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Dr. Salk’s polio vaccine – Mashable

Wednesday, 17 February, 2016

Dr. Salk’s polio vaccine – Mashable

Before the mid-1950s, polio was one of the most feared diseases in the world. Caused by a virus, it created annual epidemics. The disease hit children the hardest. Once contracted, the virus replicates rapidly and invades the nervous system of the victim.

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Source:Dr. Salk's polio vaccine - Mashable

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