[1] Univ Wisconsin Hosp & Clin, Dept Pathol & Lab Med, Madison, WI 53792 USA
[2] Univ Wisconsin, Dept Med, Sch Med & Publ Hlth, Div Infect Dis, Madison, WI 53706 USA
[3] Indiana State Dept Hlth, Epidemiol Resource Ctr, Indianapolis, IN 46202 USA
[4] Amer Red Cross, Sci Affairs, Washington, DC 20006 USA
[5] Amer Red Cross, Donor & Client Support Ctr, Washington, DC 20006 USA
[6] Wisconsin Dept Hlth Serv, Bur Communicable Dis, Madison, WI USA
[7] Amer Red Cross, Washington, DC 20006 USA
[8] Amer Red Cross, Blood Serv, Washington, DC 20006 USA