Journal of Clinical and Diagnostic Research, ISSN - 0973 - 709X

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Thanking you
With sincere regards
Dr. Rajendra Kumar Ghritlaharey, M.S., M. Ch., FAIS
Associate Professor,
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On May 11,2011

Dr. Shankar P.R.

"On looking back through my Gmail archives after being requested by the journal to write a short editorial about my experiences of publishing with the Journal of Clinical and Diagnostic Research (JCDR), I came across an e-mail from Dr. Hemant Jain, Editor, in March 2007, which introduced the new electronic journal. The main features of the journal which were outlined in the e-mail were extensive author support, cash rewards, the peer review process, and other salient features of the journal.
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On April 2011

Dear team JCDR, I would like to thank you for the very professional and polite service provided by everyone at JCDR. While i have been in the field of writing and editing for sometime, this has been my first attempt in publishing a scientific paper.Thank you for hand-holding me through the process.

Dr. Anuradha
On Jan 2020

Important Notice

Case report
Year : 2007 | Month : August | Volume : 1 | Issue : 4 | Page : 293 - 295 Full Version

First Report of Shewanella alga as Emerging Infection in India: Two cases

Published: August 1, 2007 | DOI:

Department of Microbiology, Kasturba Medical College, Manipal – 576104, Karnataka, India.

Correspondence Address :
Dr. Chiranjay Mukhopadhyay. Associate Professor, Department of Microbiology, Kasturba Medical College, Manipal –576104, Karnataka, India. Tel.: 91-820-2571201, extn. 22322; fax: 91-08252-571927; e-mail:


Shewanella alga is a rare isolate from clinical specimens. Repeated isolation of the organism from two cases in elderly non-immunocompromised males, as treated successfully thereafter, confirms the need of utmost microbiological vigilance to identify this unusual pathogen.

In 1985, MacDonell and Colwell proposed the new genus Shewanella, which is composed of three species: S. putrefaciens, S. hanedai and S. benthica (1). Currently, there are at least 22 species in genus Shewanella, most of them being associated with aquatic and marine habitats (2). In 1990, Simidu et al. proposed the name S. alga for a tetrodotoxin-producing isolate recovered from red algae (3). Although there are reports of the isolation of S. putrefaciens from human clinical specimens, it is an uncommon cause of human disease and isolates from clinical specimens usually indicate colonisation (4),(5),(6). Very few reports, on the other hand, are available so far about the isolation of S. alga from the human clinical samples, which has been reported as the predominant human pathogen within the genus (7),(8),(9). In India, there is only one report of the isolation of S. putrefaciens in 1998 (10) and there is no report so far of S. alga from clinical samples in our knowledge. We are reporting two cases where S. alga was isolated: one from peritoneal collection in a case of post-operative peritonitis and the other from sputum of a patient with chronic obstructive pulmonary disease with acute exacerbation.

Case Report

Case 1
A 41-year-old male, cook by profession, non-diabetic and non-hypertensive, presented with vomiting and acute abdominal pain (not related with food intake) with distension. He did not pass any flatus or stool for last 2 days. On physical examination, the patient had central distension, guarding rigidity around umbilicus and diffuse abdominal tenderness. Exploratory laparotomy revealed subacute intestinal obstruction. The patient was having high fever and tenderness along the suture line on third postoperative day, and haematological investigation revealed white blood cell (WBC) count 15,300 percu/ml, haemoglobin 10.1 g/dl and ESR 30 mm (normal 0–10 mm). There was a collection of free fluid in right iliac fossa on CT scan, which was aspirated twice 3 days apart and sent for microbiological culture. Blood was also sent for culture.

Case 2
A 75-year-old male, farmer by occupation, presented with dyspnoea on exertion for last 1 year. There was an acute exacerbation of cough along with copious production of thick sputum, chest pain and fever for last 1 week. The patient was neither hypertensive nor diabetic. On auscultation, basal crepts were noticed. Chest X-ray showed a segmental infiltrate in right lower lobe close to diaphragm, which was consistent with pneumonia. Haematological investigation revealed WBC count of 12,000 percu/ml, haemoglobin level of 12.0 g/dl and ESR was 42 mm. ECG showed type I heart block. Sputum was sent twice for microbiological culture.

The samples (sputum and peritoneal fluid) showed plenty of pus cells and Gram-negative rods on Gram staining. Samples were inoculated onto sheep blood agar and MacConkey agar plates (Hi media, Mumbai, India) and incubated at 37 degreeC in 5% CO2 atmosphere. Another Sheep blood agar was also incubated anaerobically for peritoneal fluid at 37 degreeC, but there was no growth after 48 hours. Fungal and mycobacterial cultures of the samples showed no growth. Blood from the first patient was sterile. Pure growth of small brown moist non-lactose fermenting colonies was observed on MacConkey agar plate (approximately 105 CFU per plate) on second day, which exhibited beta-haemolysis with tan-to-brown pigment on the sheep blood agar (Table/Fig 1). The Gram-negative bacilli were motile, oxidase positive, ornithine decarboxylase and gelatine hydrolysis positive, and grew readily on TSI with heavy blackening of stabbed butt due to H2S production. The bacteria were identified as S. alga since both organisms showed the growth in 6.5% NaCl and at 42C and were beta haemolytic on BA (7),(11). Both the isolates were sensitive to aminoglycosides, quinolones and cephalosporins but showed tolerance to penicillin as tested by Kirby–Bauer method (12).

