Bones shut down production on Monday because David Boreanaz came down with the flu.
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Executive producer Hart Hanson jokingly implied that swine flu was to blame for the 40-year-old Boreanaz's absence. "First time in Bones history we are shut down from production," Hanson tweeted. "Damn swine flu! That's gonna cut into Christmas hiatus."
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Boreanaz called in sick on Monday, but with nothing more than a seasonal flu, a studio rep tells TVGuide.com.
"We expect him back tomorrow," Hanson later tweeted.