As the road shook beneath him, Ko Zeyer sped past crumbled buildings, buckled roads and gaping sinkholes toward his hometown of Sagaing, the epicenter of the most powerful earthquake to hit Myanmar in a century.

B ANGKOK — The death toll from the massive earthquake that hit Myanmar nearly a week ago rose Thursday to 3,085 as search and rescue teams found more bodies, the military-led government said, and humanitarian aid groups scrambled to provide survivors medical care and shelter.

Extreme heat and heavy rain in Myanmar could cause disease outbreaks among earthquake survivors camping in the open, global aid bodies warned on Thursday.