"The world united against malaria : 30c [stamp]: Ethiopia.,https://wellcomecollection.org/works/ukrpyrmv/images?id=r49n58bb, Creative Commons 4.0 International, https://creativecommons.org/licenses/by-nc/4.0/
Malaria "is a life-threatening disease caused by parasites that are transmitted to people through the bites of infected female Anopheles mosquitoes. It is preventable and curable. There are 5 parasite species that cause malaria in humans, and 2 of these species – Plasmodium falciparum and Plasmodium vivax – pose the greatest threat.....In 2019, nearly half of the world's population was at risk of malaria. Most cases and deaths occur in sub-Saharan Africa. However, the WHO regions of South-East Asia, Eastern Mediterranean, Western Pacific, and the Americas also report significant numbers of cases and deaths"
-- World Heath Organization, accessed April 5th, 2021, https://www.who.int/health-topics/malaria#tab=tab_1
Yellow Fever "is an epidemic-prone mosquito-borne vaccine preventable disease that is transmitted to humans by the bites of infected mosquitoes. Yellow fever is caused by an arbovirus (a virus transmitted by vectors such mosquitoes, ticks or other arthropods) transmitted to humans by the bites of infected Aedes and Haemagogus mosquitoes. These day-biting mosquitoes breed around houses (domestic), in forests or jungles (wild), or in both habitats (semi-domestic). Yellow fever is a high-impact high-threat disease, with risk of international spread, which represents a potential threat to global health security."
--World Health Organization, https://www.who.int/health-topics/yellow-fever#tab=tab_1 (accessed April 5th, 2021)