2021 Travel-Associated United States Monkeypox Case

On July 15, 2021, one case of human monkeypox was confirmed in a U.S. resident who traveled from Nigeria to the United States. No additional cases were identified.


This electron microscopic image of a monkeypox virion.

The Centers for Disease Control and Prevention (CDC) and the Texas Department of State Health Services confirmed on July 15, 2021 a case of human monkeypox in a U.S. citizen who traveled from Nigeria to the United States on two commercial flights.

CDC supported state and local health officials to identify more than 200 people who had possible contact with the patient. Because it can take up to 21 days for symptoms to develop after infection, contacts were asked to monitor their health for that amount of time. In early September, 21 days had passed without additional cases identified, and the monitoring period for the remaining contacts ended.

Strong collaboration between CDC, state and local health departments, airline and airport partners, and other stakeholders involved in this investigation helped to prevent additional cases of monkeypox in the U.S. during this period.

For information on identifying, monitoring, and treating patients for monkeypox, please visit the Information for Clinicians page.