Polio is a viral infection that has been associated with varying degrees of paralysis. On March 26, 1953, American medical researcher Dr. Jonas Salk announced on a national radio show that he had successfully developed a vaccine against poliomyelitis. For promising eventually to eradicate the disease, which is known
Polio is a viral infection that has been associated with varying degrees of paralysis. On March 26, 1953, American medical researcher Dr. Jonas Salk announced on a national radio show that he had successfully developed a vaccine against poliomyelitis. For promising eventually to eradicate the disease, which is known