Double blinded randomized placebo controlled trial to examine if intake of vitamin D supplement can prevent INFLUENZA PANDEMIC (H1N1) 2009 targeting on high school students

Double blinded randomized placebo controlled trial to examine if intake of vitamin D supplement can prevent INFLUENZA PANDEMIC (H1N1) 2009 targeting on high school students - Amateras IX

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000002532

Enrollment

300

Registered

2009-10-17

Start date

2009-10-01

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Influenza Pandemic (H1N1) 2009 Virus

Interventions

vitamin D3 placebo

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. Both the subject and guardian agreed to participate in the trial with written form of consent 2. Nothing correspond to excluding criteria

Exclusion criteria

Exclusion criteria: 1. Person who was already infected with Influenza Pandemic (H1N1) 2009 Virus 2. Person who has past history of urinary tract stone 3. Person who has chronic disease and taking any medication for more than one month 4. Person who is taking vitamin D supplement 5. Person who has serious allergy

Design outcomes

Primary

Measure	Time frame
doctor diagnosed influenza A	—

Secondary

Measure	Time frame
upper and lower respiratory symptoms School absent days	—

Countries

Japan

Contacts

Public ContactEmi Suzuki

Jikei University School of Medicine Division of Molecular Epidemiology

emisuzu@jikei.ac.jp

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026