Former Israeli Prime Minister Ariel Sharon, in a coma since January, is now suffering from pneumonia, hospital officials say.
The condition of Mr Sharon, 78, has worsened this week.
A brain scan earlier in the week showed a deterioration in his brain function, and his urine output was decreasing, officials had earlier said.
The former leader has been in a coma since he suffered a major stroke in early January.
POLITICAL CAREER
After several operations on his brain, he was moved from Jerusalem's Hadassah hospital in May to a specialist centre for long-term care.
In late July he was rushed into intensive care to undergo kidney dialysis. Hospital officials said they also noticed changes in his brain membrane at the time.
His deputy, Ehud Olmert, assumed his powers in January before being elected prime minister in March.
Mr Sharon has been a giant of Israeli politics. He was first elected to the Knesset in 1973 and held a number of cabinet positions before he became prime minister in 2001.
A former army commander, as defence minister he masterminded Israel's disastrous invasion of Lebanon in 1982.
As housing minister in the early 1990s, he presided over the biggest building drive in Jewish settlements in the West Bank and Gaza since Israel occupied the territories in 1967.
But while prime minister, he went on to push through Israel's 2005 withdrawal from the Gaza Strip and four settlements in the northern West Bank, despite opposition from within his right-wing Likud party.
He also presided over the building of the controversial West Bank barrier.
Amid growing dissent, Mr Sharon left Likud in November last year to found a new party, Kadima (Forward), which scored a narrow win in the March parliamentary election under Mr Olmert.
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