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Vitamin D and the Influenza Epidemic

This study has been completed.
Information provided by:
University of Tromso Identifier:
First received: August 11, 2010
Last updated: July 19, 2011
Last verified: July 2011
Subjects included in ongoing vitamin d intervention trials were asked by questionnaire if they were ill with influenza during the winter season 2009/2010 to see if vitamin d supplementation prevented flu like disease.

Condition Intervention Phase
Drug: choleclaciferol
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Vitamin D and the Influenza Epidemic

Resource links provided by NLM:

Further study details as provided by University of Tromso:

Primary Outcome Measures:
  • influenza during the winter season 2009/2010 [ Time Frame: up to 30 weeks ] [ Designated as safety issue: No ]

Enrollment: 569
Study Start Date: April 2010
Study Completion Date: October 2010
Primary Completion Date: September 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: cholecalciferol
cholecalciferol in doses 800-6000 IU per day
Drug: choleclaciferol
800-6000 IU cholecalciferol per day
Placebo Comparator: placebo
placebo identical looking as cholecalciferol capsules
Drug: choleclaciferol
800-6000 IU cholecalciferol per day


Ages Eligible for Study:   20 Years to 80 Years   (Adult, Senior)
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • participant in vitamin D versus placebo study

Exclusion Criteria:

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01182870

University of Tromsø
Tromsø, Norway, 9037
Sponsors and Collaborators
University of Tromso
Principal Investigator: rolf Jorde, md University of Tromso, Norway
  More Information

Responsible Party: Rolf Jorde, University of Tromsø Identifier: NCT01182870     History of Changes
Other Study ID Numbers: UIT-ENDO-2010-1 
Study First Received: August 11, 2010
Last Updated: July 19, 2011
Health Authority: Norway: Ethics Committee

Keywords provided by University of Tromso:
vitamin D

Additional relevant MeSH terms:
Influenza, Human
Orthomyxoviridae Infections
RNA Virus Infections
Virus Diseases
Respiratory Tract Infections
Respiratory Tract Diseases
Vitamin D
Growth Substances
Physiological Effects of Drugs
Bone Density Conservation Agents processed this record on October 21, 2016