1955 – Jonas Salk’s Polio Vaccine:

In 1955, Jonas Salk’s inactivated polio vaccine was declared safe and effective, marking a monumental moment in the fight against polio. The vaccine, administered through injections, provided immunity against the poliovirus and was a crucial step in the effort to curb the devastating effects of the disease. The successful rollout of the vaccine contributed significantly to the reduction of polio cases globally, eventually leading to the near-eradication of the disease in many parts of the world.