Mountain gorillas share approximately 98% of their DNA with humans, making them exceptionally susceptible to human diseases. The health and medical rules for gorilla trekking in Uganda and Rwanda exist specifically to protect gorillas from respiratory illnesses, bacterial infections, and viruses that could devastate habituated groups with no natural immunity. Understanding these requirements before booking your permits avoids disappointment on the day and ensures the gorillas remain protected. This guide covers all health requirements, the medical conditions that preclude participation, what happens if you feel unwell on trekking day, and the practical health preparation for a gorilla trek.
Minimum Age Requirement
Both Uganda Wildlife Authority and Rwanda Development Board enforce a minimum age of 15 years for all gorilla trekking participants. This rule applies without exceptions — children under 15 will not be permitted to participate regardless of fitness level or family status. The rationale is disease transmission: young children are more likely to carry childhood diseases (measles, mumps, rubella, chicken pox) to which gorillas could be fatally vulnerable. If you are travelling with children under 15 and have purchased gorilla permits, those permits are non-refundable. Confirm the ages of all participants before purchasing permits. Permits are non-transferable.
Illness on Trekking Day: The Rules
Any trekker showing signs of communicable illness on the day of the trek will be refused entry to the forest. The ranger at the briefing station conducts a visual health check. The prohibited symptoms include:
- Cold or flu symptoms (runny nose, sneezing, coughing)
- Diarrhoea or gastrointestinal illness
- Any skin rash or visible skin infection
- Pink eye (conjunctivitis)
- Any other contagious or potentially transmissible condition
- Fever above 37.5°C (rangers may use infrared thermometers in some cases)
This refusal is absolute — if you present any of these symptoms, you will not trek that day regardless of your permit cost. There is no guaranteed refund in this scenario (see cancellation policy guide), though Rwanda Development Board and Uganda Wildlife Authority both have documented cases of permitting rescheduling for genuine illness with medical documentation. If you feel unwell the night before your trek, contact the ranger station or your accommodation’s reception for guidance. Do not attempt to hide symptoms — rangers are experienced at detecting illness and the welfare of the gorillas takes absolute precedence.
Face Mask Requirement
Face masks are mandatory in gorilla forest proximity in both Uganda and Rwanda. This requirement was strengthened following the COVID-19 pandemic but existed in protocol form since the early 2000s due to gorilla respiratory disease vulnerability. You must wear a mask from the point at which the gorillas are located until you exit the forest after the encounter. If you forget your mask, rangers will typically provide a disposable one — but do not rely on this. Bring your own mask (a fitted N95 or medical-grade surgical mask, not a cloth mask) for the trek.
Vaccination Requirements
Yellow fever vaccination is required for entry to both Uganda and Rwanda (presented at border crossing and sometimes at park gates). Gorilla trekking specifically does not have additional vaccination requirements beyond standard tourist entry requirements. However, several vaccinations are strongly recommended by travel medicine physicians for East Africa travel in general:
- Typhoid: Recommended for all East Africa visitors, particularly those eating at local restaurants or camping.
- Hepatitis A: Standard travel vaccination for all African destinations.
- Hepatitis B: Recommended, particularly if any medical procedures might be needed in-country.
- Tetanus/Diphtheria/Pertussis: Standard 10-year booster recommended.
- Rabies pre-exposure: Recommended for visitors who will be in rural areas and potentially encounter wildlife or biting animals.
- Meningitis ACWY: Recommended for Uganda travel specifically.
Physical Fitness Requirements
There is no formal fitness test for gorilla trekking, but certain groups require significant physical effort. The Uganda Wildlife Authority explicitly states that trekking is “strenuous” and “involves walking up steep slopes for several hours in a tropical forest environment.” Realistic fitness preparation:
- Can you walk uphill continuously for 2-3 hours? This is the minimum physical requirement for moderate treks (Buhoma Mubare group, Rwanda Sabyinyo group). Even these “easy” treks involve sustained uphill walking on uneven terrain.
- Can you walk uphill for 4-6 hours with periods of scrambling over roots and through dense vegetation? Required for the more demanding groups (Susa in Rwanda, Nkuringo sector in Uganda, Rushaga deep-forest groups).
- Wheelchair users and visitors with severe mobility limitations: only specific low-elevation, short-trek gorilla groups in Uganda accommodate such visitors — contact Uganda Wildlife Authority directly. Portage (being carried in a stretcher/chair by community porters) has been arranged for some visitors; this must be pre-organised with the relevant sector’s UWA office.
Porter hire is strongly recommended for all trekkers. At USD $15-20, a porter carries your daypack, freeing your hands for balance and camera work on steep terrain. Porters are trained community members who provide income for families adjacent to the forest. The physical benefit to the trekker and the economic benefit to the community make porter hire a straightforward decision.
Altitude Acclimatisation
Bwindi’s trekking areas range from 1,900m to 2,600m above sea level. Volcanoes NP in Rwanda reaches 3,000-3,500m for the higher-elevation groups. If you are arriving from sea level and trekking within 24 hours, mild altitude-related fatigue (reduced stamina, slight headache) is possible but not medically dangerous at these elevations. Acute Mountain Sickness (AMS) becomes a risk above 3,500m — the trekking areas themselves are below this threshold, but the ascent toward the Susa group in Rwanda (reaching 3,000m+) is close enough that visitors with previous altitude sensitivity should be aware. Acetazolamide (Diamox) is sometimes prescribed for altitude acclimatisation — discuss with your travel medicine physician if you have a history of altitude problems.
