The Efficacy of Live Attenuated, Cold-Adapted, Trivalent, Intranasal Influenzavirus Vaccine in Children
Robert B. Belshe, M.D., Paul M. Mendelman, M.D., John Treanor, M.D., James King, M.D., William C. Gruber, M.D., Pedro Piedra, M.D., David I. Bernstein, M.D., Frederick G. Hayden, M.D., Karen Kotloff, M.D., Ken Zangwill, M.D., Dominick Iacuzio, Ph.D., and Mark Wolff, Ph.D.
Background Influenzavirus vaccine is used infrequently in healthychildren, even though the rates of influenza in this group arehigh. We conducted a multicenter, double-blind, placebo-controlledtrial of a live attenuated, cold-adapted, trivalent influenzavirusvaccine in children 15 to 71 months old.
Methods Two hundred eighty-eight children were assigned to receiveone dose of vaccine or placebo given by intranasal spray, and1314 were assigned to receive two doses approximately 60 daysapart. The strains included in the vaccine were antigenicallyequivalent to those in the inactivated influenzavirus vaccinein use at the time. The subjects were monitored with viral culturesfor influenza during the subsequent influenza season. A caseof influenza was defined as an illness associated with the isolationof wild-type influenzavirus from respiratory secretions.
Results The intranasal vaccine was accepted and well tolerated.Among children who were initially seronegative, antibody titersincreased by a factor of four in 61 to 96 percent, dependingon the influenza strain. Culture-positive influenza was significantlyless common in the vaccine group (14 cases among 1070 subjects)than the placebo group (95 cases among 532 subjects). The vaccineefficacy was 93 percent (95 percent confidence interval, 88to 96 percent) against culture-confirmed influenza. Both theone-dose regimen (89 percent efficacy) and the two-dose regimen(94 percent efficacy) were efficacious, and the vaccine wasefficacious against both strains of influenza circulating in19961997, A(H3N2) and B. The vaccinated children hadsignificantly fewer febrile illnesses, including 30 percentfewer episodes of febrile otitis media (95 percent confidenceinterval, 18 to 45 percent; P<0.001).
Conclusions A live attenuated, cold-adapted influenzavirus vaccinewas safe, immunogenic, and effective against influenza A(H3N2)and B in healthy children.
Source Information
From the Department of Medicine, Saint Louis University, St. Louis (R.B.B.); Aviron, Mountain View, Calif. (P.M.M.); the Department of Medicine, University of Rochester, Rochester, N.Y. (J.T.); the Department of Pediatrics, University of Maryland at Baltimore, Baltimore (J.K., K.K.); the Department of Pediatrics, Vanderbilt University, Nashville (W.C.G.); the Department of Microbiology and Immunology, Baylor College of Medicine, Houston (P.P.); the Department of Pediatrics, Children's Hospital Medical Center, Cincinnati (D.I.B.); the Departments of Internal Medicine and Pathology, University of Virginia, Charlottesville (F.G.H.); KaiserUCLA Vaccine Program and the Department of Pediatrics, HarborUCLA Medical Center, Los Angeles (K.Z.); the Division of Microbiology and Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md. (D.I.); and Emmes Corporation, Potomac, Md. (M.W.). Other authors were Keith Reisinger, M.D. (Pittsburgh Pediatric Research, Pittsburgh), Stan L. Block, M.D. (Kentucky Pediatric Research, Bardstown), Janet Wittes, Ph.D. (Statistics Collaborative, Washington, D.C.), and Regina Rabinovich, M.D. (Division of Microbiology and Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md.).
Address reprint requests to Dr. Belshe at Saint Louis University Health Sciences Center, Division of Infectious Diseases, 3635 Vista Ave., FDT-8N, St. Louis, MO 63110.
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