With half of the nation’s private-sector employees working at small businesses, federal officials said they want the enterprises to take precautions to prevent a disruption to the economy as the virus, also known as swine flu, wends its way across the United States.

“We are already seeing an uptick in cases across the country,” Homeland Security Secretary Janet Napolitano said in a conference call Monday. “We expect that to continue throughout the fall and winter.”

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