The global fight against malaria took a stride forward on Monday as Cameroon started the world's first routine vaccine programme against the mosquito-borne disease, although Reuters journalists witnessed few people in clinics receiving the shot. Around 40 years in the making, the World Health Organization (WHO)-approved RTS,S vaccine developed by British drugmaker GSK is meant to work alongside existing tools such as bed nets to combat malaria, which in Africa kills nearly half a million children under the age of five each year. After successful trials, including in Ghana and Kenya, Cameroon is the first country to administer doses through a routine programme that 19 other countries aim to roll out this year, according to global vaccine alliance Gavi.