Researchers with the University of South Alabama are the first to sign onto a study of West Nile virus. The school says genetic material from infected mosquitoes will be sent to Yale University's school of public health. Workers there will sequence DNA to help understand how the virus and spread and changed over the last two decades in the United States. Back in September, the Alabama Department of Public Health confirmed one human case of West Nile in the state, as well as two infected horses. The virus killed nearly 170 people nationwide last year.