In this Aug. 7, 2011, file photo, a worker uses a high-pressure hose to clean seats in Papa John's Stadium, in preparation for the upcoming college football season in Louisville, Kentucky. Billions has been spent on state-of-the-art sports facilities over the last quarter-century, but there is no way to prevent the potential spread of a virus through coughing or sneezing. Officials are working on safety protocols and looking at new technology in hopes of making stadiums and arenas as safe as they can.