A 35-year-old postal worker presents to your office for evaluation of pain in her joints. She states that the pain is worse in her fingers and wrists; both hands are affected. She notices that it takes her longer than 1 hour to get moving in the morning because she is so stiff. For the past few weeks she has been having fevers some as high as 100.5°F. You notice that she has fusiform swelling in her fingers and wrists bilaterally and that the PIP and MCP joints are tender to palpation. Based on the history and physical examination findings what is your most likely diagnosis?