⚡World Polio Day 2020 Photos, Slogans, Messages & HD Wallpapers For Free Download Online
By Team Latestly
World Polio Day is observed to mark the birth of Jonas Salk, the inventor of the polio vaccine. As per records, Salk developed the first polio vaccine in the 1950s. He was hailed as a 'miracle worker' for inventing the vaccine.