Honest about the risks, and specific about what prevents each one.
Altitude illness
The Government of Canada puts the risk from 2,500 m and names Cusco, Puno, Lake Titicaca, Huaraz, Colca Canyon and Ayacucho — warning it can be life-threatening and may require immediate medical evacuation. Risk rises if you ascend quickly, or exercise or drink alcohol before adjusting. Cusco is about 3,400 m and most people fly straight to it from sea level.
Prevention A slow first day, no alcohol on it, and the Sacred Valley before Cusco where the itinerary allows. Altitude medication is prescribable by a pharmacist in Alberta — bring your ascent plan and we will work through it.
Traveller’s diarrhoea
Named by CDC, and the most likely thing to interrupt the trip. Contaminated food, water and ice, and it does not care how good the hotel is.
Prevention Bottled or boiled water including for teeth, ice only where you trust the kitchen, food cooked fresh and hot. Rehydration salts weigh nothing, and we can send you with a standby antibiotic where appropriate.
Roads
The Government of Canada is blunt: mountainous roads are dangerous especially at night, fatal accidents are common, and signage and guardrails are often lacking. It also warns of criminal tactics — objects thrown in front of traffic, nails dispersed on the road. CDC names motor vehicle crashes the number one killer of healthy travellers abroad.
Prevention No overnight mountain drives. Use reputable operators for transfers rather than the cheapest option.
Dengue
The Government of Canada notes dengue is a risk, that it can become severe dengue which is sometimes fatal, and that the mosquitoes bite particularly around sunrise and sunset.
Prevention Repellent through the day, not just at night. Air-conditioned or screened rooms in the lowlands.
Oropouche
Named by both sources. Spread mainly by midges — no-see-ums — rather than mosquitoes, which is why ordinary netting misses it. The Government of Canada flags concerns for pregnant travellers including stillbirth and effects on the baby’s head and brain development.
Prevention Fine-mesh screens or air conditioning in the Amazon. If you are pregnant or planning to be, this is a conversation to have before booking a jungle leg.
Zika
A risk in Peru, spread mainly by mosquito bite and also sexually, and it can cause serious birth defects.
Prevention If you are pregnant or trying to conceive, discuss it before you book rather than after.
Getting treated
The Government of Canada notes care quality varies throughout Peru: private urban hospitals are well staffed and equipped, while public and rural facilities can lack basic resources. Most providers speak only Spanish.
Prevention Travel insurance with medical evacuation — the altitude warning makes that more than a formality. Save the policy number offline and keep a Spanish copy of your medication list.