Infection prevention and control strategies aimed at reducing the occurrence of Carbapenemase-Producing Enterobacteriaceae (CPE) and other antimicrobial-resistant organisms often include advice about screening patients coming from hospitals with a known resistance problem, to prevent introductions into new hospitals by shared patients. We argue that, despite being an efficient method of identifying cases, admission screening for introduction prevention is only effective if the absolute number of imported cases from other hospitals outnumbers the cases coming from the hospital's own patient population, and therefore is only a feasible control strategy during the start of an epidemic. When determining whether import screening is still advisable, we therefore need to be continuously reminded of how Father Ted so eloquently summarised the principles of perspective: "These are small, but the ones out there are far away".
The increasing threat of CPEAn increasing number of control strategies against Carbapenemase-Producing Enterobacteriaceae (CPE) and other antimicrobial-resistant organisms include a focus on coordinating control efforts among hospitals nationally [1] or regionally [2,3]. The need for coordinated control stems from the fact that no single hospital is completely segregated from others: they are all connected by the patients they share, thus creating one large national hospital network. For numerous reasons, some patients need to receive care in different hospitals, for instance because the necessary treatment is not available in the original hospital, or because care can be offered more efficiently elsewhere. These shared patients offer the opportunity for CPE and other organisms to be transmitted from one hospital to another.Patient sharing between hospitals has a strong regional tendency [4], driven by movement patterns to and from large tertiary care centres, such as university hospitals. Often, multiple general hospitals refer patients to the same tertiary care centre for advanced care, connecting all hospitals served by this centre into a single group. These groups tend to fall into clear geographical regions, because referral choice is related to the geographical distance between hospitals. Within these regions, hospitals can quickly share each other's CPE problem(s), with an outbreak in one hospital easily spreading to the others.By coordinating infection prevention and control efforts among hospitals that are easily affected by each other's CPE problems, any outbreak can be approached as a problem of all hospitals combined, avoiding any hospitals being caught off-guard by CPE-positive patients. An example of such a coordinated national response, which included central reporting of detected colonised and infected individuals, contained an outbreak of CPE in Israel after local, single hospital-based interventions had failed [5]. Although the described response was expensive and relied on strict compliance with testing and isolation guidelines in all hospitals, it does show the clear benefit of coo...