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Screening for bacillus isolates in the broiler gastrointestinal tract
Teresa M Barbosa1, Cláudia R Serra, Roberto M La Ragione
1Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Avenida da República, Apartado 127, 2781-901 Oeiras Codex, Portugal.
Applied and Environmental Microbiology
|February 5, 2005
Summary
Researchers isolated Bacillus species from broiler feces, finding spores tolerant to gut conditions and exhibiting antimicrobial properties. These gut-associated Bacillus isolates show potential as probiotics due to their survival and safety characteristics.
Area of Science:
- Microbiology
- Probiotics
- Gut Microbiome Research
Background:
- Bacillus species spores are used as probiotics, but their gut interaction mechanisms are unclear.
- Understanding gut-associated Bacillus spp. is crucial for developing effective probiotic strategies.
Purpose of the Study:
- To isolate and characterize gut-associated Bacillus species from broiler chickens.
- To evaluate the potential of these isolates as spore-forming probiotics.
Main Methods:
- Isolation of Bacillus spp. from broiler fecal material using heat and ethanol treatment.
- Characterization via morphology, physiology, biochemistry, 16S rRNA sequencing, and plasmid screening.
- Assessment of spore tolerance to simulated gastrointestinal conditions and antimicrobial activity.
Main Results:
- Successfully isolated 237 presumptive Bacillus spp. and characterized 31 representative strains.
- Identified Bacillus subtilis, B. pumilus, B. licheniformis, B. clausii, B. megaterium, B. firmus, and B. cereus group species.
- Demonstrated spore tolerance to simulated gut conditions and broad-spectrum antimicrobial activity against pathogens and spoilage organisms.
- Confirmed isolates' susceptibility to most antibiotics, indicating low risk of horizontal gene transfer.
Conclusions:
- The isolated Bacillus spores exhibit promising characteristics for probiotic applications.
- These spore-forming bacteria demonstrate potential for persistence or transient association within the gut ecosystem.
- Further research into these isolates could lead to novel probiotic formulations for animal and human health.