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CompletedNCT04756466Updated Oct 21, 2024

Effect of the Consumption of a Lactobacillus Strain on the Incidence of Covid-19 in the Elderly

An interventional study of Placebo and Lactobacillus in SARS CoV-2 Infection and Elderly, sponsored by Biosearch S.A.. Completed at 3 sites in Spain. Open to participants aged 60 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2024-10-21.

Sponsored by Biosearch S.A. · Not applicable, Interventional, and Other

Phase
Not applicable
Study type
Interventional
Enrollment
201
Allocation
Randomized
Ages
60 Years and older
Sex
All
01

Study summary

The objective of this trial is to evaluate the effect of the consumption of a probiotic strain on the incidence and severity of COVID-19 in elderly population living in a nursing home. In addition, it will be evaluated if the probiotic strain have some effect on the immune response generated by the Covid-19 vaccine inthis population.

Read the detailed description

The working hypothesis is that the administration of a Lactobacillus strain improves the immune response in the elderly population, improving the immune response to a possible COVID-19 infection. The strain would act as an adjuvant that contributes to developing an effective response against the virus, and therefore there are fewer infectious symptoms due to this virus or, if it appears, it occurs in a milder way among the subjects who take the probiotic strain. Also,the investigators hypothesizes that the administration of the Lactobacillus may improve the immune response generated by the Covid-19 vaccine in this elderly population.

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Conditions studied

  • SARS CoV-2 Infection
  • Elderly

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Keywords

  • Probiotics
  • COVID19
03

In context

COVID-19

7,640 studies on the registry are indexed under COVID-19; 488 are open to participants now.

This study's enrollment of 201 is above the median of 100 across 4,099 interventional studies indexed under COVID-19.

Browse COVID-19 studies →

Lead sponsor

Biosearch S.A. is the lead sponsor of 23 studies on the registry; none are open to participants now.

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

04

Who can participate

Ages eligible
60 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  1. Person over 60 years of age.
  2. Intern in residence for the elderly.
  3. Sign informed consent.

Exclusion criteria

Exclusion Criteria:

  1. Person who at some previous time has tested positive for detection of COVID-19 by PCR or serology.
  2. Person who at the time of starting the intervention presents symptoms compatible with COVID-19.
  3. Person with concomitant disease type HIV, transplant, active cancer or other type of active immunosuppression.
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Study design

Phase
Not applicable
Primary purpose
Other
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Quadruple (Participant, Care provider, Investigator, Outcomes assessor)
Enrollment
201 participants (actual)

Study arms

  • Placebo comparator
    Control group

    Control group that will receive a daily placebo capsule consisting of maltodextrin during 3 months

    Dietary Supplement: Placebo

  • Experimental
    Probiotic group

    Experimental group that will receive one capsule with the probiotic strain per day (3x10 9 CFU / day) during 3 months

    Dietary Supplement: Lactobacillus

Interventions

  • Dietary supplementPlacebo

    Each participant will consume 1 capsule per day in one of the main meals without any restriction in the diet or in their life habits

  • Dietary supplementLactobacillus

    Each participant will consume 1 capsule per day in one of the main meals without any restriction in the diet or in their life habits

06

What researchers measure

Primary outcomes

  1. Incidence of SARS CoV-2 infection.

    Incidence of SARS CoV-2 infection confirmed by PCR or antigen test

    Time frame: 3 months

Secondary outcomes

  1. Incidence of hospital admissions caused by SARS-CoV-2 infection .

    Incidence of hospital admissions caused by infection caused by SARS-CoV-2 confirmed by PCR or antigen test

    Time frame: 3 months

  2. Incidence of ICU admissions caused by SARS-CoV-2 infection

    Incidence of ICU admissions caused by infection caused by SARS-CoV-2 confirmed by PCR or antigen test

    Time frame: 3 months

  3. Incidence of pneumonia caused by SARS-CoV-2 infection .

    Incidence of pneumonia caused by infection caused by SARS-CoV-2 confirmed by PCR or antigen test

    Time frame: 3 months

  4. Incidence of need for oxygen support due to SARS-CoV-2 infection..

    Incidence of need for oxygen support due to SARS-CoV-2 infection confirmed by PCR or antigen test.

    Time frame: 3 months

  5. Incidence of gastrointestinal symptoms due to SARS-CoV-2 infection.

    Incidence of gastrointestinal symptoms due to SARS-CoV-2 infection confirmed by PCR or antigen test.

    Time frame: 3 months

  6. Days with body temperature> 37.5ºC.

    In case of SARS-CoV-2 infection confirmed by PCR or antigen test, Days with body temperature\> 37.5ºC

    Time frame: 3 months

  7. Days of persistent cough.

    In case of SARS-CoV-2 infection confirmed by PCR or antigen test, Days with persistent cough

    Time frame: 3 months

  8. Days of persistent feeling of fatigue.

    In case of SARS-CoV-2 infection confirmed by PCR or antigen test, Days of persistent feeling of fatigue.

    Time frame: 3 months

  9. Use of pharmacological treatments.

    In case of SARS-CoV-2 infection confirmed by PCR or antigen test, use of pharmacological treatments

    Time frame: 3 months

  10. Serum levels of IgG antibody against SARS-CoV-2

    In case volunteers was vaccinated against SARS-CoV-2, the serum levels of IgG antibody against SARS-CoV-2 will be measured, at 6 weeks from the second dose of the vaccine

    Time frame: 6-weeks from second dose of the vaccine

  11. Serum levels of IgA antibody against SARS-CoV-2

    In case volunteers was vaccinated against SARS-CoV-2, the serum levels of IgA antibody against SARS-CoV-2 will be measured, at 6 weeks from the second dose of the vaccine

    Time frame: 6-weeks from second dose of the vaccine

07

Study locations

3 sites
  • Residencia San Marcos
    Santiago De Compostela, A Coruña 15820, Spain
  • Residencia Santa Olalla
    Santiago De Compostela, A Coruña 15881, Spain
  • Residencia San Simon de Ons
    Santiago De Compostela, A Coruña 15883, Spain
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Oct 21, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04756466
Lead sponsor
Biosearch S.A.
Responsible party
Sponsor
First posted
Feb 16, 2021
Start date
Jan 1, 2021
Primary completion
Apr 30, 2021
Completion
Dec 31, 2021
Last update
Oct 21, 2024

Study contacts

Mónica Olivares, PhD
study director · Biosearch S.A.
Anxo Fernandez-Ferreiro, PhD
principal investigator · Complejo Hospitalario Universitario de Santiago Compostela

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Oct 2024. You cannot join it, but the record below documents what was studied.

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