A Randomized, Placebo-controlled, Double Blind Volunteer Study Into the Effect of Milk Ingredients on Gastroenteritis Caused by an Attenuated E.Coli.
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 60
- 试验地点
- 2
- 主要终点
- Change of fecal ETEC numbers over time as a marker of intestinal colonization resistance
研究概览
简要总结
Background: The incidence of gastrointestinal infections is very high. In Western countries at least 30% of the population suffers from at least one food-borne infection per year. Mostly because of the problem of antibiotic resistance, more emphasis is put on prevention of infections. One of the possibilities is to strengthen human resistance to gut infections by consumption of milk ingredients.
Aim: To study whether a milk protein concentrate rich in phospholipids improves the resistance of humans to enterotoxigenic E. coli (ETEC).
Study design: The MIRAGE study is a parallel, double-blind, placebo-controlled 4-weeks intervention with a milk protein concentrate rich in phospholipids in healthy subjects of 18-55 yrs of age. Participants will be randomly assigned to the milk protein concentrate rich in phospholipids or placebo group (n=30 per group). Subjects will be instructed to maintain their usual pattern of physical activity and their habitual food intake, but to standardize their dietary calcium intake. After an adaptation period of 2 weeks, subjects will be orally infected with a live, but attenuated, ETEC vaccine (strain E1392-75-2A; collection NIZO food research; dose will be 1010 CFU). Before and after infection, an online diary will be kept to record all food and drinks consumption (2x2 days) to assess the habitual dietary intake. The diary will also be used for daily recording of bowel habits and frequency and severity of gastrointestinal complaints.
The following biological samples will be collected: 4x10 ml venous blood, a single fecal bolus (for screening) and 7x24 hrs feces. Blood is sampled for immune response analyses and the fecal samples are collected to quantify several infection- and immune system markers and to verify dietary calcium intake. Saliva is sampled three times before and after infection to quantify immune system markers.
Primary outcomes: Fecal ETEC excretion and severity of diarrhea (quantified by fecal output per day).
Secondary outcomes: Serum immune response to ETEC, self-reported stool consistency scores and gastrointestinal complaints, relative fecal wet weight.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Triple (Participant, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 55 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Signed informed consent
- •Age 18-55 yrs
- •Availability of internet connection
- •Willingness to replace habitual dairy product intake with the supplied low-calcium soy products
- •Willingness to abstain from products with high amounts of prebiotic fibers and from products with probiotics starting 1 month prior to study start
- •Willingness to give up blood donation from 1 month before the start of the experiment and during the entire experimental period.
排除标准
- •Current or previous underlying disease of the GI tract, liver, bile bladder, kidney, thyroid gland (self-reported)
- •Allergy to milk products or lactose intolerance (self-reported), since the capsules may contain milk traces from culture media
- •Allergy to soy products (self-reported)
- •Use of antibiotics, norit, laxatives (up till 6 months prior to inclusion), cholestyramine, acid burn inhibitors or immune suppressive agents (up till 3 months prior to inclusion), and pre- and probiotics (up till 1 month prior to inclusion).
- •High titer serum antibodies against ETEC (10 ml blood sample collected at screening)
- •ETEC detected in fecal sample (collected at screening)
- •Vegetarians
- •Heavy alcohol use (>4 consumptions/day or >20/week)
结局指标
主要结局
Change of fecal ETEC numbers over time as a marker of intestinal colonization resistance
时间窗: Days -1 and -2 before ETEC challenge and days 1,2,3,4,7 and 15 after challenge
The change over time in fecal ETEC numbers is compared between treatment and placebo group.
Change of total daily fecal output over time as a marker of infectious diarrhea
时间窗: Days -1 and -2 before ETEC challenge and on days 1,2,3,4,7 and 15 after challenge.
The change in the daily fecal output over time is compared between treatment and placebo group.
次要结局
- Daily Bristol Stool Score as a marker for stool consistency(Days -1 and -2 before ETEC challenge and on days 1-15 after challenge.)
- % fecal wet weight as a marker for Diarrhea severity(Days -1 and -2 before ETEC challenge and days 1-15 after challenge.)
- Stool frequency (number of stools per day)(Day -1 and -2 and days 0-15)
- Specific serum antibody response to CFAII(Before ETEC challenge and on day 15 after challenge.)
- Gastro-Intestinal Symptom Rating Scale (GSRS) for gastro-intestinal complaints(Days -1 and -2 before ETEC challenge and on days 1-15 after challenge)