Moldy Mozzarella String Cheese : Is Moldy Cheese Okay To Eat Bon Appetit . Cheese is not mold, it is a food made from milk. Bacteria easily spreads through soft, unaged cheeses like cottage cheese and fromage blanc, ricotta, and fresh mozzarella and goat cheeses. No matter how tight the ziplock bag i put the cheese into, some of them (cheddar, mozzarella, blue cheese) still go moldy, why? Normally, a fresh unopened and refrigerated mozzarella cheese will last for about four to six weeks. The traditional string cheese is mozzarella cheese. Visually inspect your mozzarella cheese for signs of mold. It won't taste good and there is a risk that some of the mould that grows on the grated cheese is an inedible variety. Available in packs of 3, 12, 16, 24, 36, 48 and 60. When any of these get moldy, throw them out. Soft cheeses like mozzarella, ricotta, and chèvre are a different matter—they provide an environment that contains more moisture and is much more conducive t