The number of new hospital acquired VRE infections.
The VRE infection rate is calculated as a rate per 1,000 patient days. The total patient days represents the sum of the number of days during which services were provided to all inpatients, over one year of age, during the given time period.
The smaller the facility, the greater the rates will vary — this is because a change in even one case in a small facility will cause the rate to go up or down considerably.