In 2014 a study: How quickly viruses can contaminate buildings — from just a single doorknob; was presented by Dr. Charles Gerba of the University of Arizona at the American Society for Microbiology in Washington, D.C. The study found that viruses will spread throughout an office building in as little as 2 to 4 hours. This test was designed to simulate how the norovirus could rapidly spread throughout an office. According to Dr. Gerba, eighty percent of the infections you get, you’re going to pick up from your environment. Dr. Gerba described offices as bacteria cafeterias, epitomizing this description; San Diego State University and the University of Arizona conducted a study. The research focused on 90 offices in three cities and found more than 500 species of bacteria.