Entertainment World Polio Day 2020: Everything You Need to Know About the Day and Its Importance By Shreya Bhatt - October 24, 2020 0 Share FacebookTwitterPinterestWhatsAppLinkedinReddItTelegramTumblrDiggFlipNaverEmailPrint According to the World Health Organisation, polio cases have decreased by over 99% since 1988, from an estimated 350,000 cases to 22 reported cases in 2017.