Cameroon will be the first country to routinely give children a new malaria vaccine as the shots are rolled out in Africa.

The campaign due to start Monday was described by officials as a milestone in the decades-long effort to curb the mosquito-spread disease on the continent, which accounts for 95% of the world’s malaria deaths.

“The vaccination will save lives. It will provide major relief to families and the country’s health system,” said Aurelia Nguyen, chief program officer at the Gavi vaccines alliance, which is helping Cameroon secure the shots.

The Central Africa nation hopes to vaccinate about 250,000 children this year and next year. Gavi said it is working with 20 other African countries to help them get the vaccine and that those countries will hopefully immunize more than 6 million children through 2025.

In Africa, there are about 250 million cases of the parasitic disease each year,