Louis Pasteur and the Germ Theory. Louis Pasteur how he discovered the germ theory and when. 3.0 / 5 based on 4 ratings ? HistoryMedicine through time (OCR History A)GCSEAll boards Created by: StephanieCreated on: 02-06-11 16:13 What did scientists think about germs? They were caused by disease. 1 of 5 Who made a direct link between germs and disease? Louis Pasteur. 2 of 5 In what year did he prove the germ theory? 1864 3 of 5 How did Pasteur prove the theory? Water in a swan neck flask and an open neck flask. 4 of 5 Who asked Pasteur to see why their beer was going sour in fermentation stage? Monsieur Bigo. 5 of 5
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