Probiotics in the prevention of eczema: a randomised controlled trial.

OBJECTIVE: To evaluate a multistrain, high-dose probiotic in the prevention of eczema. DESIGN: A randomised, double-blind, placebo-controlled, parallel group trial. SETTINGS: Antenatal clinics, research clinic, children at home. PATIENTS: Pregnant women and their infants. INTERVENTIONS: Women from 36 weeks gestation and their infants to age 6 months received daily either the probiotic (Lactobacillus salivarius CUL61, Lactobacillus paracasei CUL08, Bifidobacterium animalis subspecies lactis CUL34 and Bifidobacterium bifidum CUL20; total of 10(10) organisms/day) or matching placebo. MAIN OUTCOME MEASURE: Diagnosed eczema at age 2 years. Infants were followed up by questionnaire. Clinical examination and skin prick tests to common allergens were done at 6 months and 2 years. RESULTS: The cumulative frequency of diagnosed eczema at 2 years was similar in the probiotic (73/214, 34.1%) and placebo arms (72/222, 32.4%; OR 1.07, 95% CI 0.72 to 1.6). Among the secondary outcomes, the cumulative frequency of skin prick sensitivity at 2 years was reduced in the probiotic (18/171; 10.5%) compared with the placebo arm (32/173; 18.5%; OR 0.52, 95% CI 0.28 to 0.98). The statistically significant differences between the arms were mainly in sensitisation to cow's milk and hen's egg proteins at 6 months. Atopic eczema occurred in 9/171 (5.3%) children in the probiotic arm and 21/173 (12.1%) in the placebo arm (OR 0.40, 95% CI 0.18 to 0.91). CONCLUSIONS: The study did not provide evidence that the probiotic either prevented eczema during the study or reduced its severity. However, the probiotic seemed to prevent atopic sensitisation to common food allergens and so reduce the incidence of atopic eczema in early childhood. TRIAL REGISTRATION NUMBER: ISRCTN26287422.

Dietary supplementation with lactobacilli and bifidobacteria is well tolerated and not associated with adverse events during late pregnancy and early infancy.

Lactic acid bacteria and bifidobacteria are increasingly being administered to pregnant women and infants with the intention of improving health. Although these organisms have a long record of safe use, it is important to identify any adverse effects in potentially vulnerable populations. In a randomized, double-blinded, placebo-controlled trial, we evaluated the safety of a bacterial dietary supplement for the prevention of atopy in infants. Two strains of lactobacilli (Lactobacillus salivarius CUL61 and Lactobacillus paracasei CUL08) and bifidobacteria (Bifidobacterium animalis subsp. lactis CUL34 and Bifidobacterium bifidum CUL20) with a total of 1 x 10(10) colony-forming units were administered daily to women during the last month of pregnancy and to infants aged 0-6 mo. Adverse events (AE) were classified according to WHO International Statistical Classification of Diseases criteria. Common symptoms were recorded by regular questionnaires. Baseline characteristics of 220 mother-infant dyads in the treatment and 234 in the placebo group were similar. Compliance with the trial interventions, loss to follow-up, symptoms, drug usage, infant growth, method of feeding, visits to the doctor, and mothers' assessment of infant health were similar in the 2 groups. Fifteen (6.8%) mothers and 73 (33.2%) infants in the treatment group and 21 (9.0%) mothers and 75 (32.1%) infants in the placebo group reported AE (P = 0.49 and P = 0.84, respectively). Severe AE occurred in 18 mothers and 63 infants with a similar frequency in each group. None of the AE were attributed to the intervention. Our findings support the safe use of this consortium of organisms during pregnancy and early infancy.

Effects of probiotics on the composition of the intestinal microbiota following antibiotic therapy.

The effects of probiotic supplementation on the intestinal re-growth microbiota following antibiotic therapy were studied in a double-blind placebo-controlled study. In the placebo group, numbers of facultative anaerobes and enterobacteria increased significantly, and at day 35 the numbers were significantly higher in the placebo group than in the active group; in the active group, the numbers of bacteroides increased significantly. Although the numbers of enterococci in both groups did not change, in the placebo group the number of patients harbouring antibiotic-resistant enterococci post therapy increased significantly. There was no change in the incidence rate of antibiotic resistance among the patients in the probiotic group.

Effect of probiotics on preventing disruption of the intestinal microflora following antibiotic therapy: a double-blind, placebo-controlled pilot study.

In this pilot-scale, double-blind, placebo-controlled trial, 30 patients with Helicobacter pylori infection were randomised into three groups prior to their 7 days eradication therapy, to study the effects of probiotic supplement comprising Lactobacillus acidophilus and Bifidobacterium bifidum on the intestinal microflora in response to antibiotic therapy. Group I received the placebo product from day 1 to day 15, Group II received placebo from day 1 to day 7 and probiotics from day 8 to day 15 and Group III received probiotics from day 1 to day 15. Patients provided stool samples for analysis on days 1, 7, 12, 17 and 27. For patients in Groups I and II, significant increases in the facultative anaerobe component of the microflora occurred between days 1 and 7. In Group I, the numbers remained elevated to day 27 but in Group II, the numbers decreased significantly between days 7 and 27 back to the starting levels. In Group III, the facultative anaerobe population remained stable throughout. The total anaerobe numbers increased significantly at day 27 than at day 1 for Group I, were unchanged throughout for Group II and decreased significantly for the patients in Group III between days 1 and 7 before reverting to the starting levels by day 27. From these results, it can be seen that probiotic supplementation modulates the response of the intestinal microflora to the effects of antibiotic therapy.