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Status unknownNCT01505361PROBIOPREGUpdated Jan 12, 2012

Study of a Probiotic Strain to Prevent Mastitis and to Eradicate GBS Colonization

A Phase 1/2 interventional study of Lactobacillus salivarius PS2 and Excipient (milk powder) in Mastitis, sponsored by Universidad Complutense de Madrid. Status unknown at 1 site in Spain. Open to female participants aged 25 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2012-01-12.

Sponsored by Universidad Complutense de Madrid · Phase 1/2, Interventional, and Prevention

The sponsor has not verified this record recently (last verified Jan 2012), so the status shown — last known as Recruiting — may be out of date.
Phase
Phase 1/2
Study type
Interventional
Enrollment
100
Allocation
Randomized
Ages
25 Years to 35 Years
Sex
Female
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Study summary

In previous studies, the investigators have seen that carefully-selected Lactobacillus strains are a good alternative to antibiotics for the treatment of lactational mastitis. The objective of this new study is to check if they can also have a preventive role when administered to women with a history of mastitis with one or more previous infants. Since the investigators have also realized that peripartum antibiotherapy (mainly GBS-targeting intrapartum prophylaxis)is a predisposing factor for mastitis (because of the selection of resistant bacteria), the investigators would also like to test if administration of the strains to GBS-colonized pregnant women may lead to GBS eradication. Therefore, a mastitis-predisposing factor would de avoid.

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Conditions studied

  • Mastitis

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Keywords

  • probiotic
  • Lactobacillus salivarius
  • mastitis
  • prevention
  • group B streptococci
  • intrapartum prophylaxis
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In context

Mastitis

31 studies on the registry are indexed under Mastitis; 7 are open to participants now.

This study's planned enrollment of 100 is below the median of 114 across 16 interventional studies indexed under Mastitis.

Browse Mastitis studies →

Lead sponsor

Universidad Complutense de Madrid is the lead sponsor of 206 studies on the registry; 64 are open to participants now.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
25 Years to 35 Years
Sexes eligible
Female
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Normal pregnancy
  • Healthy women
  • Lactational mastitis in, at least, a previous lactation period
  • No symptomatic vaginal infections

Exclusion criteria

Exclusion Criteria:

  • Any kind of health problems related to pregnancy
  • Symptomatic vaginal infections
  • Allergy to cow's milk protein
  • Intolerance to lactose
  • Antibiotic treatment
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Study design

Phase
Phase 1 / Phase 2
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Triple (Participant, Care provider, Investigator)
Enrollment
100 participants (estimated)

Study arms

  • Experimental
    Probiotic

    Pregnant women at 30 week of pregnancy(n=50) receiving Lactobacillus salivarius PS2(9 log per day, until birth)

    Biological: Lactobacillus salivarius PS2

  • Placebo comparator
    Placebo

    Pregnant women at 30 week of pregnancy(n=50) receiving the excipient (once a day, until birth)

    Biological: Excipient (milk powder)

Interventions

  • BiologicalLactobacillus salivarius PS2

    9 log10 (colony-forming units), freeze-dried powder, daily for 30 week of pregnancy until birth

  • BiologicalExcipient (milk powder)

    100 mg/once a day from 30 week of pregnancy until birth

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What researchers measure

Primary outcomes

  1. Evidence of clinical mastitis confirmed by microbiological cultures and somatic cell counts

    Time frame: Weekly during the first 6 months after birth

Secondary outcomes

  1. Evidence of eradication og GBS colonization as confirmed by microbiological analysis of vaginal exudate and rectal swab

    Time frame: At weeks 30, 35, 40 of pregnancy

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Study locations

1 of 1 sites recruiting
  • Public Primary Health Care Centers network
    Madrid, 28040, Spain
    Recruiting
    • Juan M Rodriguez, PhD · Principal investigator
    • Leonides Fernández, PhD · Sub investigator
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References and documents

Publications

  • Arroyo R, Martin V, Maldonado A, Jimenez E, Fernandez L, Rodriguez JM. Treatment of infectious mastitis during lactation: antibiotics versus oral administration of Lactobacilli isolated from breast milk. Clin Infect Dis. 2010 Jun 15;50(12):1551-8. doi: 10.1086/652763. PubMed 20455694 ↗
  • Jimenez E, Fernandez L, Maldonado A, Martin R, Olivares M, Xaus J, Rodriguez JM. Oral administration of Lactobacillus strains isolated from breast milk as an alternative for the treatment of infectious mastitis during lactation. Appl Environ Microbiol. 2008 Aug;74(15):4650-5. doi: 10.1128/AEM.02599-07. Epub 2008 Jun 6. PubMed 18539795 ↗
  • Crepinsek MA, Taylor EA, Michener K, Stewart F. Interventions for preventing mastitis after childbirth. Cochrane Database Syst Rev. 2020 Sep 29;9(9):CD007239. doi: 10.1002/14651858.CD007239.pub4. PubMed 32987448 ↗
  • Fernandez L, Cardenas N, Arroyo R, Manzano S, Jimenez E, Martin V, Rodriguez JM. Prevention of Infectious Mastitis by Oral Administration of Lactobacillus salivarius PS2 During Late Pregnancy. Clin Infect Dis. 2016 Mar 1;62(5):568-573. doi: 10.1093/cid/civ974. Epub 2015 Nov 26. PubMed 26611780 ↗
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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jan 12, 2012, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT01505361
Responsible party
Juan M. Rodríguez (Professor, PhD, Universidad Complutense de Madrid) — Principal investigator
First posted
Jan 6, 2012
Start date
Nov 2011
Primary completion
Mar 2012 (estimated)
Completion
Jun 2012 (estimated)
Last update
Jan 12, 2012

Study contacts

Juan M Rodríguez, PhD
Contact
jmrodrig@vet.ucm.es
34913943837
Juan M Rodriguez, PhD
principal investigator · Complutense University of Madrid, Spain

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is status unknown, as verified in Jan 2012. You cannot join it, but the record below documents what was studied.

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