characterized by massive inflammation, tissue damage, and multi-organ failure. The virus disrupts blood clotting, leading to internal and external bleeding.

Known species include:

• Zaire ebolavirus – deadliest, most common
• Sudan ebolavirus – highly lethal
• Taï Forest ebolavirus – rare
• Bundibugyo ebolavirus – discovered 2007

Case fatality rate averages around 50%, ranging from 25% to 90% depending on strain and quality of care.

History and Origin of the Ebola Virus

First identified in 1976 near the Ebola River in the Democratic Republic of the Congo (then Zaire), with a simultaneous outbreak in South Sudan. The virus is zoonotic; fruit bats (Pteropodidae family) are considered the natural reservoir. Spillover events occur through contact with infected animals (bushmeat). The 2014–2016 West Africa epidemic infected over 28,000 people and caused more than 11,000 deaths.

Transmission Vectors and Incubation

EVD is NOT airborne. It spreads through direct contact (broken skin or mucous membranes) with:

• Blood, urine, saliva, sweat, feces, vomit, breast milk, or semen of a symptomatic or deceased person.
• Contaminated objects (needles, bedding).
• Sexual transmission: virus persists in semen for months after recovery.
• Infected animals or improperly cooked bushmeat.

Contagious only after symptoms appear. Incubation period: 2–21 days (average 8–10 days).

Symptom Timeline and Progression

Early symptoms are non-specific and mimic flu, malaria, or typhoid. Later stages involve bleeding and organ failure.

Who is at Higher Risk?

• Healthcare workers without proper PPE.
• Family caregivers and mourners involved in traditional burial rites.
• Laboratory personnel handling samples.
• Travelers to endemic or outbreak regions.

Ebola Diagnosis and Testing Procedures

Clinical diagnosis alone is unreliable. Definitive confirmation requires RT-PCR (Reverse Transcriptase Polymerase Chain Reaction) – the gold standard. It detects viral RNA directly in blood within days of symptom onset. Other methods include antigen ELISA and antibody tests (IgM/IgG). Testing must be performed under high biosafety containment.

Ebola Testing Facilities and Guidelines in India

India maintains strict surveillance via ICMR and MoHFW. While NIV Pune is the nodal center, private labs like DNA Labs India (ISO 9001 certified) offer advanced molecular testing with home sample collection.

Ebola Testing at DNA Labs India