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A correction has been published: N Engl J Med 1998;338(14):1002.

Original Article
Volume 337:1181-1187 October 23, 1997 Number 17
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Efficacy of the Rhesus Rotavirus–Based 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.

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ABSTRACT

Background Rotaviruses are the principal known etiologic agents of severe diarrhea among infants and young children worldwide. Although a rhesus rotavirus–based quadrivalent vaccine is highly effective in preventing severe diarrhea in developed countries, in developing countries its efficacy has been less impressive. We thus conducted a catchment study in Venezuela to assess the efficacy of the vaccine against dehydrating diarrhea.

Methods In this randomized, double-blind, placebo-controlled trial, 2207 infants received three oral doses of the quadrivalent rotavirus vaccine (4x105 plaque-forming units per dose) or placebo at about two, three, and four months of age. During approximately 19 to 20 months of passive surveillance, episodes of gastroenteritis were evaluated at the hospital.

Results The vaccine was safe, although 15 percent of the vaccinated infants had febrile episodes (rectal temperature, >38.1°C) during the six days after the first dose, as compared with 7 percent of the controls (P<0.001). However, the vaccine gave 88 percent protection against severe diarrhea caused by rotavirus and 75 percent protection against dehydration, and produced a 70 percent reduction in hospital admissions. Overall, the efficacy of the vaccine against a first episode of rotavirus diarrhea was 48 percent. Horizontal transmission of vaccine virus was demonstrated in 15 percent of the vaccine recipients and 13 percent of the placebo recipients with rotavirus-positive diarrhea.

Conclusions In this study in a developing country, the quadrivalent rhesus rotavirus–based vaccine induced a high level of protection 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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Related Letters:

A Quadrivalent Rotavirus Vaccine
O'Ryan M. L., Matson D. O., Davidson B. L., Keusch G. T., Cash R. A.
Extract | Full Text  
N Engl J Med 1998; 338:620-622, Feb 26, 1998. Correspondence

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