"Nearly a dozen children have been admitted to a field hospital ... from a nearby camp", said a doctor who visited the clinic in Hattian Bala, 45 km (30 miles) southeast of Muzaffarabad, the hard-hit capital of Pakistani Kashmir.

The doctor, who works for an international agency but declined to be identified as he was not authorised to speak on the issue, said a 10-month old boy had died of measles on Thursday.

Ministry of Health officials were not immediately available for comment.

The UN Children's Fund has vaccinated hundreds of thousands of people since the quake struck but agency paediatrician Sajjad Gillani, confirming the outbreak at the camp, said some children might have been missed in the drive.

"The disease has possibly broken out because that particular camp might not have been covered during the immunisation campaign," Gillani said.

The Oct. 8 earthquake killed more than 73,000 people and left about three million homeless.

Government authorities and aid agencies are racing to try to get adequate shelter and food to survivors, many of whom have chosen to stay and try to rebuild ruined mountain homes rather than head down to tent camps in valleys.

The United Nations has received, or been pledged, less than half the more than $500 million it is seeking for a six-month emergency operation and agencies say they will have to curtail their work unless they get more help.

The head of the UN food agency said at the weekend it had enough food to keep hundreds of thousands of survivors fed through the winter but it badly needs money to keep air operations running.

A World Health Organisation official said his agency would run out of medical supplies in two months if did not get more funding.

"We'll be needing more and more medicines to prevent deaths from pneumonia and possible outbreaks," said Khalif Bile, director of the WHO mission in Pakistan.

"If we don't get the money the health care of the population will not be as comprehensive as we would like."