WASHINGTON - JUNE 06:  National Institute of Allergy and Infectious Diseases Director Anthony Fauci (R) speaks as Centers for Disease Control and Prevention Director Julie Gerberding (L) as a medical chart is shown during a hearing before the Senate Labor, Health and Human Services, Education, and Related Agencies Subcommittee of the Appropriations Committee June 6, 2007 on Capitol Hill in Washington, DC. The hearing was held to examine the case of extremely drug-resistant tuberculosis patient Andrew Speaker that triggered an international health scare after he went on his honeymoon in Europe and then returned through the U.S.-Canadian border despite an alert sent to border patrols of his condition. Getty Images logo Getty Images 60 months ago

WASHINGTON - JUNE 06: National Institute of Allergy and Infectious Diseases Director Anthony Fauci (R) speaks as Centers for Disease Control and Prevention Director Julie Gerberding (L) as a medical chart is shown during a hearing before the Senate Labor, Health and Human Services, Education, and Related Agencies Subcommittee of the Appropriations Committee June 6, 2007 on Capitol Hill in Washington, DC. The hearing was held to examine the case of extremely drug-resistant tuberculosis patient Andrew Speaker that triggered an international health scare after he went on his honeymoon in Europe and then returned through the U.S.-Canadian border despite an alert sent to border patrols of his condition.