Accession Number : ADA135750

Title :   Evaluation Studies of the DEN-2/S-1 Vaccine.

Descriptive Note : Annual rept. 1 Apr-1 Aug 80,

Corporate Author : PUERTO RICO UNIV SAN JUAN

Personal Author(s) : Kraiselburd,E

PDF Url : ADA135750

Report Date : Aug 1980

Pagination or Media Count : 9

Abstract : Four groups of six nonimmune male rhesus monkeys were inoculated subcutaneously with formulations of dengue type 2 vaccine virus DEN-2/S-1. Group A received 1.9 x 104 plague-forming units of vaccine in normal human serum albumin diluent. Group B received the same dose combined with a dengue type 2-immune human serum diluted 1:1,600, beyound its neutralization endpoint of 1:300, but having an immune enhancement titer of 250,000. Groups C and D received 10-fold dilutions of these respective formulations. No migration-inhibitory factor was found when peripheral blood mononuclear leukocytes obtained on day 68 post-immunization from monkeys of all experimental groups were tested. No viremia was detected in any of the monkeys when sera taken on postvaccination days 1 through 12 were inoculated into adult Toxorhynchites amboinensis mosquitoes and LLC-MK2 cells. By day 89, four of the six monkeys had seroconverted by the neutralization test in each of groups, A,B, and C, and three of five monkeys in group D (one monkey died from cardiac collapse after anesthesia) had seroconverted. Immune enhancement heterologous flavivirus antibodies. In this study, there was no enhancing effect when antibody was mixed with dengue type 2 vaccine virus and injected subcutaneously.

Descriptors :   *Vaccines, *Live vaccines, *Immunity, Dengue, Immune serums, Antibodies, Response(Biology), Rhesus monkeys

Subject Categories : Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE