Efficacy of the Rhesus RotavirusBased Quadrivalent Vaccine in Infants and Young Children in Venezuela
Irene Pérez-Schael, M.S., María J. Guntiñas, M.D., Mireya Pérez, M.D., Vito Pagone, M.S., Ana M. Rojas, Ph.D., Rosabel González, B.S., Walter Cunto, Ph.D., Yasutaka Hoshino, D.V.M., and Albert Z. Kapikian, M.D.
Background Rotaviruses are the principal known etiologic agentsof severe diarrhea among infants and young children worldwide.Although a rhesus rotavirusbased quadrivalent vaccineis highly effective in preventing severe diarrhea in developedcountries, in developing countries its efficacy has been lessimpressive. We thus conducted a catchment study in Venezuelato assess the efficacy of the vaccine against dehydrating diarrhea.
Methods In this randomized, double-blind, placebo-controlledtrial, 2207 infants received three oral doses of the quadrivalentrotavirus vaccine (4x105 plaque-forming units per dose) or placeboat about two, three, and four months of age. During approximately19 to 20 months of passive surveillance, episodes of gastroenteritiswere evaluated at the hospital.
Results The vaccine was safe, although 15 percent of the vaccinatedinfants had febrile episodes (rectal temperature, >38.1°C)during the six days after the first dose, as compared with 7percent of the controls (P<0.001). However, the vaccine gave88 percent protection against severe diarrhea caused by rotavirusand 75 percent protection against dehydration, and produceda 70 percent reduction in hospital admissions. Overall, theefficacy of the vaccine against a first episode of rotavirusdiarrhea was 48 percent. Horizontal transmission of vaccinevirus was demonstrated in 15 percent of the vaccine recipientsand 13 percent of the placebo recipients with rotavirus-positivediarrhea.
Conclusions In this study in a developing country, the quadrivalentrhesus rotavirusbased vaccine induced a high level ofprotection against severe diarrheal illness caused by rotavirus.
Source Information
From the Sección de Investigación de Enfermedades Entéricas, Instituto de Biomedicina/Universidad Central de Venezuela/Ministerio de Sanidad, Fuvesin, Caracas, Venezuela (I.P.-S., M.J.G., M.P., V.P., A.M.R., R.G.); the Instituto de Biomedicina de Venezuela, Caracas (W.C.); and the Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, Md. (Y.H., A.Z.K.).
Address reprint requests to Dr. Pérez-Schael at the Instituto de Biomedicina Fuvesin, A.P. 4043, Carmelitas, Caracas 1010A, Venezuela.
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