Bali is classed as a low malaria risk area, so many short-stay visitors are advised to focus on awareness and bite avoidance rather than routine malaria tablets. That is different from parts of eastern Indonesia, especially Papua, where malaria risk is much higher and tablets are usually advised. If your itinerary includes other islands, say so during the consultation. The mosquito-borne infections that matter more for many Bali trips are dengue and Zika, with chikungunya also recognised in Indonesia. These are spread mainly by mosquitoes that bite in the daytime, including in towns and built-up areas. There is no simple tablet that prevents them. Repellent, loose long sleeves, air-conditioned or screened rooms and taking bites seriously are still useful, even at a smart hotel. Pregnant travellers, and couples planning pregnancy soon after travel, should discuss Zika before booking or travelling. Hepatitis A is commonly recommended for previously unvaccinated travellers because it spreads through contaminated food and water. Typhoid is often considered, particularly for longer stays, frequent travel, children and trips where food hygiene may be less predictable. Tetanus should be current. Hepatitis B, Japanese encephalitis and rabies are discussed for some travellers, especially longer stays, rural time, contact with animals, healthcare work, diving or cycling, and travel where medical treatment may take longer to reach. Dogs, monkeys and bats should not be handled.