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InfluenzaIRISNCT00884117

Influenza Resistance Information Study

An observational study of Influenza, run by Hoffmann-La Roche at 8 sites in 8 countries.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This study will assist in the early detection of influenza resistant to antivirals and will monitor the clinical outcome of adults and children infected with influenza according to subtype and susceptibility. Read more about this study

Who is it for?
Any age
Conditions the study is for
Influenza
What is being tested?
Oseltamivir
How many people
4,561 participants
Where
8 sitesin 8 countries
Study dates
Jan 2009to Nov 2015
Phase
Observational
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages Any age
  • All sexes
  • No healthy volunteers
  • Child, Adult, Older adult

Study population: Participants with a positive diagnostic test of influenza and/or displaying symptoms suggestive of influenza-like illness will be enrolled.

Who may be able to join

  • Participants greater than or equal to (≥) 1 year of age with a positive diagnostic test of influenza and/or displaying symptoms suggestive of influenza-like illness (during Years 1 to 5)
  • Participants less than or equal to (≤) 12 years of age with a positive diagnostic test of influenza and displaying symptoms suggestive of influenza-like illness and who are being or, according to local standard of care, will be treated with an influenza antiviral (during Years 6 and 7)

Who cannot join

  • Allergy to any potential influenza therapy
  • Living in the same household or residential/care home as another study participant

Trial locations and contacts

8 sites in 8 countries.

8 sites in 8 countries

United States1 site
  • Study site

    Chicago, Illinois, 60655

Other trials in United States

Australia1 site
  • Study site

    Westmead, New South Wales, 2145

Other trials in Australia

France1 site
  • Study site

    Bron, 69677

Other trials in France

Germany1 site
  • Study site

    Berlin, 14052

Other trials in Germany

Hong Kong1 site
  • Study site

    Shatin

Other trials in Hong Kong

Netherlands1 site
  • Study site

    Rotterdam, 3000 CA

Other trials in Netherlands

Norway1 site
  • Study site

    Sandnes, 4313

Other trials in Norway

Poland1 site
  • Study site

    Krakow, 31-159

Other trials in Poland

About this study

Official title: Influenza Resistance Information Study (IRIS)

This study will assist in the early detection of influenza resistant to antivirals and will monitor the clinical outcome of adults and children infected with influenza according to subtype and susceptibility. Participants clinically diagnosed with influenza will undergo a rapid diagnostic test and viral sampling at Baseline and on Days 3, 6, and 10. Participants will be clinically managed according to local guidelines and the decision to treat/not treat will be at the discretion of the Investigator.

Conditions
Influenza
Being tested
Oseltamivir
Medical subject headings
Influenza, Human

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • OseltamivirDrug

    Also called Tamiflu

    Participants may receive treatment at the discretion of the investigator according to local practice standards, and there is no protocol-specified intervention. However, analyses will be presented separately for participants treated with oseltamivir during the course of the study.

Study groups in NCT00884117
Study groupRoleWhat they receive
Participants Infected with InfluenzaParticipants with a positive diagnostic test of influenza and/or displaying symptoms suggestive of influenza-like illness will be enrolled and followed for up to 10 days after informed consent for virological surveillance and assessment of clinical outcomes. Participants may receive treatment including oseltamivir, other treatment/medication, or no treatment.
Receives: Drug: Oseltamivir

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of Participants With Genotypic Resistance

    Samples were analyzed using reverse transcriptase-polymerase chain reaction (RT-PCR). Pre-defined mutations in viral ribonucleic acid (RNA) were noted, the presence of which was defined as genotypic resistance. The number of participants with genotypic resistance at Baseline was reported. The number of participants with genotypic resistance post-Baseline was determined by a collective count of all participants who had a resistance mutation at least once on Days 3, 6, and/or 10. (Hereafter, "H" stands for hemagglutinin and "N" stands for neuraminidase in abbreviations of viral subtype such as H1N1, H1N1pdm09, and H3N2.)

    Measured: Baseline (Day 1) and post-Baseline (Days 3, 6, 10)

  2. Percentage of Participants Exhibiting Treatment-Emergent Resistance by Study Year Among Participants With H3N2 or H1N1pdm09 Infections

    Pre-defined mutations in viral RNA were noted, the presence of which was defined as genotypic resistance. Treatment-emergent resistance was defined as the presence of genotypic or phenotypic resistance from a post-Baseline sample in the setting of a previously non-resistant Baseline sample. The percentage of participants with treatment-emergent resistance was reported by study year for participants with H3N2 or H1N1pdm09 infections. Only data with evaluable participants were reported.

