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The rocker, 43, had been stricken with a series of severe respiratory tract infections combined with the flu since mid-January.
"Due to extreme dehydration and fatigue, doctors were unable to control it with outpatient treatment and advised the singer to check into the hospital," Kravitz's spokeswoman said in a statement.
The condition has forced the postponement of Kravitz's European tour to promote his new album It Is Time For a Love Revolution.
– Caris Davis
JOSH & FERGIE: ROCKED BY SCANDAL
Did he cheat with a stripper?
Married less than a year, the couple denies an Atlanta woman’s claims that she and Josh had a fling
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