Thailand has several mosquito-borne infections, and not all of them behave like malaria. Dengue, Zika and chikungunya are spread by mosquitoes that often bite during the day and can be present in towns as well as rural areas. There is no simple tablet that prevents these infections, so repellent, covered skin, screened rooms and sensible accommodation choices matter. Zika is particularly important if you are pregnant, planning pregnancy, or travelling with a partner where pregnancy may be possible. Malaria risk is not the same across Thailand. It is low in rural, forested border areas with Cambodia, Laos and Myanmar, and very low in many other areas. Bangkok, Chiang Mai, Chiang Rai, Koh Phangan, Koh Samui and Pattaya are not considered malaria-risk areas, although bite avoidance still matters. Malaria tablets may be discussed for some higher-risk routes or medical circumstances. Hepatitis A is commonly recommended for previously unvaccinated travellers because it spreads through contaminated food and water. Tetanus should be up to date. Typhoid may be considered for longer stays, rural travel, frequent travel or situations where food hygiene is less reliable. Rabies is present in Thailand. Dogs are the usual concern, but any mammal bite, scratch or lick to broken skin needs urgent advice. Pre-travel rabies vaccination is worth discussing for children, runners, cyclists, long-stay travellers and anyone heading where prompt treatment may be harder to reach. Japanese encephalitis occurs countrywide, with higher relevance for rural exposure, longer stays and northern travel during the May to October season. Hepatitis B may also be relevant, particularly for longer trips, medical or dental treatment abroad, new sexual partners, contact sports or work involving blood exposure.