Evaluation of CHROMagar Acinetobacter for Detection of Enteric Carriage of Multidrug-Resistant Acinetobacter baumannii in Samples from Critically Ill Patients

Background:Acinetobacter baumannii, one of the major causes of nosocomial infections in modern healthcare systems, is characterized by its great persistence in the environment and by its ability to rapidly develop resistance to many antimicrobials. Most A. baumannii infections occur in intubated critically ill patients, causing ventilator-associated pneumonia which is a leading cause of mortality. During the coronavirus disease 19 (COVID-19) pandemic an increase in hospital-acquired carbapenem-resistant A. baumannii (CRAB) infection and colonization in acute-care hospitals has been described. CRAB healthcare-associated infections are often linked to breaches of infection prevention and control (IPC). Beginning in April 2020, our hospital’s IPC unit ordered mandatory universal masking for all healthcare workers (HCWs). Shortages of personal protective equipment during the COVID-19 pandemic led to extended use of surgical face masks by HCWs in our hospital. We investigated whether the extended use of surgical face masks was linked to an increase of CRAB colonization in our intubated critically ill patients. Methods: Surgical masks were collected from doctors, nurses, and housekeeping staff working in 2 internal medicine departments, each including a 4-bed unit for intubated critically ill patients. All surgical masks were worn continuously for 4–5 hours before removal. “Cases“ were defined as HCWs who treated CRAB colonized critically ill patients. “Controls“ were defined as HCWs who did not enter the critically ill patient unit. Surgical masks were incubated with BHI enrichment broth (HyLabs Rehovot, Israel) for 48 hours at 35°C. BHI was seeded on multidrug-resistant (MDR)–selective CHROMagar plates (HyLabs) and incubated overnight at 35°C. Identification was performed using MALDI-ToF mass spectrophotometry (bioMérieux, France). Susceptibility was tested using Vitek 2 (bioMérieux). Results: In total, 55 HCWs participated in the study: 25 cases and 30 controls. Masks from 10 cases (40%) were colonized with Acinetobacter spp versus only 3 masks (10%) from controls (OR, 5.98; 95% CI, 1.42–25; P = .012). Of 13 masks contaminated with Acinetobacter spp, 8 of 10 contaminated masks among cases were colonized with CRAB, whereas only 1 of 3 masks of controls was colonized with CRAB. Conclusions: During the COVID-19 pandemic, extended surgical mask use while treating patients colonized with CRAB increased mask contamination with this bacterium. Surgical masks should be changed after treating a patient colonized with CRAB the same way gown and glove removal and hand hygiene are performed.Funding: NoDisclosures: None

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The lower respiratory tract microbiome of critically ill patients with COVID-19

Scientific Reports ◽

10.1038/s41598-021-89516-6 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Paolo Gaibani ◽

Elisa Viciani ◽

Michele Bartoletti ◽

Russell E. Lewis ◽

Tommaso Tonetti ◽

...

Keyword(s):

Respiratory Tract ◽

Critically Ill ◽

Critically Ill Patients ◽

Lower Respiratory Tract ◽

Multidrug Resistant ◽

Carbapenem Resistant ◽

Lung Microbiome ◽

Bacterial Microbiome ◽

Unweighted Unifrac ◽

Bacterial Superinfection

AbstractCOVID-19 infection may predispose to secondary bacterial infection which is associated with poor clinical outcome especially among critically ill patients. We aimed to characterize the lower respiratory tract bacterial microbiome of COVID-19 critically ill patients in comparison to COVID-19-negative patients. We performed a 16S rRNA profiling on bronchoalveolar lavage (BAL) samples collected between April and May 2020 from 24 COVID-19 critically ill subjects and 24 patients with non-COVID-19 pneumonia. Lung microbiome of critically ill patients with COVID-19 was characterized by a different bacterial diversity (PERMANOVA on weighted and unweighted UniFrac Pr(> F) = 0.001) compared to COVID-19-negative patients with pneumonia. Pseudomonas alcaligenes, Clostridium hiranonis, Acinetobacter schindleri, Sphingobacterium spp., Acinetobacter spp. and Enterobacteriaceae, characterized lung microbiome of COVID-19 critically ill patients (LDA score > 2), while COVID-19-negative patients showed a higher abundance of lung commensal bacteria (Haemophilus influenzae, Veillonella dispar, Granulicatella spp., Porphyromonas spp., and Streptococcus spp.). The incidence rate (IR) of infections during COVID-19 pandemic showed a significant increase of carbapenem-resistant Acinetobacter baumannii (CR-Ab) infection. In conclusion, SARS-CoV-2 infection and antibiotic pressure may predispose critically ill patients to bacterial superinfection due to opportunistic multidrug resistant pathogens.

