Started after the anthrax poisonings of 2001, the Department of Homeland Security's Bio-Watch project monitors the air in target cities for bioterrorism attacks from pathogens such as anthrax and smallpox. The project hardware collects daily samples and sends them out to labs for testing. Tularemia (rabbit fever) was detected in Houston, Texas, during three consecutive days in 2003, but no illnesses were reported. Critics claim that the program is very expensive and monitors only outside air, whereas most bioterrorism attacks to date have taken place in enclosed places, such as offices or subways.
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