Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
Q fever was first identified in Iowa, in both man and animal, in 1957. Subsequently the disease was demonstrated to occur enzootic ally among Iowa dairy cattle and, perhaps more important, constitute an occupational hazard of some degree for farmers and certain industrial groups in the state.
Tjalma, R. A. and Braun, J. L.
Iowa State University Veterinarian: Vol. 22
, Article 3.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol22/iss3/3