The discovery of a new virus implicated in the death of a Kansas farmer this past June raises many questions about its host, prevalence, spectrum of disease, and ultimately its treatment and prevention, according to an infectious disease expert who treated the patient. Yesterday, the Kansas Department of Health and Environment announced the first known case of the so-called Bourbon virus, named after the Kansas county where the unidentified patient had lived. His symptoms — fever, low red and white blood cell counts, elevated liver enzymes, and loss of appetite — suggested a tick-borne illness such as ehrlichiosis or the...