The US Centers for Disease Control and Prevention is sending personnel to Africa to help stop outbreaks of Marburg virus disease and is urging travelers to certain countries to take precautions. The CDC is also taking steps to keep infections from spreading to the United States.

Equatorial Guinea and Tanzania are facing their first known outbreaks of Marburg virus, a viral fever with uncontrolled bleeding that’s a close cousin to Ebola. This week, the CDC urged travelers to both countries to avoid contact with sick people and to watch for symptoms for three weeks after leaving the area. Travelers to Equatorial Guinea should take enhanced precautions and avoid nonessential travel to the provinces where the outbreak is ongoing, the agency said.