Healthcare Fight against malaria could be set back 20 years: WHO Updated : April 24, 2020 04:02 PM IST The warning came ahead of World Malaria Day on Saturday. Malaria remains one of the leading killers in low-income countries. Immunisation campaigns to protect children against measles, polio and yellow fever are also affected, and not just in Africa. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.