Other contributors have said "What forms the holes in Swiss chees?" is the same question as "WHAT FORMS the holes in Swiss cheese?" If you believe that these are not asking the same thing and should be answered differently, click here
Swiss cheese has holes in it because of bacteria passing gas. Contemplating a typical piece of Swiss cheese, the majority of whose holes, by USDA regulation, must measure between 11/16 and 13/16 of...
The Swiss Cheese Gets Hole through the action of Bacteria. The bacteria give off carbon dioxide which bubbles inside the cheese when forming. This then sets and the bubbles stay there.
A search on "swiss cheese holes" revealed that gassy bacteria are behind all that holey cheese. In order to make cheese, you need the help of bacteria. Starter cultures containing bacteria are added...