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.
Eight more cases have been confirmed, with worries of undetected spread and infections now spanning three provinces that share borders with Cameroon and Gabon.
Since 2021, four African nations have reported their first Marburg virus outbreaks.
The patients are from two villages in the northwestern part of the country.
Two more deaths have occurred in people with symptoms of Marburg, which would raise the outbreak total to 11 cases, all fatal.
The outbreak total remains at 9 cases: 1 confirmed , 4 probable , and 4 suspected.
The teenagers live in the same community that borders Equatorial Guinea, which declared an outbreak yesterday.
At least 9 deaths have been reported, along with 16 suspected cases.