Carbapenemase-Producing Organisms (CPO) and Carbapenem-Resistant Organisms (CRO)
DEFINITION:
CRO infections are caused by bacteria resistant to broad-spectrum carbapenem antibiotics (ertapenem, meropenem, imipenem) for any biological reason, making treatment difficult. CPOs are a subset of CROs that achieve resistance by producing a carbapenemase enzyme that directly neutralizes antibiotics. CPOs are highly concerning because:
- Their resistance genes (such as KPC, NDM, OXA-like, VIM and IMP) reside on mobile plasmids, allowing bacteria to share drug resistance.
- They resist almost all other antibiotic classes, including last-resort options, severely limiting available treatment choices.
- CPO infections are linked to high mortality rates and prolonged hospitalizations.
COMMUNITY:
- West Virginia Department of Health - CPO Wallet Card
- Minnesota Department of Health - What is a carbapenemase-producing organism (CPO) and why is it important?
- Utah Department of Health & Human Services’ CPO Guide
- Patient to Physician Letter
- Infection Control at Home
HEALTH CARE PROFESSIONALS:
- When Should Clinical Microbiology Laboratories Perform Carbapenemase Detection Tests?
- The shift from “MIC-Only” back to carbapenemase testing CLSI guidance
- Interim Laboratory Guidance for Colonization Screening for CPOs
- CRO Including CRE Infection Prevention and Control Guidance
- CDC: CRE Carbapenem-resistant Enterobacterales Information for Facilities
- Preventing MDROs: FAQs
- Maine Health Care Association’s CPO Webinar Series
- Pennsylvania Department of Health FAQs: CPOs in LTCs
- WV Prevention and Control of MDRO Strategic Work Plan 2026
LOCAL HEALTH DEPARTMENT:
Case Management
- CPO Case Definition
- CPO Surveillance Protocol *Update pending
- WVEDSS
- Case Report Form
- CRO including CRE Initial Assessment *Update pending
- Investigation FAQ *Update pending
- Guidelines for MDRO Outbreak in Long-term Care Facility
- WV Prevention and Control of MDRO Strategic Work Plan 2026
CRO Including CRE Response and Control Guidance for LHDs and REs
