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of sampling error (i.e., genetic drift). The newly founded population is also likely to have a less genetic variation than the source population (http://evolution.berkeley.edu/evosite/glossary/glossary_browse.shtml, accessed December 17, 2009).

Genome: The complete genetic composition of an organism (e.g., human, bacterium, protozoan, helminth, or fungus), contained in a chromosome or set of chromosomes or in a DNA or RNA molecule (e.g., a virus).

GeoSentinel: A worldwide communication and data collection network for the surveillance of travel related morbidity. It was initiated in 1995 by the International Society of Travel Medicine (ISTM) and the CDC as a network of ISTM member travel/tropical medicine clinics. GeoSentinel is based on the concept that these clinics are ideally situated to effectively detect geographic and temporal trends in morbidity among travelers, immigrants and refugees. For more information, see http://www.istm.org/geosentinel/main.html (accessed November 5, 2009).

Global Outbreak Alert and Response Network (GOARN): A technical collaboration of existing institutions and networks who pool human and technical resources for the rapid identification, confirmation and response to outbreaks of international importance. GOARN provides an operational framework to link this expertise and skill to keep the international community constantly alert to the threat of outbreaks and ready to respond. For more information, see http://www.who.int/csr/outbreaknetwork/en/ (accessed November 5, 2009).

HealthMap: Brings together disparate data sources to achieve a unified and comprehensive view of the current global state of infectious diseases and their effect on human and animal health. This freely available Web site integrates outbreak data of varying reliability, ranging from news sources (such as Google News) to curated personal accounts (such as ProMED) to validated official alerts (such as World Health Organization). Through an automated text processing system, the data is aggregated by disease and displayed by location for user-friendly access to the original alert. HealthMap provides a jumping-off point for realtime information on emerging infectious diseases and has particular interest for public health officials and international travelers. For more information, please see http://healthmap.org (accessed April 28, 2010).

Hemagglutinin: A molecule, such as an antibody or lectin, that agglutinates red blood cells.

Hemagglutinin (HA) protein: Species specific binding protein that allows for the virus to bind to the cell membrane of host respiratory cells and propagate through cellular processes (http://medical-dictionary.thefreedictionary.com/epitopes, accessed November 5, 2009).



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