The US military pulled a Haitian man alive from under the rubble in Port-au-Prince, but it was not clear whether he had been trapped since the January 12 quake or more recently.
The middle-aged man was covered with dust, had facial injuries and appeared to have lost weight. Soldiers at the scene said he may have been a looter who became stuck in recent days when a damaged building collapsed.
Specialist Andrew Pourak said the man had "possibly" been trapped under the rubble for the past two weeks, but that he may also have become caught in the last several days amid the chaos that followed the disaster.
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"We don't know if he was there from the beginning or in one of the aftershocks he may have gone under," Pourak told AFP.
Haiti has been hit by at least 50 tremors since the original quake.
The man reportedly had a crushed leg and had been transported to a hospital.
"He got sent to the hospital, he's going to make it," Pourak said.
Some 133 people have been pulled alive from the ruins in Port-au-Prince since last week's devastating quake, which killed an estimated 150,000 people, but hope was evaporating that any more would be found.
The most recent rescue came Saturday, when search teams pulled a 25-year-old man out alive. He had been trapped in a grocer's shop and had been able to grab a small amount of food and drink to keep himself alive.
