Carbapenem-Resistant Organism (CRO) and Carbapenemase-Producing Organism (CPO) Gudiance for Health Care Facilities
Carbapenem-Resistance Organisms
What are Carbapenem-Resistant Organisms (CRO)?
Carbapenem-resistant organisms (CRO) are gram-negative bacteria that are resistant to “last-resort” antibiotics called carbapenems. All organisms have the potential to become resistant, organisms that are currently of most concern include bacteria from the Enterobacterales Order/ Enterobacteriaceae family including E.coli and Klebsiella species. Other organisms that are of high concern include Acinetobacter and Pseudomonas species.
Examples of Carbapenem-resistant organisms include:
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Carbapenem-resistant Entereobacterales (CRE): such as Carbapenem-resistant Klebsiella pneumoniae or Carbapenem-resistant E. coli
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Carbapenem-resistant Acinetobacter baumannii (CRAB)
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Carbapenem-resistant Pseudomonas aeruginosa (CRPA)
CROs limits antibiotic treatment options and can cause serious complications and increased mortality.
CRO Risk and Transmission
Healthy individuals generally do not get CRO infections. However, individuals that have spent time in healthcare or long-term care facilities are at high-risk for becoming colonized or infected.
Risk factors for developing CROs include:
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Being on indwelling medical devices such as medical ventilator, urinary catheters, or endotracheal tubes
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Recent stay at a ventilator-equipped nursing facility or long-term acute care hospital
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Overnight stay at a healthcare facility outside of the United States
CRO are transmitted from person-to-person often through physical contact or medical equipment. Direct person-to-person transmission can occur through contact with an infected persons wounds or stool. Indirect person-to-person contact can occur through contaminated surfaces, as well as contaminated hands or clothing of a healthcare worker. Transmissions can also occur during surgery or through medical treatment devices.
Prevention
Several ways to prevent transmission and infection include:
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Proper hand hygiene practices amongst staff
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Being aware of new patient admits’ CRO status to ensure precautions in place, and utilizing Interfacility Transfer Communication Form to notify admitting facility of status
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Coordinating appropriate health response if identification of a single case occurs
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Utilizing Contact precautions (or enhanced standard precautions for select non-acute care settings) including appropriate use of gowns and gloves upon entry to patients’ rooms and utilizing a private room (or cohorting per the same organism)
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Taking antibiotics accordingly and when appropriate to specific illness
Carbapenemase Producing Organisms
What are Carbapenemase-Producing Organisms (CPO)?
Carbapenemase Producing Organisms (CPO) are a subset of CRO. They produce enzymes known as carbapenemase that inactivate not only carbapenems, but other beta-lactam antibiotics including penicillinsand cephalosporins. It has greater potential for spread and resistance because many carbapenem genes are on mobile genetic elements that can be transmitted across different bacterium types.
The most common carbapenemase in United States is Klebsiella pneumoniae Carbapenemase (KPC).
Other carbapenemase with mobile genetic elements include:
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New Delhi Metallo-beta-lactamase (NDM)
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Verona Integron-Encoded Metallo-beta-lactamase (VIM)
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Imipenemase (IMP)
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Oxacillinase-48 (OXA-48)
CROs and CPOs are becoming more common throughout healthcare facilities in California. Measures such as testing for carbapenemase, and use of infection control practices such as proper hand hygiene and transmission-based precautions are important to prevent further transmission.