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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. ÐÇ¿ÕÓéÀÖ¹ÙÍø does not always have information on the current risk in all geographic locations.

Current outbreaks

There is a for outbreaks in:

• Mauritius
• Mayotte
• Réunion
• Somalia
• Sri Lanka

ÐÇ¿ÕÓéÀÖ¹ÙÍø 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 ÐÇ¿ÕÓéÀÖ¹ÙÍø 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
• Mexico
• Nigeria
• Pakistan
• Philippines
• Thailand

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

Cases in the United States

Locally acquired chikungunya cases have not been reported from U.S. states or territories since 2019.