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Updated: Dec 18, 2025
Rapid and Specific Detection of Acinetobacter baumannii Infections Using a Recombinase Polymerase Amplification/Cas12a-based System
Published on: April 25, 2025
Unusual community-associated carbapenem-resistant Acinetobacter baumannii infection, Pennsylvania, USA
Mohamed H Yassin1, Tung Phan2, Yohei Doi1
1Division of Infectious Diseases, University of Pittsburgh, Pittsburgh, PA, USA.
Abstract:
We report a rare case of community-acquired pneumonia and bacteremia caused by multidrug resistant Acinetobacter baumannii. The patient was critically ill, intubated for 11 days and subsequently was discharged from the hospital in good condition after 21 days. Whole genome sequencing was performed, and Acinetobacter baumannii isolate belonged to Sequence Type 451, which is prevalent in Asia. The case highlights the blurring margin between healthcare-associated and community-acquired infections.
Insights
A rare case of severe pneumonia and bacteremia caused by multidrug-resistant Acinetobacter baumannii, typically seen in healthcare settings, was reported in the community. This finding suggests a growing overlap between hospital-acquired and community-acquired infections.
Area of Science:
- Infectious Diseases
- Microbiology
- Genomics
Background:
- Community-acquired pneumonia (CAP) and bacteremia are common, but typically not caused by multidrug-resistant (MDR) pathogens.
- Acinetobacter baumannii is a significant opportunistic pathogen, frequently associated with healthcare-associated infections (HAIs).
Observation:
- A critically ill patient presented with community-acquired pneumonia and bacteremia caused by MDR Acinetobacter baumannii.
- The patient required mechanical ventilation for 11 days and was hospitalized for 21 days, eventually recovering.
Findings:
- Whole genome sequencing identified the Acinetobacter baumannii isolate as Sequence Type 451 (ST451).
- ST451 is a globally significant clone, particularly prevalent in Asia, known for its resistance.
- This case represents a rare instance of a highly resistant Acinetobacter baumannii causing severe community-acquired infection.
Implications:
- The findings challenge the traditional distinction between healthcare-associated and community-acquired infections.
- This highlights the increasing threat of MDR pathogens in community settings, necessitating revised diagnostic and treatment strategies.
- Further research into the epidemiology and transmission of MDR Acinetobacter baumannii in the community is warranted.
