President Bush said yesterday that he would consider using the military to effect a quarantine" in the event of an outbreak of pandemic influenza in the United States. Bush also suggested that putting National Guard troops under federal, rather than state, control might be one part of a response to the "catastrophe" of an avian influenza outbreak. The president raised the same idea after Hurricane Katrina, suggesting that he is considering a greater role for the military in natural disasters. Most public health experts believe it is impossible to entirely isolate neighborhoods, towns, cities or regions during an outbreak of disease. Instead, quarantines today generally refer to a variety of strategies for identifying and limiting the movement of people who are infected with a contagious pathogen or are at high risk. That might include screening travelers for fever and flu symptoms; prohibiting large gatherings of people, including at some workplaces; and requiring that people exposed to infected individuals stay at home until the incubation period for the illness has passed. China took these measures during the outbreak of severe acute respiratory syndrome in 2003.

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