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Marcella D. Ridgway, VMD, MS, DACVIM University of Illinois
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You have asked...How useful are probiotics in veterinary practice?The expert says… Many veterinarians currently recommend therapeutic probiotic administration for their small animal patients, particularly for management of acute or chronic diarrhea or as adjunctive therapy for patients on antibiotics. Although few studies have shown probiotic use as beneficial in modifying clinical disease, these benefits are often bacterial-strain and disease specific. Initial investigation of clinical efficacy of probiotic use in disease prevention and treatment in veterinary medicine is promising but preliminary.
Probiotics are live microorganisms which, when administered in adequate amounts, provide health benefits to the recipient. Related terms include prebiotics and synbiotics. A prebiotic is a food substance (eg, inulin) that is not digestible by the host but selectively fermented by gut bacteria to influence the composition or activity of the gut microbiome to favor beneficial bacteria. A synbiotic is a combination of prebiotic(s) and probiotic(s) administered concomitantly.
Related Article: Are Probiotics Reliable?
Although there is not yet strong enough evidence to support specific health claims for probiotics, oral administration of live nonpathogenic organisms can result in improved GI health and immune system function, and growing evidence supports potential therapeutic benefits in diverse disease conditions (eg, chronic GI abnormalities, allergic disease, diabetes mellitus, obesity, liver disease, mood and behavior disorders).1-4 Human and rodent studies have documented gut microbiome alterations and imbalances in various disease conditions, prompting examination of the potential therapeutic benefit of manipulating the GI microbiome by probiotic supplementation.Several human studies have indicated that probiotics may improve glucose tolerance, facilitate weight loss, reduce incidence or severity of atopic dermatitis, benefit patients with liver disease, reduce lipid levels in hypercholesterolemia, reduce inflammation, improve quality of life in humans with inflammatory bowel disease, reduce incidence of some diarrheal diseases, improve outcomes in ICU patients, decrease incidence of respiratory infection in day care (children), and reduce the occurrence of dental caries (children) and severe gingivitis (adults).1-5
Related Article: How to Treat Feline Inflammatory Bowel DiseaseProbiotics have shown benefit in dogs and cats with acute or chronic nonspecific diarrhea and dogs with diet-associated diarrhea.6-10 Probiotic administration may:
However, reduced signs and/or fecal shedding in dogs with giardiasis16 or azotemia in cats with chronic kidney disease17 have not been demonstrated. Probiotic-associated complications have not been reported in small animal patients; safety and ease of administration are additional characteristics which make probiotics appealing therapeutic agents.
For more, see commentary about probiotics from Dr. Colin Burrows.
Probiotics are usually administered in fortified food products or as separate nutritional supplements containing freeze-dried organisms in capsule, tablet, or powder form. Appropriate dosing has not yet been fully evaluated; recommended doses are empirical. Probiotic preparations may contain a single or multiple probiotic species or may be administered in synbiotic form.
The mechanisms by which probiotics generate beneficial effects are largely undetermined. Initially, it was theorized that probiotic strains established themselves in the gut, displacing or inhibiting proliferation of harmful bacteria, which may account for some of the benefits of probiotic use. However, as the extreme complexity of the GI microbiome and its extensive interactions with gut epithelial cells, nervous system components, and immunocytes becomes better understood, a myriad of potential mechanisms becomes apparent.18,19Gut bacteria serve many functions, including food product fermentation, digestion and nutrient absorption, vitamin synthesis, drug metabolism, interaction with cells for gut development and function, and host immune system modulation. Alterations in GI microflora secondary to illness, stress, antibiotic use, and dietary and/or environmental changes can disrupt GI homeostasis (the complex interrelationship of resident GI organisms and normal GI mucosal functions), which has far-reaching effects on host immune system and organ function. Probiotics may benefit affected individuals by acting at one or more points to initiate, enhance, or restore function to evoke a positive health effect.
Because health benefits derived from probiotic administration appear to be highly strain and disease specific, and underlying mechanisms are generally unknown, selecting a potential probiotic strain can be challenging (see Probiotic Candidate Characteristics). Veterinary probiotic research has focused largely on evaluating specific strains for retention of viability and function during product preparation and their ability to transiently colonize the gut. Future research must evaluate particular probiotics for effectiveness in promoting health or modifying various diseases.
Probiotic administration is generally considered safe. Risk for causing harmful infection through administration of live probiotic bacteria is a concern but occurs infrequently in humans; instances of probiotic-associated complications (eg, infection, sepsis) are relatively few and have occurred in individuals with compromised immune systems or with indwelling devices (see Disadvantages & Potential Risks).
Poor quality control is a concern with commercially available products.20,21 Three probiotic supplements for small animals have been appropriately labeled and contained the type and number of organisms claimed (see Products Meeting Label Claims). Some products studied contained no viable organisms. Lack of standardization limits probiotic research and may contribute to inconsistent and discordant results.
