The purpose of this study is to evaluate the effects of catechin extracts containing mask on prevention of influenza infection.
Catechins are the major components of tea flavonoids and are reported to possess physiological activities such as antiviral effects. Recent in-vitro experimental studies have revealed that tea catechin extracts possess the effects on the prevention of influenza infection. However, a limited number of studies have been conducted on the clinical effects. Based on these backgrounds, we designed a prospective randomized controlled study to evaluate the effects of tea catechin extracts containing mask on the prevention of influenza infection.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
180
catechins are composed of tea catechin extracts available in grren tea supplements
Seirei Hamamatsu General Hospital
Hamamatsu, Shizuoka, Japan
University of Shizuoka
Shizuoka, Shizuoka, Japan
the incidence rate of influenza infection during the study
Time frame: assessed at each month
the incidence rates of upper respiratory tract infections
Time frame: assessed at each month
the severity of the symptoms and the duration of the cold among incident cases
Time frame: assessed at each month
he incidence-free time for influenza or upper respiratory tract infections after the intervention
Time frame: assessed at each month
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