Learning the lines

摘要

MALARIA KILLED 435,000 people last year, most of them in Africa. The parasite that causes the illness is carried by females of some, but not all, species of mosquitoes of the genus Anopheles. An insect becomes infected by biting an infected human being. Over the course of ten to 12 days, the parasites then multiply inside her. Once this has happened she transmits them with her bite.