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Value of American Thoracic Society Guidelines in Predicting Infection or Colonization with Multidrug-Resistant Organisms in Critically Ill Patients

PLoS ONE ◽

10.1371/journal.pone.0089687 ◽

2014 ◽

Vol 9 (3) ◽

pp. e89687 ◽

Cited By ~ 7

Author(s):

Jianfeng Xie ◽

Xudong Ma ◽

Yingzi Huang ◽

Min Mo ◽

Fengmei Guo ◽

...

Keyword(s):

Critically Ill ◽

Critically Ill Patients ◽

Multidrug Resistant ◽

American Thoracic Society ◽

Multidrug Resistant Organisms

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Colonization with Extensively Drug-Resistant Acinetobacter Baumannii and Prognosis in Critically Ill Patients: An Observational Cohort Study

10.21203/rs.3.rs-225795/v1 ◽

2021 ◽

Author(s):

Yue Zheng ◽

Nana Xu ◽

Jiaojiao Pang ◽

Hui Han ◽

Hongna Yang ◽

...

Keyword(s):

Regression Model ◽

Acinetobacter Baumannii ◽

Critically Ill ◽

Critically Ill Patients ◽

Drug Resistant ◽

Short Term ◽

Term Survival ◽

Extensively Drug Resistant ◽

Kaplan Meier

Abstract Background: Acinetobacter baumannii is one of the most often isolated opportunistic pathogens in intensive care units (ICUs). Extensively drug-resistant A. baumannii (XDR-AB) strains lack susceptibility to almost all antibiotics and pose a heavy burden on healthcare institutions. In this study, we evaluated the impact of XDR-AB colonization on both the short-term and long-term survival of critically ill patients.Methods: We prospectively enrolled patients from two adult ICUs in Qilu Hospital of Shandong University from April 2018 through December 2018. Using nasopharyngeal and perirectal swabs, we evaluated the presence of XDR-AB colonization. Participants were followed up for six months. Primary endpoints were 28-day and six-month mortality after ICU admission. For survival analysis, we used the Kaplan-Meier curve. We identified risk factors associated with 28-day and six-month mortality using the logistic regression model and Cox proportional-hazards survival regression model, respectively. Results: Out of 431 patients, 77 were colonized with XDR-AB. Based on the Kaplan-Meier curve results, the survival before 28 days did not differ by colonization status; however, a significant lower survival rate was obtained at six months in colonized patients. Univariate and multivariate results confirmed that XDR-AB colonization was not associated with 28-day mortality, but was an independent risk factor of lower survival days at six months, resulting in a 1.97 times higher risk of death at six months.Conclusions: XDR-AB colonization has no effect on short-term mortality but is associated with lower long-term survival in critically ill patients.

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Colistin-Resistant Acinetobacter Baumannii Bacteremia: A Serious Threat for Critically Ill Patients

Microorganisms ◽

10.3390/microorganisms8020287 ◽

2020 ◽

Vol 8 (2) ◽

pp. 287 ◽

Cited By ~ 4

Author(s):

Georgios Papathanakos ◽

Ioannis Andrianopoulos ◽

Athanasios Papathanasiou ◽

Efthalia Priavali ◽

Despoina Koulenti ◽

...

Keyword(s):

Septic Shock ◽

Acinetobacter Baumannii ◽

Critically Ill ◽

Critically Ill Patients ◽

Clinical Problem ◽

Hospital Infections ◽

Colistin Resistance ◽

Icu Patients ◽

Icu Admission ◽

Comorbidity Index

The prevalence of acinetobacter baumannii (AB) as a cause of hospital infections has been rising. Unfortunately, emerging colistin resistance limits therapeutic options and affects the outcome. The aim of the study was to confirm our clinically-driven hypothesis that intensive care unit (ICU) patients with AB resistant-to-colistin (ABCoR) bloodstream infection (BSI) develop fulminant septic shock and die. We conducted a 28-month retrospective observational study including all patients developing AB infection on ICU admission or during ICU stay. From 622 screened patients, 31 patients with BSI sepsis were identified. Thirteen (41.9%) patients had ABCoR BSI and 18/31 (58.1%) had colistin-susceptible (ABCoS) BSI. All ABCoR BSI patients died; of them, 69% (9/13) presented with fulminant septic shock and died within the first 3 days from its onset. ABCoR BSI patients compared to ABCoS BSI patients had higher mortality (100% vs. 50%, respectively (p = 0.001)), died sooner (p = 0.006), had lower pH (p = 0.004) and higher lactate on ICU admission (p = 0.0001), and had higher APACHE II (p = 0.01) and Charlson Comorbidity Index scores (p = 0.044). In conclusion, we documented that critically ill patients with ABCoR BSI exhibit fulminant septic shock with excessive mortality. Our results highlight the emerging clinical problem of AB colistin resistance among ICU patients.

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