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Zh Mikrobiol Epidemiol Immunobiol
Vol.1, No., 2012; Page: 3 - 9

[Taxonomic characteristics and mixed communities of wound infection agents in patients of reanimation and surgical departments of a hospital]

Men'shikova ED, Kiselevskaia-Babinina IV, Men'shikov DD, Godkov MA

Abstract

AIM:

Study of taxonomical structure ofwound infection agents, prevalence of mixes, and detection of character of their possible connection with the results of various microorganisms population interaction in septic wounds.

MATERIALS AND METHODS:

A microbiological study of material from patients with wound infection (WI), 582 of those were cured in reanimation and intensive therapy departments (RITD; group 1) and 1455 - in surgical departments (SD; group 2), was performed. Taxonomic membership and ability to coexist was determined in 4129 microorganisms strains. Etiological role of the agents was evaluated by using values of consistency rate (CR). Species that were present in more than 50% of samples were considered consistent, in 25 to 50%--additional, and in less than 25%--random. Frequency rates (FR) were also determined, that is the fraction of a certain species (genus) of the microorganism (in %) from all the isolated cultures that correspond to 100%. For the determination of the significance of individual species of the agent in the structure of mixed microorganism populations, FR - their fraction (%) in mixed population from the number of strains of this species that correspond to 100% - was calculated.

RESULTS:

A significant part of the microorganisms strains, more frequently in reanimation department (65.5%), caused wound suppuration in populations mixed with other species of the agents. In reanimation and surgical departments consistent species of wound infection agents were not detected. A leading etiological role of Staphylococcus aureus (FR 19.2% and 23.9%) was determined, and FR of S. aureus strains in mixes was 64.6% in RITD and 46.8% in SD. The parameters ofotheragents of WI in the comparison groups were similar. However FR among mixes in RITD were significantly higher for streptococci that do not belong to S. pyogenes species (72,5%), and also nonfermentative microorganisms (67,2%), and in SD - in Klebsiella pneumoniae mixes. For agents of wound infection especially in RITD, low species diversity was characteristic and the number of mixes variants is significantly higher. In RITD mixed infections develop more frequently, and the ecological community of microorganisms reaches higher values than in SD.

CONCLUSION:

During the analysis of microbiologi-cal data in RITD and SD general patterns and specific features of taxonomical structure, prevalence of mixed populations and character of their ecological community in wound infection was determined.

Keywords:


 

 
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