Case Series: Microbacterium aurum Bacteremia in Immunosuppressed Patients—An Emerging Threat

Gerlin Varghese Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

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Deepika Sarawat Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

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Ashima Jamwal Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

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Sangram Singh Patel Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

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Nidhi Tejan Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

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Chinmoy Sahu Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

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ABSTRACT.

Blood stream infection with Microbacterium species in humans is rare and frequently linked to the presence of immunosuppressed conditions such as patients on chemotherapy or corticosteroids. Presence of indwelling catheters is also a potential risk factor for M. aurum infection. No case report has been documented in the literature regarding the pathogenic potential of M. aurum in causing bacteremia. This is the first case series reporting bacteremia by M. aurum describing the risk factors and sensitivity pattern of this pathogen. In this case series, we have described bacteremia caused by M. aurum. The risk factors and sensitivity pattern of this pathogen have also been evaluated. Here, we describe the clinical course and presentation of three patients whose blood culture showed growth of M. aurum. Indwelling venous catheter for hemodialysis or for chemotherapy for the treatment of acute lymphoblastic leukemia was found to be a risk factor in two patients. Rheumatoid arthritis was the underlying condition in the second patient and was started on immunosuppressants. Blood samples were collected during the febrile period. The blood culture samples of all these patients had pure isolates of M. aurum, identified by matrix-assisted laser desorption ionization–time of flight mass spectrometry. All three patients were managed according to the sensitivity reports and were discharged in stable condition.

Author Notes

Authors’ contributions: G. Varghese and D. Sarawat: conceptualization of work, data acquisition. A Jamwal and S. S. Patel: data analysis. N. Tejan: critical revision of the draft for important intellectual content. C. Sahu: final approval of the manuscript for publication.

Authors’ addresses: Gerlin Varghese, Deepika Sarawat, Ashima Jamwal, Sangram Singh Patel, Nidhi Tejan, and Chinmoy Sahu, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India, E-mails: gerlinvarghese20@gmail.com, docdeepika14@gmail.com, ashi.jamwal@gmail.com, sangramresearch968@gmail.com, nidhiresearchsgpgi@gmail.com, and chinmoyresearch@gmail.com.

Address correspondence to Chinmoy Sahu, Department of Microbiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow 226014, India. E-mail: chinmoyresearch@gmail.com
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