1887

Abstract

Sin Nombre virus (SNV) and Andes virus (ANDV) cause hantavirus pulmonary syndrome (HPS) in humans. Both SNV and ANDV infect Syrian hamsters, but only ANDV causes lethal disease. A co-infection study was performed to determine which virus, SNV or ANDV, would dominate the survival outcome in hamsters. Infection of hamsters with SNV 1 day before ANDV challenge did not result in disease characteristic of the latter virus, and all animals survived challenge. Control animals infected solely with ANDV all succumbed by day 14. In contrast, when viruses were injected at the same site concurrently, all hamsters succumbed to HPS disease. Hantaviruses are segmented viruses; therefore we investigated which segment might be responsible for the protective phenotype of SNV by using two SNV/ANDV reassortant viruses, both with reciprocal M-segments from the other virus (denoted ASA and SAS). Both reassortants asymptomatically infect hamsters, similar to SNV. However, unlike SNV, 1 day prior preinfection with the reassortant virus did not prevent ANDV lethality. The ASA reassortant virus, but not SAS, protected hamsters from lethal ANDV infection when administered 3 days prior to ANDV challenge. Similar to SNV preinfection, the potent innate immune stimulator poly I:C administered to hamsters 1 day before ANDV challenge prevented lethal ANDV disease. Combined, these results suggest that the difference in pathogenicity of SNV and ANDV in hamsters involves differences in early host-pathogen interactions and resultant anti-viral immune responses of both the innate and adaptive immune system.

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2018-08-01
2024-10-06
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