Above the limit of quantitation (LOQ) Battelle researchers are able to plug results into an equation and obtain quantifiable data (e.g., virus count). Below this LOQ threshold, the researchers simply receive a positive or negative to indicate presence or nonpresence of virus. When the virus is no longer detectable, it is below the limit of detection (LOD). The infectious dose for humans remains unknown, so it is not yet possible to correlate the amount surviving on a surface as safe or unsafe.