1. University of Wisconsin, Department of Medical Microbiology & Immunology, Wisconsin State Laboratory of Hygiene, 465 Henry Mall, Madison, WI 53706, USA.
2. Wheaton Franciscan Laboratory, College of Health Sciences, University of Wisconsin–Milwaukee, 11020 West Plank Court, Suite 100, Wauwatosa, WI 53226, USA.
3. Gundersen Lutheran Medical Center, Microbiology Research Laboratory, Health Science Center, Room 5032, 1300 Badger Street, La Crosse, WI 54601, USA.
4. University of Wisconsin, Departments of Bacteriology, Medical Microbiology & Immunology, and Pathobiological Sciences, Wisconsin State Laboratory of Hygiene, 465 Henry Mall, Madison, WI 53706, USA.