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Simian hemorrhagic fever (SHF) is an often lethal disease of Asian macaques. Simian hemorrhagic fever virus (SHFV) is one of at least three distinct simian arteriviruses that can cause SHF, but pathogenesis studies using modern methods have been scarce. Even seemingly straightforward studies, such as examining viral tissue and cell tropism  in vivo , have been difficult to conduct due to the absence of standardized SHFV-specific reagents. Here we report the establishment of an  in situ  hybridization assay for the detection of SHFV and distantly related Kibale red colobus virus 1 (KRCV-1) RNA in cell culture. In addition, we detected SHFV RNA in formalin-fixed, paraffin-embedded tissues from an infected rhesus monkey ( Macaca mulatta ). The assay is easily performed and can clearly distinguish between SHFV and KRCV-1. Thus, if further developed, this assay may be useful during future studies evaluating the mechanisms by which a simian arterivirus with a restricted cell tropism can cause a lethal nonhuman primate disease similar in clinical presentation to human viral hemorrhagic fevers.

Specific Detection of Two Divergent Simian Arteriviruses Using RNAscope In Situ Hybridization