Honest about the risks, and specific about what prevents each one.
Dengue
Named by both sources. The Government of Canada notes the mosquitoes that carry it typically bite during the daytime, particularly around sunrise and sunset, and that the level of risk changes with season, year, region and elevation. It can lead to severe dengue, which can be fatal.
Prevention There is no vaccine or medication available in Canada to prevent dengue, so repellent is the whole strategy — through the day, reapplied, not just in the evening. Screened or air-conditioned rooms.
Zika
A risk in Belize according to both sources. It is spread by mosquito bite and can also be sexually transmitted, and it can cause serious birth defects.
Prevention Bite avoidance, and condoms or avoiding sexual contact, particularly in pregnancy. If you are pregnant or planning to be, the Government of Canada asks you to discuss the trip with a healthcare provider before you go — and says you may choose to postpone. Worth a conversation before booking rather than after.
Chagas disease and leishmaniasis
Both are on CDC’s Belize list — Chagas from triatomine bugs, leishmaniasis from sand flies. The Government of Canada also lists Chagas for Belize and says the risk is generally low for most travellers, and notes the bugs are active at night.
Prevention Bite avoidance, and a net if you are sleeping in older or poorly sealed rural housing rather than a sealed hotel room.
Leptospirosis
On CDC’s list for Belize. Caught from water, mud or food contaminated with animal urine, including swimming or wading in fresh water and contact with floodwater. Belize’s rainy season runs May to November and the Government of Canada notes bridges often flood severely after a storm.
Prevention Avoid floodwater and muddy water, cover cuts and grazes before going in fresh water, and do not swallow river or cave water. Cave tubing is fresh water.
Hantavirus and tuberculosis
Both appear on CDC’s risk list for Belize — hantavirus from the urine, droppings or saliva of infected rodents, tuberculosis from the air around someone infectious. Neither changes what a typical holiday needs, but the whole list belongs on the page rather than the convenient half of it.
Prevention Avoid rodents and places their waste builds up; avoid close contact with people who are unwell.
Food and water
The reason the first two vaccines on this page are the first two. The Government of Canada’s rule is the old one and still the good one: boil it, cook it, peel it, or leave it. It also asks you not to swallow water when swimming or showering, and to avoid getting fresh water in your eyes, nose or mouth after heavy rain or flooding.
Prevention Bottled or treated water, ice only from safe water, hot food served hot, fruit you peel yourself. Rehydration sachets in the bag — travellers’ diarrhoea is the most common illness travellers get, and fluids are the treatment.
Roads, buses and boats
The Government of Canada says road safety and road conditions are poor throughout the country, accidents are frequent and there is no emergency roadside assistance. Outside the George Price and Philip Goldson highways most roads are unpaved. It lists insufficient lighting, potholes, no guardrails, missing traffic signs, roaming livestock and unmarked speed bumps, and advises avoiding buses and avoiding taxis altogether. CDC names motor vehicle crashes among the main causes of death for travellers.
Prevention No night driving. Water taxis from a reliable operator, not an overcrowded boat. If you would not get into it at home, do not get into it there because you are on holiday.
The sea
The Government of Canada says coastal waters can be dangerous, riptides are common, lifeguard services may not meet Canadian standards and most beaches have no warning flags. Diving, snorkelling and cave tubing all appear on its list of activities that can be dangerous.
Prevention Ask locally which water is safe to swim, stay inside marked areas, never swim alone, and buy insurance that names the activity you booked. Reef shoes for coral, and remember that damaging the reef is a criminal offence in Belize.
New World screwworm
CDC currently notes on its Belize page that cases of New World screwworm myiasis have been reported in countries where it had previously been eliminated, Belize among them. It is a fly whose larvae infest wounds. This is a new note rather than an old risk, and the advice is unglamorous.
Prevention CDC’s advice: avoid bug bites, clean and cover wounds, sleep in a screened room or under a net or in a screened tent, and avoid spending time around livestock.