During flu season last year, Alfredo Galdamez recalls several co-workers showing up for work at his Chicago restaurant while sick. The eatery had an open kitchen, and at times the dishwasher could see cooks coughing or sneezing near the food they prepared.Galdamez admits that he, too, washed dishes while ill, knowing that he could easily pass his sickness on to co-workers as well as diners.