IMAGE SOURCE,GETTY IMAGESChikungunya virus is transmitted by mosquitoes, most commonly Aedes (Stegomyia) aegypti and Aedes (Stegomyia) albopictusBy Nicholas YongBBC News, Singapore The US Food and Drug Administration has approved the world’s first vaccine for chikungunya, which it sees as an “emerging global health threat”. The mosquito-borne disease causes fever and joint pains and can be...