title: Absence of dengue 2 infection enhancement in human sera containing Japanese encephalitis antibodies.
abstract: Sera from 52 young adults resident in a rural area in North Thailand were studied for plaque-reducing neutralizing antibodies against dengue (DEN) viruses types 1-4 and Japanese encephalitis (JE), and for DEN-2 infection-enhancing antibodies using a newly described microtest in the human monocyte cell line, U-937. Infection-enhancing antibody titers in U-937 cells using a simplified micromethod were similar to results obtained by published methods using human peripheral blood leukocytes and a macrotest using U-937 cells. In the sample, there were 23 with antibodies to one or more DEN viruses with or without accompanying JE antibodies; 16 sera demonstrated antibodies only to JE and 13 had no detectable antibodies to any flavivirus. All but two DEN antibody-containing sera enhanced DEN-2 infections in U-937 cells, often to titers of 1:10,000 or greater. By contrast, only one of 16 JE-immune sera enhanced DEN-2 infection in monocytes, and that at a dilution of 1:100. None of the flavivirus-negative sera had DEN-2 enhancing activity. The failure of human anti-JE contrasts with the ability of rabbit anti-JE to enhance DEN-2 infections, but correlates with the absence of recorded instances of dengue shock syndrome in human beings sequentially infected with JE and then a DEN virus. This report seemingly reconciles in vitro and in vivo phenomena, and may provide an opportunity to study mechanisms involved.
mesh_terms: D000328:Adult; D000914:Antibodies, Viral / Q000502:physiology*; D002460:Cell Line; D003716:Dengue Virus / Q000254:growth & development* / Q000276:immunology; D004664:Encephalitis Virus, Japanese / Q000276:immunology*; D006801:Humans; D009000:Monocytes / Q000382:microbiology*; D009500:Neutralization Tests; D013785:Thailand
chemical_list: D000914:Antibodies, Viral