Read the passage from When Birds Get Flu by John DiConsiglio. The disease that concerned Dr. Dowell was avian influenza, or bird flu. This virus usually strikes poultry, like chickens, ducks, and turkeys. It’s rare for bird flu to make people sick. What is most likely the author’s purpose in this passage? to explain what the case study is about to ask a question that he will answer later to add supplemental information that explains the situation to help the reader draw a conclusion based on the evidence