United States of America (USA) - Geographical disease risk index

Malaria

No Risk

Trypanosoma Cruzi

No Risk

West Nile Virus

Risk

All regions of the USA except Hawaii and Alaska.

Donors who have visited between 1 May and 30 November must have the WNV guideline applied.

Search for West Nile Virus guidance

Viral haemorrhagic fever

No Risk

Mosquito-borne viruses

Risk

• Dengue Virus

Risk applies all year in Hawaii.

Risk applies all year in Hillsborough County, Florida. This includes the cities of Tampa and Brandon. There is no risk applied to other regions within Florida.

Search for Mosquito-borne virus guidance

Reason for change:

Dengue Virus risk has been added for Hillsborough County, Florida.

Version details:

GDRI Edition 002 Release 59 (25 September 2026)