Research in the Santangelo lab is primarily focused on three areas, native RNA regulation, RNA virus pathogenesis, and RNA therapeutics and vaccines, where the application and development of imaging technology is applied to all three areas. To address RNA regulation, localization and dynamics in the cellular milieu, we have developed single molecule sensitive approaches for imaging native RNAs and RNA dynamics in live cells, as well as the first assay to detect native RNA-protein interactions in situ. To date, the results of these methods have been applied to the cell biology of human respiratory syncytial virus infections and RNA regulation during tumorigenesis. The methods and their results have been published in high impact journals such as Nature Methods, Nature Nanotechnology, ACS Nano, Traffic, Journal of Virology, Nucleic Acids Research, and Journal of Biological Chemistry. These methods are also being used to interrogate and develop RNA-based therapeutics and vaccines. In addition we have been developing whole-body, PET/CT imaging tools for interrogating SIV infections within the macaque model. The purpose of this tool is to answer fundamental questions regarding the location of residual virus during treatment, in the hope of learning vital information that could be applied to approaches seeking to “cure” SIV or HIV. This tool was published recently in Nature Methods.