Unpasteurized cheese, also known as raw-milk cheese, is made from milk that has not been pasteurized. Pasteurization occurs during cheesemaking when milk is heated at the beginning of the cheesemaking process to destroy microorganisims that can potentially cause sickness or spoilage.
Being stored in brine, Halloumi is quite a salty cheese; if it is too salty for you, simply rinse it under running water before using it. Once opened, Halloumi can be kept in fresh water in the fridge for several days, or it can be frozen for up to 3 months.
Multidose vials have a limit on how long they can be stored after being opened or punctured; typically that limit is around 28 days. Your multidose vial may have an expiration date on the label, but that does not take into consideration the date the vial is first used, which is when the 28-day rule takes effect.