Probiotics show considerable promise for disease prevention and treatment. Future evidence-based studies should evaluate appropriate probiotic strains, dosing, and efficacy in diverse veterinary clinical conditions.
MARCELLA D. RIDGWAY, VMD, MS, DACVIM, is clinical associate professor of small animal internal medicine at University of Illinois College of Veterinary Medicine. Her special interests include hepatobiliary and infectious diseases. Dr. Ridgway completed a small animal internship, small animal internal medicine residency, and earned her MS at University of Illinois.
1. Prebiotics and probiotics: Their role in the management of gastrointestinal disorders in adults. Quigley EM. Nutr Clin Pract 27:195-200, 2012.
2. Probiotics in clinical practice: A critical review of the evidence. McNaught CE, MacFie J. Nutr Res 21:343-353, 2001.
3. Probiotics, prebiotics, and synbiotics: Gut and beyond. Vyas U, Ranganathan N. Gastroenterol Res Pract 2012:872716, 2012.
4. Gut microbiota and the role of probiotics in therapy. Quigley EM. Curr Opin Pharmacol 11:593-603, 2011.
5. Probiotics in the intensive care unit. Morrow LE, Gogineni V, Malesker M. Nutr Clin Pract 27:235-241, 2012.
6. Open-label trial of a multi-strain symbiotic in cats with chronic diarrhea. Hart ML, Suchodolski JS, Steiner JM, Webb CB. J Feline Med Surg 14:240-245, 2012.
7. Effect of the probiotic Enterococcus faecium SF68 on presence of diarrhea in cats and dogs housed in an animal shelter. Bybee SN, Scorza AV, Lappin MR. JVIM 25:856-860, 2011.
8. Effects of a probiotic intervention in acute canine gastroenteritis—a controlled clinical trial. Herstad HK, Nesheim BB, L’Abée-Lund T, et al. J Small Anim Pract 51:34-38, 2009.
9. Effects of a probiotic Lactobacillus acidophilus strain on feed tolerance in dogs with non-specific dietary sensitivity. Pascher M, Hellweg P, Khol-Parisini A, Zentek J. Arch Anim Nutr 62:107-116, 2008.
10. Effects of probiotic bacteria in dogs with food responsive diarrhea treated with an elimination diet. Sauter SN, Benyacoub J, Allenspach K, et al. J Anim Physiol Anim Nutr 90:269-277, 2006.
11. Early exposure to probiotics in a canine model of atopic dermatitis has long-term clinical and immunological effects. Marsella R, Santoro D, Ahrens K. Vet Immunol Immunopathol 146:185-189, 2012.
12. Evaluation of Lactobacillus rhamnosus strain GG for the prevention of atopic dermatitis in dogs. Marsella R. Am J Vet Res 70:735-740, 2008.
13. Effect of lactobacillus supplementation on growth and nutrient utilization in mongrel pups. Pasupathy K, Sahoo A, Pathak NN. Arch Tierernahr 55:243-253, 2001.
14. Supplementation of food with Enterococcus faecium (SF68) stimulates immune functions in young dogs. Benyacoub J, Czarnecki-Maulden G, Cavadini C et al. J Nutr 133:1158-1162, 2003.
15. Pilot study to evaluate the effect of oral supplementation of Enterococcus faecium SF68 on cats with latent feline herpesvirus 1. Lappin MR, Veir JK, Satyaraj E, Czarnecki-Maulden G. J Feline Med Surg 11:650-654, 2009.
16. Influence of Enterococcus faecium SF68 probiotic on giardiasis in dogs. Simpson KW, Rishniw M, Bellosa M, et al. JVIM 23:476-481, 2009.
17. Azodyl, a synbiotic, fails to alter azotemia in cats with chronic kidney disease when sprinkled onto food. Rishniw M, Wynn SG. J Feline Med Surg 13:405-409, 2011.
18. Probiotic mechanisms of action. Bermudez-Brito M, Plaza-Diaz J, Muñoz-Quezada S, et al. Ann Nutr Metab 61:160-174, 2012.
19. Therapeutic modulation of microbiota-host metabolic interactions. Holmes E, Kinross J, Gibson GR, et al. Sci Transl Med 4:1-9, 2012.
20. Assessment of commercial probiotic bacterial contents and label accuracy. Weese JS, Martin H. Can Vet J 52:43-46, 2011.
21. Bacteriological evaluation of dog and cat diets that claim to contain probiotics. Weese JS, Arroyo L. Can Vet J 44:212-215, 2003.
Probiotics as tools to improve health: Perspectives for pets. Benyacoub J, Sauter SN, Knorr R, et al. Comp Contin Educ Vet 29:11-19, 2007.
Probiotics in veterinary practice. Wynn SG. JAVMA 234:606-613, 2009.
Current state of knowledge: The canine gastrointestinal microbiome. Hooda S, Minamoto Y, Suchodolski JS, Swanson KS. Anim Health Res Rev 13:78-88, 2012.
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