Polio

This was a much-feared disease in the last century. Children were very susceptible to this disease. Poliovirus is highly contagious. 72% of people affected with Polio became crippled for a lifetime. Others showed cold-like symptoms that varied in intensity. The last century saw frequent outbreaks of Polio. However, thankfully we have a successful vaccine to battle it. Many countries ran a campaign that included children getting the vaccine at an early age to prevent Polio. A limited amount of these dosages were enough to build the immune system against the virus. These dosages were oral. The last cases of Polio were seen in Pakistan in 2019. So, these are the deadliest diseases of world history.