Condition category
Digestive System
Date applied
Date assigned
Last edited
Prospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status
Results overdue

Plain English Summary

Not provided at time of registration

Trial website

Contact information



Primary contact

Dr Jelena Vulevic


Contact details

Department of Food Biosciences
The University of Reading
United Kingdom

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

A double blind, placebo controlled, randomised, single-centred, parallel group study to determine the potential of a prebiotic to beneficially influence the colonic microflora and immune status of hospitalised elderly patients


Study hypothesis

The metabolic activity of the gastrointestinal environment outstrips that of the liver. This is due to the presence of microorganisms and their continuous interaction with their environment (including other bacteria, gut epithelium, mucosal immune system, central nervous system and the endocrine system). Recent data suggests that intestinal microflora, after 2 years of age, remains relatively constant over time. However, it has been noted that elderly people harbour lower levels of bifidobacteria which may compromise gut health. These changes may be explained in part by the alterations occurring within the body with ageing, such as reduction of gastric, biliary and pancreatic secretions, increased intestinal mucosal permeability, impaired intestinal mobility and immunological changes. Research over the past two decades has provided evidence that administration of probiotics and/or prebiotics could be used to help optimise gut microflora composition, as well as enhance immune function.

Ethics approval

Southampton and South West Hampshire Research Ethics Committee, September 2008, ref: 08/H0504/127

Study design

Interventional double-blind randomised stratified parallel-design trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet


Gut microflora composition and immune function


Patients are randomised to one of two groups (prebiotic/placebo). Patient will be supplemented with the treatment (dosage 5.5 g per day in powder format that can be dissolved in water or juice) for the duration of their hospitalisation and another 7 days after their release from the hospital. On day 1 patient numbers will be assigned and stratified according to reason for hospitalisation. Randomisation table to be obtained from the internet. The total duration of follow up is 2 weeks.

Intervention type



Drug names

Primary outcome measure

To determine the effect of B-GOS on the faecal microflora of hospitalised elderly individuals, using the combination of 5'CY3-labelled 16S-ribosomal RNA oligonucleotide probes and epifluorescent microscopy known as Fluorescent In Situ Hybridisation (FISH). The main groups to be enumerated by this method will be: bifidobacteria, lactobacilli, clostridia, eubacteria, bacteroides and E. coli.

Assessed at the beginning and end of hospitalisation.

Secondary outcome measures

1. To investigate the effect of B-GOS on immunity, as a result of the improvement of the microflora composition, using routine immunological tests as well as cytokine analyses and phagocytosis, analysed in blood samples at the beginning and end of hospitalisation
2. To conduct a daily assessment of stool frequency, stool consistency, bloating, flatulence and abdominal pain, assessed daily based on the hospital records (nurse and doctor visits)
3. To assess the effect of B-GOS on the duration of hospital stay in elderly patients, assessed daily based on the hospital records (nurse and doctor visits)
4. To assess the effect of B-GOS on the incidence and duration of gastrointestinal infections manifest thorough diarrhoea, assessed daily based on the hospital records (nurse and doctor visits)
5. To assess the tolerability and confirm the safety of B-GOS in elderly hospitalised patients, assessed daily based on the hospital records (nurse and doctor visits)

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Inpatients aged 65 or older, either sex
2. Ability to communicate well with the investigator and to comply with the requirements of the entire study
3. Patient has given written informed consent to participate and is willing to participate in the entire study
4. Patient is admitted to the hospital for a minimum of one week

Participant type


Age group




Target number of participants

300 patients

Participant exclusion criteria

1. Patients lacking capacity who are therefore unable to consent
2. Diarrhoea on admission, within the preceding week or reported recurrent diarrhoea
3. Severe allergy or any history of severe abnormal drug reaction, drug or alcohol abuse
4. Intake of more than two courses of antibiotics in the previous four weeks
5. Former participation in another study involving prebiotic or probiotic supplements or investigational drugs within the previous 1 month, or intention to use such drugs during the course of the study
6. Undergone surgical resection of any part of the bowel
7. Currently prescribed immunosuppressive drugs including oral steroids
8. Patients with any heart valve replacement or history of rheumatic heart disease or infective endocarditis
9. Severe life threatening illness

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

The University of Reading
United Kingdom

Sponsor information


Clasado Ltd (UK)

Sponsor details

c/o Dr George Tzortzis
5 Canon Harnett Court
Wolverton Mill
Milton Keynes
MK12 5NF
United Kingdom

Sponsor type




Funder type


Funder name

Clasado Ltd (UK)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

03/05/2016: No publications found, verifying study status with principal investigator.