We have changed our privacy policy. In addition, we use cookies on our website for various purposes. By continuing on our website, you consent to our use of cookies. You can learn about our practices by reading our privacy policy.
Polio patients in iron lungs, 1952; in 1954, Jonas Salk invented a vaccine, virtually eradicated the disease. Rancho Los Amigos Medical Center, Downey, California. Public domain.
Logging out…
Logging out...
You've been inactive for a while, logging you out in a few seconds...