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Reil I, Duvnjak S, Špičić S, Kompes G, Bagarić A, Đuras M, Gudan Kurilj A, Lukač M, Jelić M, Zdelar-Tuk M. Isolation of Multidrug-Resistant Mycobacterium Avium Subsp. Avium from a Wild Eurasian Otter (Lutra Lutra). Antibiotics (Basel) 2024; 13:591. [PMID: 39061273 PMCID: PMC11273438 DOI: 10.3390/antibiotics13070591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2024] [Revised: 06/21/2024] [Accepted: 06/24/2024] [Indexed: 07/28/2024] Open
Abstract
Mycobacterium avium subsp. avium is pathogenic mainly to birds, although cases of mycobacteriosis caused by these bacteria have also been reported in other animals and humans. Not much is known about the effects of this pathogen on otters. The aim of this study was to report for the first time the isolation of M. avium subsp. avium in wild otter and to describe its multidrug resistance profile. A female otter injured in a car accident was found dead and subjected to postmortem examination. Apart from the trauma changes, no other macroscopic pathological changes were detected. Bacteriologic examination revealed the presence of acid-fast bacilli in the lymph nodes, which were confirmed by molecular methods as M. avium subsp. avium. Antimicrobial susceptibility testing revealed susceptibility to clarithromycin and amikacin, but resistance to linezolid, moxifloxacin, streptomycin, isoniazid, trimethoprim/sulfamethoxazole, ciprofloxacin, doxycycline, and ethionamide. This is unusual for wild species, which generally should not come into contact with antimicrobials, and may suggest that multidrug-resistant MAC strains are circulating between wild and domestic animals. These results emphasise the need for additional epidemiological studies on non-tuberculous mycobacteria in wildlife and their implications for one health.
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Affiliation(s)
- Irena Reil
- Croatian Veterinary Institute, Savska Cesta 143, 10000 Zagreb, Croatia; (I.R.); (S.Š.); (G.K.); (A.B.); (M.Z.-T.)
| | - Sanja Duvnjak
- Croatian Veterinary Institute, Savska Cesta 143, 10000 Zagreb, Croatia; (I.R.); (S.Š.); (G.K.); (A.B.); (M.Z.-T.)
| | - Silvio Špičić
- Croatian Veterinary Institute, Savska Cesta 143, 10000 Zagreb, Croatia; (I.R.); (S.Š.); (G.K.); (A.B.); (M.Z.-T.)
| | - Gordan Kompes
- Croatian Veterinary Institute, Savska Cesta 143, 10000 Zagreb, Croatia; (I.R.); (S.Š.); (G.K.); (A.B.); (M.Z.-T.)
| | - Antonela Bagarić
- Croatian Veterinary Institute, Savska Cesta 143, 10000 Zagreb, Croatia; (I.R.); (S.Š.); (G.K.); (A.B.); (M.Z.-T.)
| | - Martina Đuras
- Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, 10000 Zagreb, Croatia; (M.Đ.); (A.G.K.); (M.L.)
| | - Andrea Gudan Kurilj
- Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, 10000 Zagreb, Croatia; (M.Đ.); (A.G.K.); (M.L.)
| | - Maja Lukač
- Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, 10000 Zagreb, Croatia; (M.Đ.); (A.G.K.); (M.L.)
| | - Mišel Jelić
- Varaždin City Museum, Department of Natural Sciences, Šetalište Josipa Jurja Strossmayera 1, 42000 Varaždin, Croatia;
| | - Maja Zdelar-Tuk
- Croatian Veterinary Institute, Savska Cesta 143, 10000 Zagreb, Croatia; (I.R.); (S.Š.); (G.K.); (A.B.); (M.Z.-T.)
