An ice making unit and a refrigerator having the same are discussed. The repairing device includes a movement transmitting element, a connecting element mounted on the movement transmitting element, a resilient piece mounted between the movement transmitting element and the connecting element, a carrier element mounted on the connecting element, and a repair element mounted on the carrier element. The sequences of a statistically significant number of the signature tags are determined and the sequences are used to identify and quantify the organisms in the sample. These systems and methods are designed to be employed at the point of care, such as in emergency rooms and operating rooms, or in any situation in which a rapid and accurate result is desired.