Some good bacteria are absolutely necessary for overall health and not just bowel health.
In normal good health, some bad bacteria that cause disease are crowded out by good bacteria.
The common principle is there are good bacteria and bad bacteria in the bowel.
An animation--just like the ones in drug ads--shows the good bacteria working in a woman's belly.
Patients who got the good bacteria were more likely to die, according to results published in The Lancet.
Probiotics are dietary supplements or foods that contain the good bacteria similar to those found naturally in the body.
The gut infection Clostridium difficile can be defeated by a cocktail of rival good bacteria, experiments in mice show.
Dutch researchers definitively disproved this in 2008 when they administered massive doses of good bacteria to the intestines of severe pancreatitis sufferers.
This gives good bacteria no opportunity to fight back, which they can do if the environment in the mouth is less made less acidic.
If drug companies made so many claims with so little evidence, "they would be fined, " says Georgetown University physician Daniel Merenstein, who did the study of Lifeway's good bacteria.
The conference also heard that good bacteria growing in dental plaque could help fight off bugs that cause gum disease and tooth decay if they are given a competitive edge.
The children, who were attending daycare, still got sick two or three times a month whether they got the yogurt that was loaded with extra good bacteria or a similar placebo drink.
Changes in the population of bacteria, such as removal of some of the good bacteria or replacement with some bad bacteria, can lead to a variety of health problems, especially inflammation of the bowel, diarrhea and pain.
The 42-year-old secretary and mother of three in Chandler, Arizona, had developed a nasty intestinal infection, the kind that sometimes occurs when antibiotics kill your body's good bacteria along with the bad and lower your defenses to other invaders.
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Sold at high-end U.S. stores like Whole Foods, it comes in flavors like Sublime Slime Lime and contains a hefty dose of 7 billion to 10 billion good bacteria that "inhibit the growth of harmful bacteria" in the gut, according to Lifeway's website.
Professor Philip Marsh, of the Centre for Applied Microbiology and Research, Salisbury, said it should be possible to control the environment in the mouth more effectively to stop the good bacteria being killed off, and to modify the conditions that favour the growth of the harmful organisms.
Emerging basic research suggests that imbalances in good gut bacteria may be involved in obesity, diabetes and other ills.
There is evidence from other studies that good gut bacteria support positive mood too in part because of their effect on the vagus nerve and suggestions that antibiotics dampen this effect.
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Under normal circumstances, the plaque that grows on teeth contains a mix of good and harmful bacteria.
Through this exposure, their own immune systems learn the difference between good and bad bacteria -- i.e. what to fight off and what to use.
Antibiotics are available to treat gum disease, but they work by wiping out all bacteria, good and bad.
The bottom line as of 2001 is that the only sort of life scientists have a good shot at verifying is monocellular bacteria.
Given the increasing numbers of bacteria that are resistant to antibiotics, any progress in ensuring that infections by those bacteria are treatable is good news.
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The intestinal tract is host to a number of microbes, mostly bacteria that are needed for good health.
But when SmithKline researchers screened their compound collection against the novel proteins from staph and strep bacteria, they found few good leads.
Experts believe this variant has acquired a deadly combination of producing a toxin which can damage the kidneys and being really good at sticking to the gut, allowing more bacteria to grow and ultimately produce even more toxin.
No one is sure exactly how infants' immune systems learn to distinguish good bugs from bad, but killing off too many gut bacteria even, apparently, ones that cause illness does appear to disrupt the process.
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