Trial to Evaluate Dietary Supplements to Maintain Gut Health During Travel

Probiotics and passive immunoprophylaxis are classes of dietary supplements that are lawfully marketed in the US for maintenance of gut health (GH). This randomized, double-blind, clinical trial will evaluate one commercially available dietary supplement products (passive immunoprophylaxis (Travelan®), compared with placebo, to assess their ability to maintain normal gut function during travel. The results of this clinical trial will be used to evaluate the use of Travelan® to maintain GH during deployment and travel and is not intended to support a marketing application of any dietary supplement as a drug or biological product for human use. This study is a multi-site, randomized, placebo-controlled, double-blind clinical trial conducted on travelers and deployed US and United Kingdom (UK) military personnel. The study will test Travelan®, compared with placebo for maintenance of GH during and immediately after travel. Enrollment of 868 deployed military personnel or travelers will occur at sites within the Uniformed Services University of the Health Sciences (USU) Infectious Disease Clinical Research Program (IDCRP) network and the UK military. Subjects will be randomized to receive a masked regimen of Travelan® or placebo taken as 1 sachet twice daily with meals. Chemoprophylaxis will be started 2 days prior to arrival and maintained for a maximum duration of 20 days (minimum of 10 days) during travel or deployment. Stool smears collected during travel will be used for evaluating the microbiome and for gut pathogen identification. Paired (pre and post-supplement administration) sera and stool samples (pre- and post-supplement administration) will be collected for testing of exploratory objectives. Primary Endpoint (Efficacy): The primary efficacy endpoint is the combined endpoint of incidence of GH disruption (defined as 3 or more unformed stools in a 24-hour period) OR 2 or more unformed stools and one or more associated symptoms (nausea, vomiting, abdominal pain, fever, bloody stool) in a 24-hour period OR antibiotic treatment for diarrhea per subject report, during the period of prophylaxis. Primary endpoint data will be obtained from review of the Travel Diary. Secondary Objectives: Secondary endpoints will include an evaluation of compliance with each dietary supplement and tolerability (e.g. taste, bloating, flatulence, etc.); these will be assessed using the Travel Diary. Differences in GH associated enteropathogen distribution among the 2 treatment groups will be determined by testing stool smears collected by subjects during a GH deficit using a polymerase chain reaction (PCR) assay. Exploratory objectives related to changes in the gut microbiome with dietary supplement use and proteomic signatures of the host-pathogen interaction will be addressed contingent on the availability of additional funding.