A nurse is concerned that the nursing

A nurse is concerned that the nursing staff in her hospital has a poor understanding of factors that lead to a patient contracting H1N1 type influenza virus. Which of the follow research designs would give her the best information regarding risk factors for H1N1? A. A retrospective cohort study examining the correlation of H1N1 and previous diagnosis of pneumonia B. A case control study using two matched cohorts – one cohort of individuals diagnosed with H1N1 and one with individuals who have not had H1N1 – with regression analysis of prognostic indicators C. A randomized controlled trial with two arms where the independent variable is treatment with tamiflu and the dependent variable is the number of days spent in the hospital. D. A survey with descriptive statistics of individuals with one known risk factor for

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