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[Ultrastructural changes in populations of the pertussis microbe exposed to antibiotics]
Abstract:
The ultrastructural changes in the populations of the pertussis causative agent maintained for a prolonged period of time on nutrient media containing antibiotics were studied with the method of electron microscopy. Significant changes in the ultrastructure of the cells and the population composition due to the effect of tetracycline, levomycetin or erythromycin were observed. The ultrastructure of the populations affected by penicillin or streptomycin and their biological properties were most similar to those of the initial strains. The electronogrammes revealed morphological heterogeneity of the initial and experimental cultures and changes in the subpopulation composition induced by the antibiotics.
Insights
Prolonged antibiotic exposure altered pertussis bacteria structure, with tetracycline, levomycetin, and erythromycin causing significant changes. Penicillin and streptomycin had minimal impact on bacterial ultrastructure and properties.
Area of Science:
- Microbiology
- Bacterial Ultrastructure
- Antibiotic Resistance
Background:
- Pertussis, caused by Bordetella pertussis, remains a significant public health concern.
- Understanding bacterial adaptation to antibiotics is crucial for effective treatment strategies.
Purpose of the Study:
- To investigate the ultrastructural effects of prolonged antibiotic exposure on Bordetella pertussis populations.
- To compare the impact of different antibiotic classes on bacterial morphology and composition.
Main Methods:
- Electron microscopy was employed to examine bacterial cell ultrastructure.
- Bacterial cultures were maintained on nutrient media supplemented with various antibiotics for extended periods.
Main Results:
- Tetracycline, levomycetin, and erythromycin induced significant alterations in bacterial cell ultrastructure and population composition.
- Penicillin and streptomycin exposure resulted in ultrastructural and biological properties closely resembling the original strains.
- Electronograms demonstrated inherent morphological heterogeneity within bacterial populations and antibiotic-induced subpopulation shifts.
Conclusions:
- Different antibiotics exert varying degrees of influence on Bordetella pertussis ultrastructure.
- Antibiotic selection pressure can lead to shifts in bacterial subpopulation dynamics.
- Further research into antibiotic-induced bacterial adaptation is warranted.