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Med J Armed Forces India. 2014 Apr;70(2):120-8. doi: 10.1016/j.mjafi.2013.09.005. Epub 2013 Dec 17.

Emerging organisms in a tertiary healthcare set up.

Author information

Resident (Microbiology & Molecular Medicine), Army Hospital (R&R), New Delhi 110010, India.
Professor and Head, Dept of Microbiology, Armed Forces Medical College, Pune 411040, India.
Dy DGMS (Pensions), O/o DGAFMS, 'M' Block, New Delhi 110001, India.
Classified Specialist (Microbiology & Molecular Medicine), Army Hospital (R&R), New Delhi 110010, India.
Professor, Dept of Community Medicine, Armed Forces Medical College, Pune 411040, India.
Senior Adviser and Head (Medicine), 7 Air Force Hospital, Kanpur 208004, India.



One-tenth of all infectious diseases are attributable to emerging organisms. As emerging organisms sporadically affect a relatively small percentage of population they are not studied at large. This study was aimed at studying the characteristics of emerging organisms encountered from various clinical samples in an apex tertiary care multispeciality teaching and research hospital.


16,918 positive isolates obtained from 66,323 culture samples processed in the clinical microbiology lab of an apex multispeciality hospital during 2011-2012 were included after a pilot study. Both manual and automated systems were used for identification and antimicrobial susceptibility. The frequency of isolation, sources, referring centers, resistance and susceptibility profiles, phenotypic characteristics and number of reports in PubMed were studied.


Out of 16,918 isolates, 13,498 (79.78%) were Gram negative bacteria, 3254 (19.23%) were Gram positive bacteria and 166 (0.98%) were yeasts. A total of 483 (2.85%, 95% CI 2.6%-3.1%) emerging organisms including 116 (0.69%, 95% CI 0.57%-0.81%) emerging species were identified comprising 54 genera.


Emerging organisms are likely to evade routine identification or be disregarded as non-contributory. Astute efforts directed at identification of emerging isolates, decisions by clinical microbiologists and treating physicians and containment of infection are required.


Antimicrobial resistance; Automated microbiology systems; Emerging organisms; Microbial identification

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