It has potential. Its a nicely written piece. It does need some editing. Your story is about the bubonic plague, no? Is this to be a strictly factual account, or are you mixing in some creative license? Either way, I would pick an individual or even better a couple of people and follow them on their path from ship to various places around the city. It is thus that you could show its spread, knowing no distinctions such as class or wealth or age.