The victims died May 18 but test results confirming Ebola only came back over the weekend, according to Congolese Health Minister Dr. Eteni Longondo.
The Ebola epidemic in the country's east has killed 2,280 people since August 2018, and officials had hoped to be able to proclaim it over on June 25.
COVID-19 already has touched 7 of Congo's 25 provinces, with more than 3,000 confirmed cases and 72 deaths.
However, like many African countries Congo has conducted extremely limited testing, and observers fear the true toll may be far higher.
WHO said there have been 369,520 measles cases and 6,779 deaths since 2019.