<prompt> Break bone fever is caused by:VariolaCoxsackieDengueAdenovirus  <response>: Ans. is c i.e., DengueThe dengue virus causes classic dengue or break bone fever characterized by fever, muscle and joint pain, lymph - adenopathy and rash. In addition, it also causes dengue hemorrhagic fever, i.e., a much more severe disease than classic dengue fever with a high fatality rate. 