Areas at Risk for Chikungunya

Key points

• U.S. travelers can learn which areas have outbreaks or have elevated risk for chikungunya.
• U.S. travelers can use this information on chikungunya risk to help with decisions on vaccination.
• Some U.S. travelers (e.g., pregnant women) can use this information on chikungunya risk to help decide if they should avoid travel.

Background

• Chikungunya cases and outbreaks have been identified in more than 100 countries in the past.
• Chikungunya virus circulates in tropical and subtropical regions.
• Surveillance and laboratory testing practices for chikungunya vary greatly among countries. CDC does not always have information on the current risk in all geographic locations.

Current outbreaks

There is a chikungunya travel health notice for outbreaks in:

• Bolivia (Santa Cruz and Cochabamba Departments)
• Costa Rica (northwest region)
• French Guiana
• Mauritius
• Nicaragua
• Suriname

Vaccine recommendations

Vaccination is recommended for travelers visiting an area with an outbreak. Learn more about available vaccines, recommendations, and considerations.Chikungunya Vaccines

CDC prioritizes posting information on outbreaks that might impact U.S. travelers so they can make informed decisions about their risk of exposure to chikungunya virus.

Many factors are considered before CDC posts outbreak notices, including:

• Evidence of laboratory-confirmed disease among residents or travelers
• The number of people sick with the disease compared with historical levels
• The time of year when the cases are being reported relative to the known mosquito season in a location
• An increase in cases among U.S. travelers
• Geographic extent or size of an outbreak
• Transmission in a new area or an area that has not had disease cases for an extended time, which increases the risk of people getting sick and spreading the virus to uninfected mosquitoes that then bite other people
• Level of concern for U.S. travelers based on the typical volume of U.S. travelers to the destination

Countries with elevated risk for U.S. travelers

U.S. travelers visiting the following countries are at elevated risk* of exposure to chikungunya virus, even if there is no current outbreak:

• Brazil
• Colombia
• India
• Indonesia
• Mexico
• Nigeria
• Pakistan
• Peru
• Philippines
• Thailand

*Countries in this list have had a median of one or more cases reported annually in U.S. travelers during the last 5 years, with at least one case that was laboratory-confirmed.

Vaccine considerations

Vaccination may be considered for travelers visiting or moving to an area without an outbreak but with elevated risk for U.S. travelers if planning to stay for an extended period of time. Learn more about available vaccines and considerations for their use.Chikungunya Vaccines

Cases in the United States

The most recent locally acquired case was reported from a U.S. state in 2025.

On This Page

• Background
• Current outbreaks
• Countries with elevated risk for U.S. travelers
• Cases in the United States

Sept. 3, 2026

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National Center for Emerging and Zoonotic Infectious Diseases (NCEZID)About This Page

Published: May 15, 2024

Updated: September 3, 2026This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.

Reviewed: September 3, 2026The information on this page was last reviewed by subject matter experts to ensure accuracy.

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