Thailand - Geographical disease risk index

Malaria

Risk Category B

Risk Category explanation

A: countries where the malarial risk is present in the whole country all year or with very clear seasonal guidance.

B: countries where only parts of the country are affected.

C: countries where malaria is limited to discrete pockets, where the risk of infection is low, or where there are few visitors to affected areas. It is likely that tourists who visit these countries will be able to donate but individual assessment must be applied. Donors are likely to have detailed knowledge if they have visited any malarial areas. The healthcare professional should establish whether the donor sought advice prior to travel and if they were advised to take antimalarial precautions.

All year in areas along the borders and in inland areas of Surat Thani province – refer to the Malaria Map.

From October 2021, there has been an outbreak of malaria in the Ranong, Songkhla and Trat provinces, including the island of Ko Chang. A risk should also be applied to these areas. Please note, an updated map is not available, therefore these areas are not shown in red on the map below.

Visitors to all other areas including the cities of Bangkok, Chiang Mai, Chiang Rai, Pattaya, Phuket, the island of Ko Samui and the River Quai bridge area, accept.

Previous Malaria risk:

  • Until May 2012:
    All year in whole country.

Search for Malaria guidance

Trypanosoma Cruzi

No Risk

West Nile Virus

No Risk

Viral haemorrhagic fever

No Risk

Tropical viruses

Risk

  • Chikungunya Virus
  • Dengue Virus
  • Zika Virus

Risk applies all year in whole country.

Search for Tropical virus guidance

Malaria Map

A map showing malaria risk areas in Thailand, as described in the page text.

Using the map

This map is only intended as a guide and must always be used in conjunction with the Malaria guidance text above. Sourced from Travax and TravelHealthPro. Please note, the map above may differ from the source version, which may have been updated since publication here.

Reason for change:
Clarification of all-year risk for tropical viruses
Version details:

GDRI Edition 002 Release 54 (19 January 2026)