Earlier Mr Berlusconi, appearing at a news conference in L'Aquila, the medieval city worst hit, thanked all involved in the rescue effort.
"There have been serious risks for the lives of those who are carrying out the rescue operation so far, inside buildings that have been damaged and, following another tremor, could easily collapse," he said.
"So therefore this is a very dangerous situation for the rescuers."
Hospitals have appealed for help from doctors and nurses throughout Italy.
Mr Berlusconi said another 48 hours would be enough to ascertain if anyone else was still alive.
Latest from Dominic Hughes in Fossa, a village near L'Aquila
Successes are becoming rarer. At two o'clock this morning a woman was rescued by a team of expert cavers after a long and painstaking operation to remove huge slabs of concrete.
But with every passing hour the likelihood of finding survivors is reduced.
Apart from the search for survivors the most urgent task is to find some kind of accommodation for thousands of people who are now unable to return to their damaged homes.
Many of them have already spent one night in tents or sleeping in cars, suddenly refugees in their own country.
"We have tried-and-tested mechanisms for the rescue operations that have been used before by the civil protection agency," he said.
He said that starting from Wednesday specialists would start checking individual buildings.
"The most delicate phase begins tomorrow because we have to inspect homes to check the damage," he said.
"We will inspect one room after another in thousands of homes."
Of the 207 who died, Mr Berlusconi said 190 people had been identified and the other 17 were awaiting formal identification.
About 15 people were still thought to be missing, but it was possible they had left the area without notifying authorities or relatives, he said.
As rescue efforts continued:
A 98-year-old woman was pulled out alive in L'Aquila after being trapped for 30 hours, local media report. She spent the time crocheting
Four students have been located in a collapsed university hall of residence, but remain trapped under large chunks of masonry, the Associated Press reports. It is not known whether they are alive or dead
A 23-year-old student was pulled alive with the help of specialist cavers from the rubble of a four-storey building in L'Aquila more than 22 hours after the quake struck
L'Aquila and the surrounding area were without water
Of the injured, 500 people were treated in hospitals, including 179 at regional hospitals, allowing families to visit them.
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