Gastric Influenza Clinical Trial
Official title:
Evaluation of Combination Therapy With Oseltamivir and Zanamivir Versus Monotherapy in the Treatment of Virologically Confirmed Influenza in Primary Care a Randomises Double Blind Controlled Trial Study
In order to prevent the high mortality due to an hypothetic pandemic caused by a newly emerging influenza A virus, antiviral drugs are seen as essential requirements for control of initial influenza outbreaks.Two antivirals are available for the treatment oseltamivir and zanamivir. Emergence of Oseltamivir resistance has been recently reported. . It appeared opportune to assess the efficacy and safety of biotherapy of neuraminidase inhibitors ,will be investigated by a randomized, placebo controlled, double blind study in France, during the next winter season . This study will be conducted in 300 centres of primary care with 900 adults with a virologically suspected influenza A infection. Individuals will be randomized to 1 of the 3 treatment groups: oseltamivir +zanamivir, or oseltamivir+placebo or placebo +zanamivir.The primary judgment criteria will be the proportion of patients with negative RT PCR negative in nasal secretions at Day 2.
In the near future, a pandemic caused by a newly emerging influenza A virus has been
predicted by the WHO. In order to prevent the high mortality due to the pandemic, antiviral
drugs are seen as essential requirements for control of initial influenza outbreaks.
Zanamivir (GSK) and Oseltamivir (Roche) are stockpiled by the French government in the
setting of pre-pandemic plan. In France, Zanamivir and Oseltamivir are both registered for
the prophylactic and therapeutic use against influenza A.
Previous studies have shown that neuraminidase inhibitors (oseltamivir and zanamivir, based
treatment) are associated with shorter illness duration and resulted in significant decrease
of viral load in the nasal secretions.
In Winter season 2007-2008 the presence of oseltamivir-resistant viruses circulating in the
community in several European countries is in marked contrast to the previous winter
seasons, when oseltamivir resistance was detected in <1% of circulating strains from .
Patients infected by viruses with neuraminidases carrying these mutations, didn't present
unusual disease syndromes.
Although zanamivir and oseltamivir are both issued from the same class ,a combination of
these two neuraminidase inhibitors could reduce the duration and severity of acute influenza
and the incidence of secondary complications, reduce the spread of influenza, and the
frequency of neuraminidase inhibitors mutations. An evaluation of the combination of
oseltamivir and zanamivir versus zanamivir with placebo versus oseltamivir associated with
placebo in the treatment of a virologically suspected influenza in primary care will be
investigated in a randomised double blind placebo controlled trial study in France during
the winter season 2008-2009.
Primary outcome measure:
Evaluate viral efficacy after 2 days of biotherapy oseltamivir and zanamivir versus
zanamivir with placebo versus oseltamivir associated with placebo.
Patients and methods:
Randomised double blind, placebo controlled multicenter trial conducted during the influenza
season 2008-2009 Arm 1: oral oseltamivir 75mg twice daily + zanamivir 10 mg inhaled by mouth
twice daily during 5 days Arm 2: oral oseltamivir 75mg twice daily+ placebo inhaled by mouth
twice daily during 5 days Arm 3: oral placebo twice daily + zanamivir 10 mg inhaled by mouth
twice daily during 5 days.
Schedule:
D0: rapid test diagnostic for influenza A urine pregnancy test for women inclusion
/randomisation initiation of treatment D2:nasal sample for influenza RNA RTPCR D5:End of
treatment D7:medical evaluation (follow up evaluation) D14:nurse call (clinical evaluation)
;
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator), Primary Purpose: Treatment