The Associated Press / Khaterine Roa cries as members of the Los Angeles County Fire Department search for survivors at a building that collapsed during the earthquakes that struck La Guaira, Venezuela, on Tuesday.

CARACAS, Venezuela — Doctors said Wednesday they feared the aftermath of Venezuela’s devastating twin earthquakes could trigger a widening medical crisis marked by untreated injuries, infectious diseases and a healthcare system already on the brink.

Thousands of displaced Venezuelans are sleeping in crowded shelters or outside without access to clean water amid dismal sanitary conditions following the June 24 earthquakes which officials say killed at least 2,295 and left more than 11,000 injured.

Aid workers said the aftermath of the quakes has become a major medical crisis that, unless quickly controlled, would take more lives in the days and weeks ahead. The emergency has laid bare Venezuela’s chronic shortage of doctors, the result of years of economic crisis, underfunding and emigration.

“The issue we foresee just around the corner is the infections that patients who have been exposed to the disaster for the longest time might bring,” said Eugenio Cova, the head of the trauma unit at Hospital del Oeste Dr. Jose Gregorio Hernandez in Caracas, the capital. “We’ve already gone through a period of complex trauma — which will continue to occur — but now it’s complicated by infections.”

Aid workers also warn that the extensive damage to infrastructure could fuel outbreaks of diseases in the hardest-hit communities.

“It’s very hot and there’s a lot of concern about potential vector-borne diseases,” said Veronique Durroux, the U.N. humanitarian agency spokesperson for Latin America and the Caribbean. “Waste management is an issue. Debris management, when you see the scale of devastation, it’s very concerning.”

The United States had 900 military personnel currently on the ground to support relief and rescue operations as of Wednesday, Steven McLoud, a U.S. Southern Command spokesperson, told The Associated Press.

The military has repaired an earthquake-damaged runway at the country’s main international airport that serves Caracas to allow for the arrival of humanitarian assistance and stationed naval assets off the coast to receive airlifted survivors. An additional 100 people from the U.S. State Department have been sent to aid those efforts, McLoud said.

So far, the Trump administration has offered Venezuela $300 million in assistance channeled through aid groups and the United Nations. But that’s just a fraction of the post-earthquake aid the country needs: Material damage from the quakes is estimated at over $6.7 billion, according to satellite analysis by the U.N. Development Program.

Fifty other international teams have arrived in recent days to help with search-and-rescue operations, including from countries like Ecuador and Israel that don’t have diplomatic relations with Venezuela.