Mountain Gorillas, Genetics, and the Ebola Threat
Mountain gorillas (Gorilla beringei beringei) are among the primates most closely related to humans. Genetic studies show that they share more than 98 % of their DNA with Homo sapiens, a similarity that underpins both their remarkable behavioural parallels and their susceptibility to human‑borne pathogens.
Why Genetic Similarity Matters for Disease Risk
The high degree of genomic overlap means that viruses capable of infecting humans can, under certain conditions, also infect gorillas. Ebola virus disease (EVD), caused by filoviruses of the genus Ebolavirus, has demonstrated this cross‑species potential in Central Africa, where outbreaks have repeatedly spilled over from humans to wildlife and vice‑versa.
Ebola in the Gorilla Range: Past Impacts and Current Concerns
Historical records indicate that western lowland gorillas (Gorilla gorilla gorilla) in Gabon and the Republic of Congo have suffered devastating losses from Ebola. According to field surveys cited by the Africa CDC, over 5,000 gorillas have died from the virus in the last three decades.
While Uganda’s mountain gorilla populations have not yet recorded a confirmed Ebola case, the region is currently experiencing an outbreak that began in mid‑May 2024. The Africa CDC reports:
- 894 laboratory‑confirmed cases
- 204 associated deaths
- An estimated 35,000 potential contacts traced in the first month
These figures make the 2024 outbreak roughly three times larger than the Ugandan Ebola episode of 2000 when measured by case count at comparable time points.
Conservation Action: Protecting Gorillas While Sustaining Livelihoods
Recognising the dual threat to wildlife and local economies, the Uganda Wildlife Authority (UWA) partnered with the NGO Conservation Through Public Health (CTPH) to deploy preventive equipment.
Equipment Provided by CTPH
- 25 non‑contact infrared thermometers – for rapid temperature screening of staff, guides, and visitors
- 450 sets of rain gear – to keep rangers and guides dry and comfortable during forest patrols
- More than 30 smartphones – enabling real‑time data collection, symptom reporting, and communication with health authorities
James Musinguzi, Chief Executive of UWA, emphasized that the tools will allow health monitoring of both animals and tourists without requiring direct contact, thereby reducing the risk of virus transmission while keeping gorilla trekking viable.
The Tourism‑Conservation Balance
Tourism revenue is a cornerstone of gorilla conservation in Uganda. Visitor fees fund anti‑poaching patrols, community outreach, and habitat management. When tourism halted for six months during the COVID‑19 pandemic, poaching incidents rose sharply; a notable loss was the silverback Rafiki of the Nkuringo group.
Gladys Kalema‑Zikusoka, veterinarian and founder of CTPH, warns that suspending gorilla visits again could push local communities back toward illegal hunting, undermining years of conservation gains. She stresses that maintaining controlled, health‑screened tourism is essential to keep gorillas “more valuable alive than dead.”
Looking Forward: Integrated Health Strategies
Experts agree that a One Health approach—linking human, animal, and environmental health—offers the best defense against zoonotic spillover. Continued investment in:
- Routine health surveillance of gorilla populations (fecal sampling, thermal checks)
- Rapid response teams capable of isolating suspected cases in both humans and wildlife
- Community education programs that highlight the risks of bushmeat handling and the benefits of wildlife‑based economies
will help safeguard mountain gorillas not only from Ebola but also from other emerging pathogens.
By aligning scientific expertise, local authority leadership, and community livelihoods, Uganda aims to turn the current health challenge into an opportunity to strengthen the resilience of both its people and its iconic mountain gorillas.
