Ms. McNab said that Rwanda had proved that it can suppress measles and identify rubella, and it would benefit from the newer, more expensive vaccine.
The dual vaccine costs twice as much — 52 cents a dose at Unicef prices, compared with 24 cents for measles alone. (The MMR vaccine that American children get, which also contains a vaccine against mumps, costs Unicef $1.)
More than 90 percent of Rwandan children now are vaccinated twice against measles, and cases have been near zero since 2007.
The tiny country, which was convulsed by Hutu-Tutsi genocide in 1994, is now leading the way in Africa in delivering medical care to its citizens, Ms. McNab said. Three years ago, it was the first African country to introduce shots against human papilloma virus, or HPV, which causes cervical cancer.
In wealthy countries, measles kills a small number of children — usually those whose parents decline vaccination. But in poor countries, measles is a major killer of malnourished infants. Around the world, the initiative estimates, about 158,000 children die of it each year, or about 430 a day.
Every year, an estimated 112,000 children, mostly in Africa, South Asia and the Pacific islands, are born with handicaps caused by their mothers’ rubella infection.
Thanks in part to the initiative — which until last year was known just as the Measles Initiative — measles deaths among children have declined 71 percent since 2000. The initiative is a partnership of many health agencies, vaccine companies, donors and others, but is led by the American Red Cross, the United Nations Foundation, the Centers for Disease Control and Prevention, Unicef and the World Health Organization.
An article on Tuesday about a coming measles-rubella vaccination campaign in Rwanda misstated the source of the vaccine and some financing for the campaign. The vaccine and financing are being provided by the GAVI Alliance, not by the Measles and Rubella Initiative.
