A vast foreign aid effort is struggling to meet survivors' needs 17 days after the disaster, which killed around 170,000 people and left one million homeless and short of medicine, food and water.

"Several medical teams report a growing caseload of diarrhea in the last two to three days," World Health Organization spokesman Paul Garwood said.

"There are also reports of measles and tetanus, including in resettlement camps, which is worrisome due to the high concentration of people," he told journalists in Geneva.

UN agencies and Haiti's government aim to launch a vaccination campaign against measles, tetanus and diphtheria next week. Just 58 percent of Haitian infants were immunized before the quake, Garwood said.

He highlighted a "critical" need for surgeons, with an estimated 30 to 100 amputations being carried out every day in some hospitals, while supplies of anesthetics and antibiotics were also needed.

The 7.0-magnitude quake on January 12 decimated Haiti's already meager health system, creating conditions for disease to thrive in cramped refugee camps.

Only one person in two among the Haitian population of more than nine million people has access to clean drinking water, and only 19 percent have decent sanitation.

On Friday, Ecuadoran President Rafael Correa became just the second foreign leader to visit Haiti since the quake, lending his voice to international calls for more emergency relief and assistance with reconstruction.

"This is a tragedy, a humanitarian tragedy. Haiti at this moment represents the pain of victims but also hope," Correa said.

Haitians living in sprawling makeshift camps in the ruins of Port-au-Prince and elsewhere complain that the flood of international aid arriving in the country is trickling down too slowly.

Many are trying to rebuild their lives, with marketplaces springing up on streets around the capital, even if business is tough.

"It's very hard -- there are not a lot of buyers but there are a lot of sellers," said 24-year-old Rose Gardy-Joseph, sitting next to a basket full of colorful sweets, soft cheese and napkins.

But survivors also face rising insecurity, with thousands of criminals on the loose after the main jail collapsed in the quake and reports of rape and violence plaguing the weak and vulnerable.

The deputy head of the UN mission in Haiti, Anthony Banbury, said the United Nations did not want huge tent cities later turning into slums where there was poor sanitation, no security and child abuse.

The United Nations, along with aid agencies and security forces, must "do things smart, as well as fast, and that's a big challenge for us now," Banbury said.

The US State Department said it was spearheading a coordinated effort together with UNICEF, the Haitian government, the Red Cross and other agencies to combat the potential trafficking of children.

The aid effort has also been dogged by complaints over a lack of coordination between UN officials, the 20,000 US forces in Haiti, and a swarm of aid groups helping the country.

There were no signs of further survivors beneath the rubble after a 16-year-old girl was pulled alive from the ruins Wednesday after surviving 15 days without any food or water.

Rebuilding the western hemisphere's poorest nation could take decades, said Edmond Mulet, the acting head of the UN mission in Haiti, whose predecessor was killed in the quake.

"I think this is going to take many more decades than only 10 years and this is an enormous backwards step in Haiti's development. We will not have to start from zero but from below zero," Mulet told the BBC.

burs-dk/sah

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