    Measured: From Baseline (Day 1) to Day 10 (assessed on Days 1, 3, 6, 10) during Study Years 1, 2, 3, 4, 5, 6, 7

Secondary outcomes (23)
  1. Number of Participants With Viral RNA Detected by RT-PCR on Day 1 Among Adults Treated With Oseltamivir

    Measured: Baseline (Day 1)

  2. Number of Participants With Viral RNA Detected by RT-PCR on Day 3 Among Adults Treated With Oseltamivir

    Measured: Day 3

  3. Number of Participants With Viral RNA Detected by RT-PCR on Day 6 Among Adults Treated With Oseltamivir

    Measured: Day 6

  4. Number of Participants With Viral RNA Detected by RT-PCR on Day 10 Among Adults Treated With Oseltamivir

    Measured: Day 10

  5. Number of Participants With Viral RNA Detected by RT-PCR on Day 1 Among Children Treated With Oseltamivir

    Measured: Baseline (Day 1)

  6. Number of Participants With Viral RNA Detected by RT-PCR on Day 3 Among Children Treated With Oseltamivir

    Measured: Day 3

  7. Number of Participants With Viral RNA Detected by RT-PCR on Day 6 Among Children Treated With Oseltamivir

    Measured: Day 6

  8. Number of Participants With Viral RNA Detected by RT-PCR on Day 10 Among Children Treated With Oseltamivir

    Measured: Day 10

  9. Time to Non-Detection of Viral RNA

    Time to non-detection/viral clearance was the time between symptom onset and the day on which viral RNA was no longer detected, or the last visit date if the participant was not RNA-negative at that visit. Time to non-detection/viral clearance was estimated using Kaplan-Meier analysis and expressed in days.

    Measured: From Baseline (Day 1) to Day 10 (assessed on Days 1, 3, 6, 10)

  10. Time to Non-Detection of Viral RNA Among Participants With H3N2 Infections

    Time to non-detection/viral clearance was the time between symptom onset and the day on which viral RNA was no longer detected, or the last visit date if the participant was not RNA-negative at that visit. Time to non-detection/viral clearance was estimated using Kaplan-Meier analysis and expressed in days.

    Measured: From Baseline (Day 1) to Day 10 (assessed on Days 1, 3, 6, 10)

  11. Time to Non-Detection of Viral RNA Among Participants With H1N1pdm09 Infections

    Time to non-detection/viral clearance was the time between symptom onset and the day on which viral RNA was no longer detected, or the last visit date if the participant was not RNA-negative at that visit. Time to non-detection/viral clearance was estimated using Kaplan-Meier analysis and expressed in days.

    Measured: From Baseline (Day 1) to Day 10 (assessed on Days 1, 3, 6, 10)

  12. Time to Non-Detection of Viral RNA Among Participants With Influenza B Infections

    Time to non-detection/viral clearance was the time between symptom onset and the day on which viral RNA was no longer detected, or the last visit date if the participant was not RNA-negative at that visit. Time to non-detection/viral clearance was estimated using Kaplan-Meier analysis and expressed in days.

    Measured: From Baseline (Day 1) to Day 10 (assessed on Days 1, 3, 6, 10)

  13. Viral Load Among Adults Treated With Oseltamivir

    Viral load was determined for those with detectable virus above the lower limit of quantification (LLQ) of 1.82 for influenza A viruses and 1.99 for influenza B viruses. The viral load from each sample was averaged among all participants and expressed in log10 of the number of viral particles per milliliter (log10 vp/mL).

    Measured: Days 1, 3, 6, 10

  14. Viral Load Among Children Treated With Oseltamivir

    Viral load was determined for those with detectable virus above the LLQ of 1.82 for influenza A viruses and 1.99 for influenza B viruses. The viral load from each sample was averaged among all participants and expressed in log10 vp/mL.

    Measured: Days 1, 3, 6, 10

  15. Percentage of Participants With Symptom Resolution on Day 6 Comparing Resistant and Susceptible Viruses

    Pre-defined mutations in viral RNA were noted, the presence of which was defined as genotypic resistance. Phenotypic resistance was defined as 50% inhibitory concentration (IC50) more than 10-fold higher than the median value for all viruses of the same subtype. Treatment-emergent resistance was defined as the presence of genotypic or phenotypic resistance from a post-Baseline sample in the setting of a previously non-resistant Baseline sample. Susceptible viruses were those that did not exhibit treatment-emergent resistance. The percentage of participants with mild or absent symptoms on Day 6 was reported and stratified by resistant and susceptible viruses.

    Measured: Day 6

  16. Percentage of Participants by Day of Viral RNA First Not Detected Comparing Resistant and Susceptible Viruses

    Pre-defined mutations in viral RNA were noted, the presence of which was defined as genotypic resistance. Phenotypic resistance was defined as IC50 more than 10-fold higher than the median value for all viruses of the same subtype. Treatment-emergent resistance was defined as the presence of genotypic or phenotypic resistance from a post-Baseline sample in the setting of a previously non-resistant Baseline sample. Susceptible viruses were those that did not exhibit treatment-emergent resistance. The percentage of participants by earliest post-Baseline test day on which viral RNA was not detected was reported and stratified by resistant and susceptible viruses.