The first patient was started empirically with cefoperazone–sulbactam (2 g IV q12h) and the second patient with third-generation cephalosporin (ceftriaxone: 2 g once daily IV). Both the patients were switched to oral cephalosporins after the antibiotic sensitivity report, which improved the clinical and radiological (in case of second patient) outcome on follow-up.


Although Pseudomonas aeruginosa is the most common non-fermenter isolated from clinical specimens, Shewanella spp. has recently attracted the attention of the clinical bacteriologists. Recognition of the organism has long been hampered as the isolation of Shewanella spp. has long been considered merely colonisation rather than active infective agent (4),(5). More reports are coming in favour of S. putrefaciens as confirmed by API system, which, however, is unable to differentiate S. alga from S. putrefaciens (8). Our idea to cite these two case reports is to derive more attention for speciation of Shewanella biochemically. This is also imperative because due to immunocompromisation, even rare organisms can cause infection. Moreover, Kim et al. reported evolution of carbapenem resistance in S. alga in recent past (13); so carrying out the antibiogram is equally important. Antibiotic sensitivity pattern on both the occasions showed that these were sensitive strains, although tolerance to penicillin was observed.

Drugs against Pseudomonas spp. (most commonly reported non-fermenter in clinical specimens) are mostly parenteral and relatively costly in comparison to those effective against Shewanella, such as ampicillin, amoxicillin, cotrimoxazole, first- and second-generation cephalosporins and doxycycline. De-escalation of higher antibiotics is also essential if Shewanella is confirmed as the causative agent, since they might give rise to the resistance of the organism.

The isolation of S. alga from above two cases strengthens the assumption that the organism should be regarded as a potential emerging pathogen, which is sensitive so far to most of first- and second-line drugs in this part of the world. Utmost microbiological vigilance to diagnose the unusual pathogen will facilitate the institution of treatment at the earliest, thereby getting satisfactory clinical response.


We acknowledge the sincere effort of our postgraduate students Mr. MuneGowda KC and Ms. Abhipsa Subhadarshini for their help in aboratory diagnosis.


MacDonell MT, Colwell RR. Phylogeny of the Vibrionaecae, and recommendation for two new genera, Listonella and Shewanella. Syst Appl Microbiol 1985;6:171–82.
Winn WC, Allen SD, Janda WM, Koneman EW, Precop GW, Schreckenberger PC. Koneman’s color atlas and textbook of diagnostic microbiology. Chap. 7. 6th ed. New York: Lippincott; 2006. p. 303–91.
Simidu U, Kita-Tsukamoto U, Yasumoto T, Yotsu M. Taxonomy of four marine bacterial strains that produce tetrodotoxin. Int J Syst Bacteriol 1990;40:331–6.
Chen YS, Liu YC, Yen MY, Wang JH, Wang JH, Wann SR, et al. Skin and soft-tissue manifestations of Shewanella putrefaciens infection. Clin Infect Dis 1997;25:225–9.
Brink AJ, van Straten A, van Rensburg AJ. Shewanella (Pseudomonas) putrefaciens bacteremia. Clin Infect Dis 1995;20:1327–32.
Iwata M, Tadeta K, Matsumoto T, Furuya N, Mizuiri S, Yamaguchi K. Primary Shewanella alga septicaemia in a patient on haemodialysis. J Clin Microbiol 1999;37:2104–5.
Nozue H, Hayashi T, Hashimoto Y, Ezaki T, Hamasaki K, Ohwada K, et al. Isolation and characterization of Shewanella alga from human clinical specimens and emendation of the description of S. alga; Simidu et al., 1990, 335. Int J Syst Bacteriol 1992;42:628–34.
Dominguez H, Vogel BF, Gram L, Hoffman S, Schaebel S. Shewanella alga bacteremia in two patients with lower leg ulcers. Clin Infect Dis 1996;22:1036–9.
Botelho-Nevers E, Gouriet F, Rovery C, Paris P, Roux V, Roult D, et al. First case of osteomyelitis due to Shewanella alga. J Clin Microbiol 2005;43:5388–90.
Dhawan B, Chaudhury R, Mishra BM, Aggarwal R. Isolation of Shewanella putrefaciens from a rheumatic heart disease patient with infective endocarditis. J Clin Microbiol 1998;36:2394.
Khase S, Janda JM. Biochemical and pathogenic properties of Shewanella alga and Shewanella putrefaciens. J Clin Microbiol 1998;36:783–7.
Wikler MA, Cockerill FR, Craig WA. Performance standards for antimicrobial susceptibility testing. Fifteenth informal supplement. M100-S15, Vol. 25, No. 1. Wayne, PA: Clinical a

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