system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
You are attempting to quantify the degree of infectivity of a novel respiratory virus. You assess 1,000 patients who have been exposed to the virus and find that 500 ultimately are found positive for the virus within a 1-year follow up period. Conversely, from a 1,000 patient control group who has not been exposed to carriers of the virus, only 5 became positive over the same 1-year period. What is the relative risk of a contracting this virus if exposed?
assistant
[500/ (500 + 500)] / [5 / (5 + 995)]