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Gram Negative Rod Breast Wound Infections following Post-Cancer Reconstructive Surgery
Poster Title: Gram Negative Rod Breast Wound Infections following Post-Cancer Reconstructive Surgery
Submitted on 22 Feb 2018
Author(s): John Greene, MD, Donna Mae Pate
Affiliations: University of South Florida and H. Lee Moffitt Cancer Center
This poster was presented at USF Health Research Day
Poster Views: 1,388
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Poster Information
Abstract: Patients with breast cancer may be at an increased risk for infection due to their immunosuppression. Anywhere from 2-24% of breast cancer patients suffer from infections caused by microorganisms, usually diagnosed following expander related reconstructive surgery. Tissue expander surgeries may develop complications that can often result in extending antibiotic treatment, increasing the rate of drug related complications, and removal of the implant. Deep wounds in immunocompromised patients are primarily caused by gram-negative bacteria. Evaluating the most common bacterial infections due to GNR etiology, and identifying their susceptibilities may allow clinicians to prevent infections in cancer patients who have received breast reconstructive surgery.
Primary Objectives
Since most available research is focused on evaluating and isolating gram-positive bacteria such as S. Epidermidis and S. aureus, the primary objective of this study is to identify the most common gram-negative bacteria that causes post-surgical infections in patients that have been diagnosed with breast cancer and have had subsequent tissue expander surgery.
Secondary Objectives
Once the most prevalent types of gram negative bacteria have been identified, the secondary objective will allow evaluation of current antimicrobial regimens. This will, in turn, pinpoint both effective and ineffective treatment plans due to resistance and susceptibility changes. Identifying outdated and effective therapy regimens may contribute to lowering the incidence of deep-seated postoperative infections; to determine if the current protocol treatment regimens at Moffitt is concurrent with positive surgical and post-surgical outcomes. This will allow us to objectively assess which antibiotics are both effective and ineffective against current strains of gram-negative bacterial infections.
Source- Site(s) of Infection
Month Collected
Organism- Pathogens from Blood culture

•The top 3 GNR organisms causing breast tissue infections were Pseudomonas aeruginosa (17), Serratia marcescens (6), and Klebsiella pneumoniae (3).
•All Pseudomonas aeruginosa and P. putida isolates were susceptible to all antibiotics tested.
•All Klebsiella isolates were susceptible to all antibiotics tested.
•All Serratia marcescens isolates were resistant to cefazolin and 
•Enterobacteriaceae isolates, specifically E. clocae and E. aerogenes 
showed resistance to cefazolin, and cefoxitin.
•One of the Stenotrophomonas (Xanthomonas) maltophilia isolates 
showed resistance to ceftazidime.
•Morganella morganii showed resistance to ampicillin and cefazolin. It 
also showed intermediate susceptibility to ampicillin/sulbactam and 
•Acinetobacter calcoaceticus/baumannii complex isolates showed 
resistance to ampicillin, cefazolin, and cefoxitin. One isolate showed 
intermediate susceptibility to ceftriaxone.
•The most common antibiotics used to treat GNR breast infections such 
as ciprofloxacin, cefepime, ceftazidime pip/tazo and meropenem 
showed high levels of susceptibility to all the isolates in our sample.
•Empiric antibiotics used to treat post surgical GNR breast wound 
infections should include activity against Pseudomonas aeruginosa, the most common isolate detected which accounted for (17/38) 44.7% of cases. 
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