Medicine discovery surrounded by 1953?

I need to know a discovery in medicine contained by 1953.

Is Hepatitis A one?
Answers:
Organ Transplant - Johan P.Merril (USA) - 1953

Heart-Lung Machine - Johan Heynsham Gibbon (U.S.) -1953
first thing that came up when i googled "medicine 1953"
http://nobelprize.org/nobel_prizes/medic…

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