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Probiotic strains CBA-L74 and SS-K12 significantly reduce acute otitis media incidence in childrenSpecific probiotic strains may lower risk of ear infections in children

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Key Takeaway
Consider CBA-L74 or multi-strain probiotics to reduce AOM incidence and antibiotic use in pediatric patients.

This network meta-analysis synthesized data from 18 randomized controlled trials involving 4,462 children aged 0 to 18 years to evaluate various probiotic strains for the prevention of acute otitis media (AOM). The analysis provides a specific evidence base for strain selection in pediatric populations.

Key findings indicate that CBA-L74 significantly reduced AOM incidence compared to placebo (OR 0.27; 95% CI: 0.11 to 0.68) and remained robustly effective after excluding high risk-of-bias trials (OR 0.28; 95% CI: 0.14 to 0.56). The SS-K12 strain also showed a significant reduction in AOM incidence (OR 0.44; 95% CI: 0.20 to 0.94), though its effect was attenuated and lost significance in sensitivity analyses excluding high risk-of-bias trials.

Regarding secondary outcomes, multi-strain and LGG probiotics significantly reduced antibiotic prescription rates compared to placebo. While no intervention significantly reduced tympanostomy tube placement rates, the multi-strain group showed the most favorable numerical trend (SUCRA 93.2%). CBA-L74 and LGG were associated with reduced acute gastroenteritis incidence. The study highlights that while several strains show promise for AOM prevention, the strength of evidence varies by strain. These findings provide a basis for clinical selection but should be interpreted with caution regarding the specific robustness of certain strains like SS-K12.

How this fits prior evidence

This network meta-analysis addresses a gap in pediatric care by providing the first strain-level evidence to guide probiotic selection for acute otitis media prevention. It builds upon existing knowledge that RSV infection complicated by acute otitis media occurs in 27.7% of children under 5, highlighting the clinical importance of AOM management in young children.

Parents often worry about their children developing painful middle ear infections, a common condition known as acute otitis media. While these infections are common in kids, finding the right way to prevent them is important for keeping children comfortable and reducing unnecessary medicine.

A large review of 18 trials involving over 4,000 children looked at how different probiotic strains affect ear infections. The study found that certain strains, like CBA-L74, significantly lowered the chance of a child developing an ear infection compared to a placebo. Other strains also showed promise in reducing the number of times children needed antibiotics or had upper respiratory infections.

Not all probiotics performed the same way. While some were effective at lowering infection rates, others lost their statistical significance when researchers looked closer at the quality of the original trials. Additionally, while one multi-strain option showed a positive trend in reducing the need for ear tubes, no treatment significantly lowered those rates. These findings help doctors choose specific strains to better protect children's health.

What this means for you:
Specific probiotic strains like CBA-L74 and certain multi-strains can reduce ear infection risk in children.

Common questions

Which probiotics are most effective for ear infections?

The study found that the CBA-L74 strain significantly reduced the incidence of middle ear infections compared to a placebo. Other strains, such as SS-K12 and LGG, also showed benefits in reducing upper respiratory infections or lowering the rates at which children were prescribed antibiotics.

Can probiotics reduce the need for antibiotics in kids?

Yes, certain types of probiotics can help. The study found that multi-strain and LGG probiotics significantly reduced antibiotic prescription rates compared to a placebo. Specifically, multi-strain options were found to be more effective than the SS-K12 strain at reducing these prescriptions.

Do probiotics help prevent children from needing ear tubes?

The study did not find any probiotic intervention that significantly reduced the rates of tympanostomy tube placement. While a multi-strain option showed a favorable numerical trend, it was not enough to be called a statistically significant reduction.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedJul 2026
View Original Abstract ↓
BackgroundProbiotics are established candidates for preventing acute otitis media (AOM) in children, yet existing meta-analyses treat all probiotic interventions as a single class, precluding strain-specific clinical guidance. This network meta-analysis (NMA) compared the efficacy and safety of individual probiotic strains for pediatric AOM prevention.MethodsWe systematically searched PubMed, Embase, the Cochrane Library, Web of Science, CNKI, WanFang, and CBM from inception to 15 March 2026. Eligible studies were RCTs evaluating probiotic interventions for AOM prevention in children aged 0–18 years. The primary outcome was AOM incidence; secondary outcomes included antibiotic prescription rates, tympanostomy tube placement rates, and adverse events. NMAs were performed using a multivariate random-effects frequentist framework (Stata 17.0). Treatment ranking was estimated using SUCRA values.ResultsEighteen RCTs (reported in 20 publications) enrolling 4,462 children were included, evaluating seven probiotic nodes (SS-K12, SS-24SMB, BB-12, CBA-L74, LGG, Multi-strain, α-Strep) against placebo. For AOM incidence, only CBA-L74 (OR = 0.27, 95% CI: 0.11–0.68; SUCRA = 89.3%) and SS-K12 (OR = 0.44, 95% CI: 0.20–0.94; SUCRA = 71.8%) achieved statistically significant reductions vs. placebo. Sensitivity analyses excluding two high risk-of-bias trials showed that SS-K12's effect was substantially attenuated and lost significance, whereas CBA-L74 remained robustly effective (OR = 0.28, 95% CI: 0.14–0.56). For antibiotic prescription rates, Multi-strain (OR = 0.45; SUCRA = 87.1%) and LGG (OR = 0.69; SUCRA = 65.3%) demonstrated significant reductions; both were superior to SS-K12 in direct pairwise comparisons. No intervention significantly reduced tympanostomy tube placement rates, though Multi-strain showed the most favorable numerical trend (SUCRA = 93.2%). Among exploratory outcomes, SS-K12 and LGG significantly reduced RTI incidence, while CBA-L74 and LGG significantly reduced AGE incidence, with CBA-L74 ranking first for AGE (SUCRA = 95.9%).ConclusionsProbiotic efficacy for AOM prevention is highly strain-specific. CBA-L74 demonstrated the most robust and consistent protection across AOM and gastrointestinal outcomes; Multi-strain combinations and LGG were most effective for antibiotic stewardship. These findings provide the first strain-level evidence base to guide rational probiotic selection in pediatric AOM prevention.Systematic review registrationPROSPERO, https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD420261360351, identifier CRD420261360351.
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