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Kelley M, Sasaninia K, Abnousian A, Badaoui A, Owens J, Beever A, Kachour N, Tiwari RK, Venketaraman V. Additive Effects of Cyclic Peptide [R4W4] When Added Alongside Azithromycin and Rifampicin against Mycobacterium avium Infection. Pathogens 2023; 12:1057. [PMID: 37624017 PMCID: PMC10459066 DOI: 10.3390/pathogens12081057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/29/2023] [Accepted: 08/16/2023] [Indexed: 08/26/2023] Open
Abstract
Mycobacterium avium (M. avium), a type of nontuberculous mycobacteria (NTM), poses a risk for pulmonary infections and disseminated infections in immunocompromised individuals. Conventional treatment consists of a 12-month regimen of the first-line antibiotics rifampicin and azithromycin. However, the treatment duration and low antibiotic tolerability present challenges in the treatment of M. avium infection. Furthermore, the emergence of multidrug-resistant mycobacterium strains prompts a need for novel treatments against M. avium infection. This study aims to test the efficacy of a novel antimicrobial peptide, cyclic [R4W4], alongside the first-line antibiotics azithromycin and rifampicin in reducing M. avium survival. Colony-forming unit (CFU) counts were assessed after treating M. avium cultures with varying concentrations of cyclic [R4W4] alone or in conjunction with azithromycin or rifampicin 3 h and 4 days post-treatment. M. avium growth was significantly reduced 4 days after cyclic [R4W4] single treatment. Additionally, cyclic [R4W4]-azithromycin and cyclic [R4W4]-rifampicin combination treatments at specific concentrations significantly reduced M. avium survival 3 h and 4 days post-treatment compared with single antibiotic treatment alone. These findings demonstrate cyclic [R4W4] as a potent treatment method against M. avium and provide insight into novel therapeutic approaches against mycobacterium infections.
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Affiliation(s)
- Melissa Kelley
- Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, CA 91766, USA
| | - Kayvan Sasaninia
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766, USA; (K.S.); (A.A.); (J.O.)
| | - Arbi Abnousian
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766, USA; (K.S.); (A.A.); (J.O.)
| | - Ali Badaoui
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766, USA; (K.S.); (A.A.); (J.O.)
| | - James Owens
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766, USA; (K.S.); (A.A.); (J.O.)
| | - Abrianna Beever
- College of Osteopathic Medicine, Kansas City University, Kansas City, MO 64106, USA
| | - Nala Kachour
- School of Medicine, University of California Riverside, Riverside, CA 92521, USA;
| | - Rakesh Kumar Tiwari
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766, USA; (K.S.); (A.A.); (J.O.)
- Department of Biomedical and Pharmaceutical Sciences, Center for Targeted Drug Delivery, Chapman University School of Pharmacy, Harry and Diane Rinker Health Science Campus, Irvine, CA 92866, USA
| | - Vishwanath Venketaraman
- College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766, USA; (K.S.); (A.A.); (J.O.)
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Development of Stable Mixed Microbiota for High Yield Power to Methane Conversion. ENERGIES 2021. [DOI: 10.3390/en14217336] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The performance of a mixed microbial community was tested in lab-scale power-to-methane reactors at 55 °C. The main aim was to uncover the responses of the community to starvation and stoichiometric H2/CO2 supply as the sole substrate. Fed-batch reactors were inoculated with the fermentation effluent of a thermophilic biogas plant. Various volumes of pure H2/CO2 gas mixtures were injected into the headspace daily and the process parameters were followed. Gas volumes and composition were measured by gas-chromatography, the headspace was replaced with N2 prior to the daily H2/CO2 injection. Total DNA samples, collected at the beginning and end (day 71), were analyzed by metagenome sequencing. Low levels of H2 triggered immediate CH4 evolution utilizing CO2/HCO3− dissolved in the fermentation effluent. Biomethanation continued when H2/CO2 was supplied. On the contrary, biomethane formation was inhibited at higher initial H2 doses and concomitant acetate formation indicated homoacetogenesis. Biomethane production started upon daily delivery of stoichiometric H2/CO2. The fed-batch operational mode allowed high H2 injection and consumption rates albeit intermittent operation conditions. Methane was enriched up to 95% CH4 content and the H2 consumption rate attained a remarkable 1000 mL·L−1·d−1. The microbial community spontaneously selected the genus Methanothermobacter in the enriched cultures.
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