    Measured: Days 3, 6, 10

  17. Percentage of Participants With Resistant Versus Susceptible Viruses by Baseline Viral Load

    Pre-defined mutations in viral RNA were noted, the presence of which was defined as genotypic resistance. Phenotypic resistance was defined as IC50 more than 10-fold higher than the median value for all viruses of the same subtype. Treatment-emergent resistance was defined as the presence of genotypic or phenotypic resistance from a post-Baseline sample in the setting of a previously non-resistant Baseline sample. Susceptible viruses were those that did not exhibit treatment-emergent resistance. The mean viral load from each sample was expressed in log10 vp/mL and stratified by resistant and susceptible viruses.

    Measured: Baseline (Day 1)

  18. Total Daily Symptom Score According to Global Assessment by the Investigator Among Adults Treated With Oseltamivir

    Symptoms were assessed on Days 1, 6, and 10. The Investigator rated seven symptoms of fever, sore throat, nasal congestion, cough, aches/pains, headache, and fatigue on a scale of 0 (absent/no problem) to 3 (severe/major problem). The global score was calculated as a sum of all individual symptom scores. Global scores may range from 0 to 21, with higher scores indicating worse or more pronounced symptoms.

    Measured: Days 1, 6, 10

  19. Total Daily Symptom Score According to Global Assessment by the Investigator Among Children Treated With Oseltamivir

    Symptoms were assessed on Days 1, 6, and 10. The Investigator rated seven symptoms of fever, sore throat, nasal congestion, cough, aches/pains, headache, and energy/tiredness on a scale of 0 (absent/no problem) to 3 (severe/major problem). The global score was calculated as a sum of all individual symptom scores. Global scores may range from 0 to 21, with higher scores indicating worse or more pronounced symptoms.

    Measured: Days 1, 6, 10

  20. Body Temperature Among Adults Treated With Oseltamivir

    Body temperature was measured by the Investigator using an oral or tympanic thermometer at Baseline and Day 10. Body temperature at each visit was averaged among all participants and expressed in degrees Celsius.

    Measured: Days 1, 10

  21. Change From Baseline in Body Temperature Among Adults Treated With Oseltamivir

    Body temperature was measured by the Investigator using an oral or tympanic thermometer at Baseline and Day 10. The change in body temperature between visits was averaged among all participants and expressed in degrees Celsius.

    Measured: Baseline (Day 1) to Day 10

  22. Body Temperature Among Children Treated With Oseltamivir

    Body temperature was measured by the Investigator using an oral or tympanic thermometer at Baseline and Day 10. Body temperature at each visit was averaged among all participants and expressed in degrees Celsius.

    Measured: Days 1, 10

  23. Change From Baseline in Body Temperature Among Children Treated With Oseltamivir

    Body temperature was measured by the Investigator using an oral or tympanic thermometer at Baseline and Day 10. The change in body temperature between visits was averaged among all participants and expressed in degrees Celsius.

    Measured: Baseline (Day 1) to Day 10

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted20 Apr 2009 (estimated)
  2. Study startJan 2009
  3. Primary completionNov 2015
  4. Study completionNov 2015

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Case only
Time perspective
Prospective
Enrolment
4,561 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT00884117
Sponsor's protocol ID
NV20237
Other IDs
2008-006149-24, 2008
Acronym
IRIS
Status last verified
Oct 2016
First submitted
15 Apr 2009
Last updated
19 Oct 2016

Publications

  • Roosenhoff R, Reed V, Kenwright A, Schutten M, Boucher CA, Monto A, Clinch B, Kumar D, Whitley R, Nguyen-Van-Tam JS, Osterhaus ADME, Fouchier RAM, Fraaij PLA. Viral Kinetics and Resistance Development in Children Treated with Neuraminidase Inhibitors: The Influenza Resistance Information Study (IRIS). Clin Infect Dis. 2020 Aug 22;71(5):1186-1194. doi: 10.1093/cid/ciz939.

    PubMed 31560055
  • Fraaij PL, Schutten M, Javouhey E, Burleigh L, Outlaw R, Kumar D, Boucher CA. Viral shedding and susceptibility to oseltamivir in hospitalized immunocompromised patients with influenza in the Influenza Resistance Information Study (IRIS). Antivir Ther. 2015;20(6):633-42. doi: 10.3851/IMP2957. Epub 2015 Apr 7.

    PubMed 25849228

Questions about this trial

What is this clinical trial studying?

An observational study of Influenza, run by Hoffmann-La Roche at 8 sites in 8 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 2 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 19 Oct 2016. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 8 sites in United States, Australia, France, Germany, Hong Kong and 3 more countries. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

Yes. Results are posted in the registry (first posted 19 Jul 2016). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of Participants With Genotypic Resistance (time frame: Baseline (Day 1) and post-Baseline (Days 3, 6, 10)). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT00884117, which also lists 2 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 19 Oct 2016.

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