"Most of the bodies we have found are not intact, and that poses a danger for the rescuers. We have to be very careful to avoid contamination," Yusuf Latif, a spokesman for Indonesia's search and rescue agency, told AFP from Palu.
"We have vaccinated our teams, but we need to be extra cautious."
Thousands of survivors continued to stream out of Palu to nearby cities in the aftermath of the disaster.
Hospitals remain overstretched and short on staff and supplies.
In Karawana village, nurse Iyong Lamatowa can offer little more than antibiotics and painkillers to treat those flocking to a makeshift clinic with badly-infected wounds.
Project HOPE, a medical NGO, said only two of its 82 staff in Palu had reported for duty since the quake.
"We still don't know the fate of the clinic doctors, nurses and technicians who usually staff the clinic," the organisation said in a statement.
A floating hospital run by the Indonesian navy and docked in Palu has already assisted with the delivery of four babies.
One named her child Suharsi, after the ship that helped deliver her baby -- the KRI Dr Soeharso.
Short supplies
Survivors have ransacked shops and supply trucks in the hunt for basic necessities, prompting security forces to round up dozens of suspected looters and warn that they will open fire on thieves.
Hundreds of people Saturday rushed a truck transporting gas cylinders for cooking while a supermarket that opened for business under military guard refused to allow people inside, instead passing goods through the door.
A convoy of five hundred trucks laden with donated food, cooking oil and other essentials was on its way to Palu, agriculture minister Amran Sulaiman said in the devastated city on Saturday.
"Palu's ordeal is grief for all of us and that's why everyone is lending a hand to help," he said.
The United Nations said Friday it was seeking $50.5 million "for immediate relief" to help victims.
Getting vital supplies to the affected areas has proved hugely challenging, with the number of flights able to land at Palu's small airport still limited, leaving aid workers facing gruelling overland journeys.
Oxfam had sent water treatment units and purification kits to Palu and Swiss aid teams on the ground were providing drinking water and emergency shelter, both said in statements Saturday.
Indonesia sits along the world's most tectonically active region, and its 260 million people are vulnerable to earthquakes, tsunamis and volcanic eruptions.