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Updated: Aug 15, 2026

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
[Drug resistance of Staphylococcus aureus strains, isolated from children with intestinal dysbacteriosis]
I V Nikolaeva1, V A Anokhin, V M Bondarenko
1State Medical Uneversity, Kazan, Gamaleya Research Institute of Epidemiology and Microbiology, Moscow, Russia.
Abstract:
The level of antibiotic-sensitivity of 73 S. aureus strains isolated from children with dysbacteriosis of the large intestine in an outpatient clinic was determined. The isolation rate of polyresistant strains was 44%. Methicillin-resistant S. aureus (MRSA) were isolated from 25 children (34.2%). 60% of MRSA strains could not be typed with the international set of phages. Among the strains capable of being lyzed by the phages the representatives of phage groups 3 and 4 prevailed. All MRSA strains were sensitive to vancomycin, 84-88% of the strains were sensitive to chloroamphenicol, rifampicin, spiramycin and neomycin, 80% of the strains were sensitive to fusidin and phosphomycin. The level of sensitivity of methicillin-sensitive S. aureus strains (MSSA) to different groups of antistaphylococcal antibiotics was higher. 36-64% of MRSA strains and 21-27% of MSSA strains were resistant to the action of curative bacteriophages. The suppression of obligate microflora was the risk factor in the development of staphylococcal infection of the gastrointestinal tract in children.
Insights
Antibiotic resistance in Staphylococcus aureus strains from children with gut dysbiosis is significant, with many polyresistant and Methicillin-resistant S. aureus (MRSA) strains identified. Gut microflora suppression is a key risk factor for staphylococcal infections.
Area of Science:
- Microbiology
- Clinical Medicine
- Infectious Diseases
Context:
- Investigated antibiotic sensitivity of Staphylococcus aureus in children with large intestine dysbiosis.
- High prevalence of polyresistant (44%) and Methicillin-resistant S. aureus (MRSA) (34.2%) strains observed in an outpatient setting.
Purpose:
- To determine the antibiotic sensitivity profiles of S. aureus strains isolated from pediatric patients with intestinal dysbiosis.
- To assess the susceptibility of MRSA and Methicillin-sensitive S. aureus (MSSA) strains to various antibiotics and bacteriophages.
Summary:
- A significant proportion of S. aureus strains, including MRSA, exhibited polyresistance.
- MRSA strains showed varying susceptibility to antibiotics, with high sensitivity to vancomycin and moderate sensitivity to others. MSSA strains were generally more sensitive.
- Resistance to bacteriophages was noted in both MRSA and MSSA strains, with suppression of gut microflora identified as a risk factor.
Impact:
- Highlights the challenge of treating staphylococcal infections in children with dysbiosis due to antibiotic resistance.
- Informs clinical management strategies by identifying effective antibiotics against prevalent S. aureus strains.
- Underscores the importance of maintaining gut microbiota balance to prevent gastrointestinal staphylococcal infections.
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