For the first question about Irena's illness, she is most likely fighting influenza. Given that she is showing symptoms similar to her sick coworkers and that several workmates have called in sick, it suggests a contagious viral infection, and influenza fits this scenario well.
For the second question regarding the outbreak of gastroenteritis linked to bagged salad, the director should report this information to the FDA (Food and Drug Administration). The FDA is responsible for ensuring the safety of food products, including fruits and vegetables, and would manage investigations related to foodborne illnesses.