Comparison of the Effects of Antibiotic Sensitivity and Physical Parameters on the Growth of <i>Burkholderia cepacia</i> complex and <i>Burkholderia cenocepacia</i>

B<i>urkholderia cepacia</i> complex (Bcc) has been tied to various FDA drug recalls over the past years. It was found that these bacteria can survive on a broad range of molecules in oxygenic and anoxygenic environments as well as sterilized and non-sterilized environments. The main research question focused on how physical requirements and antibiotics can be used to control Bcc and <i>B. cenocepacia </i>growth. Four replicates of TSB tubes that had pH 4, 6, 7, and 8 were inoculated with Bcc and <i>B. cenocepacia</i> and incubated overnight at 4, 20, 25, 37, and 85°C. The transmission readings of the broth cultures were measured to estimate bacterial growth using a Genesys 2 spectrophotometer. The Kirby-Bauer test was performed using Polymyxin, Ticarcillin, Ticarcillin with Clavulanic acid, Penicillin, Ampicillin, Chloramphenicol, Tetracycline, Erythromycin, and Streptomycin. The E-test was performed using gradient strips of Cefiderocol (C) l (0.016-256 mg/L) and Imipenem-relebactam (IR) (0.002/4-32/4 mg/L). The antibiotic dilution test was performed for Chloramphenicol and Tetracycline after observing larger zones of inhibitions with the Kirby-Bauer test. There was no visible growth of Bcc and <i>B cenocepacia</i> at 4°C and 85 °C at any pH and pH 4 across the temperatures. However, subcultures showed bacterial growth the following day. The growth rates increased significantly at 25 and 37°C as well as pH 6 and 7. The average diameters of the zones of inhibitions of PXB, TCC, TIC, C30, and TE30 for Bcc were 1.3, 3.7, 3.1, 2.0, and 1.16 mm and for <i>B. cenocepacia</i> were 0, 1.2, 1.3, 1.1, and 1.6 mm, respectively. Both Bcc and <i>B. cenocepacia</i> were resistant to P10, AM10, E15, and S10. MIC for the E-test of Bcc and <i>B. cenocepacia</i> for IR and C were 0.67 and 10 and 0.88 and 0. 016. mg/L, respectively. MIC and MBC for the dilution test of the C30 and TE30 for Bcc were 1 and 8 and 64 and 128 and <i>B. cenocepacia</i> 8 and 128 and 16 and 128 µg/ml. These bacteria had faster growth rates with no significant difference in their growth under the various temperature and pH conditions used. The research concluded that both Bcc and <i>B. cenocepacia</i> can grow in typical storage conditions such as 4°C and pH 4, without showing any visible signs of growth. This study showed that <i>B. cenocepacia</i> has significantly higher resistance to antibiotics than Bcc. These results are beneficial for developing strategies to prevent <i>Burkholderia</i> cross-contamination in clinical environments.

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Journal
International Journal of Microbiology and Biotechnology
Published
2024-11-12
DOI
https://doi.org/10.11648/j.ijmb.20240904.12
Primary Topic
Cystic Fibrosis Research Advances
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article
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article

Comparison of the Effects of Antibiotic Sensitivity and Physical Parameters on the Growth of <i>Burkholderia cepacia</i> complex and <i>Burkholderia cenocepacia</i>

Kumudini Apsara Munasinghe, Sophia Bishoff, Oghenekome Ukpu, Jesudunsin Dawodu et al.
International Journal of Microbiology and Biotechnology
Cystic Fibrosis Research Advances
article

Comparison of the Effects of Antibiotic Sensitivity and Physical Parameters on the Growth of <i>Burkholderia cepacia</i> complex and <i>Burkholderia cenocepacia</i>

Kumudini Apsara Munasinghe, Sophia Bishoff, Oghenekome Ukpu, Jesudunsin Dawodu, Sheila Bakattah
article en

Abstract

B<i>urkholderia cepacia</i> complex (Bcc) has been tied to various FDA drug recalls over the past years. It was found that these bacteria can survive on a broad range of molecules in oxygenic and anoxygenic environments as well as sterilized and non-sterilized environments. The main research question focused on how physical requirements and antibiotics can be used to control Bcc and <i>B. cenocepacia </i>growth. Four replicates of TSB tubes that had pH 4, 6, 7, and 8 were inoculated with Bcc and <i>B. cenocepacia</i> and incubated overnight at 4, 20, 25, 37, and 85°C. The transmission readings of the broth cultures were measured to estimate bacterial growth using a Genesys 2 spectrophotometer. The Kirby-Bauer test was performed using Polymyxin, Ticarcillin, Ticarcillin with Clavulanic acid, Penicillin, Ampicillin, Chloramphenicol, Tetracycline, Erythromycin, and Streptomycin. The E-test was performed using gradient strips of Cefiderocol (C) l (0.016-256 mg/L) and Imipenem-relebactam (IR) (0.002/4-32/4 mg/L). The antibiotic dilution test was performed for Chloramphenicol and Tetracycline after observing larger zones of inhibitions with the Kirby-Bauer test. There was no visible growth of Bcc and <i>B cenocepacia</i> at 4°C and 85 °C at any pH and pH 4 across the temperatures. However, subcultures showed bacterial growth the following day. The growth rates increased significantly at 25 and 37°C as well as pH 6 and 7. The average diameters of the zones of inhibitions of PXB, TCC, TIC, C30, and TE30 for Bcc were 1.3, 3.7, 3.1, 2.0, and 1.16 mm and for <i>B. cenocepacia</i> were 0, 1.2, 1.3, 1.1, and 1.6 mm, respectively. Both Bcc and <i>B. cenocepacia</i> were resistant to P10, AM10, E15, and S10. MIC for the E-test of Bcc and <i>B. cenocepacia</i> for IR and C were 0.67 and 10 and 0.88 and 0. 016. mg/L, respectively. MIC and MBC for the dilution test of the C30 and TE30 for Bcc were 1 and 8 and 64 and 128 and <i>B. cenocepacia</i> 8 and 128 and 16 and 128 µg/ml. These bacteria had faster growth rates with no significant difference in their growth under the various temperature and pH conditions used. The research concluded that both Bcc and <i>B. cenocepacia</i> can grow in typical storage conditions such as 4°C and pH 4, without showing any visible signs of growth. This study showed that <i>B. cenocepacia</i> has significantly higher resistance to antibiotics than Bcc. These results are beneficial for developing strategies to prevent <i>Burkholderia</i> cross-contamination in clinical environments.

International Journal of Microbiology and BiotechnologyVol. 9(4)
West Virginia University (US), University of North Texas (US), Frostburg State University (US), University of North Texas Health Science Center (US), Georgetown University (US), Baltimore City Community College (US)
Good health and well-being
Openalex Percentile: Top 62%
Cystic Fibrosis Research Advances
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