Honest about the risks, and specific about what prevents each one.
Traffic
CDC names motor vehicle crashes the number one killer of travellers. In Indonesia that mostly means scooters: rented in minutes, ridden in flip-flops, on roads that do not forgive. Grazes are the most common travel injury we see, and the reason tetanus keeps coming up.
Prevention A proper helmet, not the one thrown in with the rental. Check whether your travel insurance actually covers a motorbike — many policies do not, and a medevac is the bill that ends holidays.
Dengue
Present across Indonesia and carried by daytime-biting mosquitoes, so the dusk-and-dawn rule people know from malaria does not apply. The Government of Canada notes there is no vaccine or medication available in Canada to prevent it.
Prevention Repellent through the day, not just the evening. Air-conditioned or screened rooms.
Rabies
Carried by dogs and some wildlife including bats. The temple and forest macaques are the encounter most travellers actually have — a snatched bag, a scratch, a bite that seems minor at the time.
Prevention Do not feed or handle the monkeys, and treat any bite, scratch or lick on broken skin as urgent: wash it for fifteen minutes and get medical advice the same day, vaccinated or not.
Traveller’s diarrhoea
The most likely thing to interrupt your trip, and the least dramatic. Contaminated food, water and ice are the usual routes.
Prevention Bottled or boiled water, ice from places you trust, food cooked fresh and hot. We can send you with rehydration salts and, where it is appropriate, a standby antibiotic.
Zika
Present in Indonesia. Spread mainly by mosquito bite but also sexually, which matters for couples planning a pregnancy as well as for anyone already pregnant.
Prevention If you are pregnant or trying to conceive, this is worth a proper conversation before you book, not after.
Avian influenza
Human cases have been reported in Indonesia. The Government of Canada describes the risk to most travellers as low.
Prevention Avoid live-bird markets and poultry farms; do not touch sick or dead birds.
Volcanic ash
Several Indonesian volcanoes have ongoing activity. Ash disrupts flights and can cause breathing problems — a bigger deal if you have asthma or another lung condition.
Prevention Carry your inhaler in hand luggage, bring spares, and build slack into tight connections.