Effects of Tea Catechin Consumption on the Prophylaxis of Influenza Infection

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

200 participants

Study Classification

INTERVENTIONAL

Study Start Date

2009-11-30

Study Completion Date

2010-10-31

Brief Summary

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The Purpose of this study is to evaluate the effects of 5 months catechin consumption on the prevention of influenza infection.

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Detailed Description

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Catechins are the major components of tea flavonoids and are reported to possess physiological activities such as antiviral effects. Recent experimental studies have revealed that tea catechin extracts prevent influenza infection, but few studies have been conducted on the clinical effects of tea catechin consumption on the prophylaxis of influenza infection. Based on these backgrounds, we designed a prospective randomized controlled study to evaluate the effects of 5 months tea catechin consumption on the prophylaxis of influenza infection.

Conditions

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Influenza Infection

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

PREVENTION

Blinding Strategy

QUADRUPLE

Participants Caregivers Investigators Outcome Assessors

Study Groups

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Dietary supplement: placebo

Group Type NO_INTERVENTION

No interventions assigned to this group

Tea catechin extracts

Group Type ACTIVE_COMPARATOR

tea catechin extracts

Intervention Type DIETARY_SUPPLEMENT

Tea catechin extracts 540 mg/day, are consumed for 5 months.

Interventions

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tea catechin extracts

Tea catechin extracts 540 mg/day, are consumed for 5 months.

Intervention Type DIETARY_SUPPLEMENT

Eligibility Criteria

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Inclusion Criteria

* aged over 20 years
* possible to maintain without drinking tea more than 250 ml per day during the study
* possible to maintain without taking supplements or herbal products including catechin extracts during the study
* possible to fill out a questionnaire personally
* Obtained written informed consent before participation

Exclusion Criteria

* Possessing some chronic infectious diseases in need of therapy
* Possessing tea or catechin allergy
* Possessing a history of influenza infection before six months prior to the study
* diagnosed as inadequate for other reasons to participate the study by principal investigator

Minimum Eligible Age

20 Years

Maximum Eligible Age

90 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes