Ebola Virus Disease (EVD)

Ebola Virus Disease (EVD), formerly known as Ebola hemorrhagic fever, is a rare but severe and often fatal illness in humans. It is caused by infection with one of the Ebola virus species, belonging to the family Filoviridae. Understanding EVD is critical for global health security, public health preparedness, and international cooperation in disease control, aligning with India's commitments to global health initiatives.

Understanding major communicable diseases, their global impact, and national/international response mechanisms is crucial for GS2 (Health) and GS3 (Science & Tech). UPSC often asks about specific diseases, their causes, symptoms, prevention, and control.

Disease Type

Viral Hemorrhagic Fever (VHF)

Causative Agent

Ebola virus (genus Ebolavirus, family Filoviridae)

Natural Reservoir

Fruit bats are considered the likely natural host

First Identified

1976, near the Ebola River in the Democratic Republic of Congo (then Zaire)

Ebola virus is transmitted to people from wild animals and spreads in the human population through direct contact with the blood, secretions, organs or other bodily fluids of infected people, and with surfaces and materials (e.g. bedding, clothing) contaminated with these fluids. Healthcare workers are at high risk if proper infection control measures are not followed. Burial ceremonies where mourners have direct contact with the body of the deceased can also play a significant role in transmission.

Symptoms of EVD typically appear 2 to 21 days after exposure to the virus. Initial symptoms include sudden onset of fever, fatigue, muscle pain, headache, and sore throat. These are followed by vomiting, diarrhea, rash, symptoms of impaired kidney and liver function, and in some cases, both internal and external bleeding (e.g., oozing from the gums, blood in the stools). Laboratory tests show low white blood cell and platelet counts and elevated liver enzymes.

Fatality Rate

Can be high, averaging around 50%, but varies significantly by outbreak and species.

Incubation Period

2 to 21 days (average 8-10 days).

Vaccine Availability

Ervebo (rVSV-ZEBOV) vaccine approved for Zaire ebolavirus.

Treatment

Supportive care is primary; monoclonal antibody treatments (Inmazeb, Ebanga) are available for Zaire ebolavirus.

Global Health Emergency

WHO has declared Public Health Emergencies of International Concern (PHEIC) for EVD outbreaks multiple times.

Zoonotic Origin

Transmitted to humans from wild animals, then human-to-human.

For UPSC Prelims, questions on EVD typically focus on factual aspects: the type of virus (Filoviridae), its zoonotic reservoir (fruit bats), modes of transmission (direct contact with bodily fluids), key symptoms (hemorrhagic fever), the name of the approved vaccine (Ervebo), and the role of international organizations like WHO in declaring Public Health Emergencies of International Concern (PHEIC). Candidates should also be aware of the geographical regions most affected by outbreaks.

For UPSC Mains (GS2 - Health, GS3 - Science & Technology), EVD is relevant for questions on global health security, India's preparedness for emerging infectious diseases, international cooperation in disease control, ethical considerations during outbreaks (e.g., travel bans, quarantine), and the socio-economic impact of epidemics. Discussions might include the challenges of vaccine distribution, the role of public health infrastructure, and the importance of 'One Health' approach in preventing zoonotic spillover. India's experience in managing similar health crises and its contribution to global health initiatives are also important angles.

• Ebola is a severe, often fatal viral hemorrhagic fever.
• Transmitted through direct contact with bodily fluids of infected animals or humans.
• Outbreaks primarily occur in sub-Saharan Africa.
• WHO's declaration of a Public Health Emergency of International Concern (PHEIC) triggers global response.
• National preparedness includes surveillance, isolation, and border control measures.

Recent Ebola outbreaks in Africa have prompted the World Health Organization (WHO) to declare international emergencies, highlighting the ongoing threat and the need for robust global and national preparedness, including travel restrictions and enhanced surveillance.

The recurring nature of Ebola outbreaks, particularly in the Democratic Republic of Congo and other African nations, underscores the persistent challenge EVD poses to global health security. The WHO's declaration of a Public Health Emergency of International Concern (PHEIC) during significant outbreaks mobilizes international resources and coordination, emphasizing the need for rapid response, vaccine deployment, and robust public health measures.