If we’ve had vaccines for the polio virus for almost 70 years, why haven’t we been able to fully eradicate it from the globe? Hosted by: Hank Green (he/him)

Las vacunas han supuesto que actualmente existan muy pocos casos nuevos de polio, pero a principios del siglo XX la situación era muy distinta. Aprende cómo dos científicos, Salk y Sabin, casi han erradicado esta enfermedad...

Vaccines mean that there are now very few new polio cases, but in the early 1900s this wasn't the case. Learn how two scientists, Salk and Sabin, virtually wiped out this potentially deadly disease. Biology - Healthy Living - Polio is a...

This dynamic, live-action video will inform students about the vaccines. The program begins with an explanation of the human immune system and how it defends the body from pathogens that cause disease. Viewers will learn the...