Bifidobacteria act as a barrier against infection

October 17, 2000

Bifidobacteria, one of the predominant species which live in the gut, form a barrier against infection, shows research in Gut. But only certain strains are effective. The belief that certain gut bacteria can be beneficial is longstanding, but controversial.

Fourteen strains of bifidobacterium, taken from infant stool samples, were cultured and tested against a wide range of harmful bacteria, including those associated with gut infections.

Two strains, CA1 and F9, decreased the numbers of bacteria, prevented them entering other cells, and killed off a strain of salmonella. The two strains also colonised the intestinal tract of mice, protecting them against lethal infection with salmonella.

How the bifidobacteria develop their "antibiotic" substances is not known, but they are thought to work in concert with the antibiotic proteins and enzymes released by specialised cells in the gut lining, so producing a barrier against infection.

Bifidobacteria are found in breast milk and can be increased by eating more fibre rich foods and "live" yoghurt.

Dr Alain Servin, Faculty of Pharmacy, National Institute of Health and Medical Research, Paris, France.

Bifidobacterium strains from resident infant human gastrointestinal microflora exert antimicrobial activity 2000; 47:646-52

BMJ Specialty Journals

Related Bacteria Articles from Brightsurf:

Siblings can also differ from one another in bacteria
A research team from the University of Tübingen and the German Center for Infection Research (DZIF) is investigating how pathogens influence the immune response of their host with genetic variation.

How bacteria fertilize soya
Soya and clover have their very own fertiliser factories in their roots, where bacteria manufacture ammonium, which is crucial for plant growth.

Bacteria might help other bacteria to tolerate antibiotics better
A new paper by the Dynamical Systems Biology lab at UPF shows that the response by bacteria to antibiotics may depend on other species of bacteria they live with, in such a way that some bacteria may make others more tolerant to antibiotics.

Two-faced bacteria
The gut microbiome, which is a collection of numerous beneficial bacteria species, is key to our overall well-being and good health.

Microcensus in bacteria
Bacillus subtilis can determine proportions of different groups within a mixed population.

Right beneath the skin we all have the same bacteria
In the dermis skin layer, the same bacteria are found across age and gender.

Bacteria must be 'stressed out' to divide
Bacterial cell division is controlled by both enzymatic activity and mechanical forces, which work together to control its timing and location, a new study from EPFL finds.

How bees live with bacteria
More than 90 percent of all bee species are not organized in colonies, but fight their way through life alone.

The bacteria building your baby
Australian researchers have laid to rest a longstanding controversy: is the womb sterile?

Hopping bacteria
Scientists have long known that key models of bacterial movement in real-world conditions are flawed.

Read More: Bacteria News and Bacteria Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to