Ripening of Swiss cheese is done by Propionibacterium/Leuconostoc

Explanation

To determine which bacterium is responsible for the ripening of Swiss cheese, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cheese Types**:
- Swiss cheese is classified as a ripened cheese, which means it undergoes a fermentation process after initial cheese formation.

2. **Formation of Unripened Cheese**:
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