Quarantining is an option for items that are not practical or possible to disinfect individually. One would have to wipe down every page of a book, for example. The amount of virus needed to infect someone is not yet known; that amount could fall close to or below the LOQ (limit of quantitation) or well above it. Without that knowledge to draw conclusions from, the REALM project is providing data that shows the rate of natural attenuation of the virus over time and how long before it becomes undetectable (< LOD).