From the Summary: "Most Covid-19 [coronavirus disease 2019] infections are thought to be caused when the virus spreads directly from one person who is infected, but may not even have any symptoms, to another person who is not infected. A far smaller number of infections are thought to be caused by contact with a contaminated surface or object. This document provides many details on how to prevent Covid-19 spread in the workplace."
Aspen Institute; World Central Kitchen; Off Their Plate; James Beard Foundation
Aspen Institute: https://www.aspeninstitute.org/