The most recently confirmed patients in Marburg virus outbreaks in Equatorial Guinea and Tanzania were discharged from treatment at the end of April, the WHO says.
The latest case raises the country's outbreak total to 9, and the death lifts the fatality count to 6.
The case lifts Equatorial Guinea's number of confirmed infections to 17, which includes 12 deaths.
The outbreak has grown to 16 confirmed cases, 11 of which were fatal, in addition to 23 probable cases, all fatal.
The outbreak has expanded to a fourth province, and epidemiologic links aren't clear for patients in multiple areas—a worrisome sign.
The outbreak has now grown to 15 confirmed infections, 11 of which have proved deadly.
RSV activity began in the southeast and worked its way north and west. In its Marburg notice, the CDC said there is no evidence so far that the two outbreaks are connected.
Officials also reported another death in a confirmed patient, raising the total to 10.
Along with the four new cases, two more deaths were reported in the outbreak that spans a more than 100-mile area, including two cities.
Though no new cases reported in the two outbreaks, groups released new details about the Marburg virus spread in each country.