Affiliations

• ¹ Centers for Disease Control and Prevention, Fort Collins, CO.
• ² University of California, San Francisco, San Francisco.
• ³ Intermountain Health, Salt Lake City.
• ⁴ University of Utah, Salt Lake City.
• ⁵ San Diego Blood Bank, San Diego, CA.
• ⁶ American Red Cross of Utah, Salt Lake City.
• ⁷ California Department of Public Health, Sacramento.
• ⁸ Los Angeles County Department of Public Health, Los Angeles.
• ⁹ County of San Diego Health and Human Services Agency, San Diego, CA.
• ¹⁰ Idaho Department of Health and Welfare, Salmon.
• ¹¹ Utah Department of Health and Human Services, Salt Lake City.
• ¹² University of California, Davis, Davis.
• ¹³ Centers for Disease Control and Prevention, Atlanta.