A mysterious form of kidney disease, known as chronic kidney disease of unknown etiology (CKDu) or Mesoamerican nephropathy, that has afflicted young and middle-aged agricultural workers in Central America and South Asia has now surfaced in Texas.
The condition baffles researchers because it strikes otherwise healthy adults without the traditional risk factors for kidney failure, such as diabetes or high blood pressure. According to the Centers for Disease Control and Prevention, chronic kidney disease can lead to serious complications including fluid buildup, high blood pressure, heart disease, stroke, and premature death.
Dr. Gokul Paidi, a family medicine physician, noted that CKDu typically affects young to middle-aged adults, more often men, who perform manual labor in hot, low-resource environments. He explained that while various regional kidney diseases have been documented historically, Mesoamerican nephropathy is the form now appearing in the U.S., first described among sugarcane workers in El Salvador and Nicaragua in the late 1990s.
Physicians in Texas have observed cases mirroring those seen in Central America, involving young men, often undocumented laborers from Mexico and Central America, working in demanding outdoor jobs like construction and roofing. These patients frequently present with kidney failure and sometimes dark-colored urine, but without the usual underlying causes. Records from Harris County hospitals indicate that approximately one in six emergency dialysis cases among uninsured or undocumented patients had no identifiable cause, consistent with CKDu. Some patients' reluctance to seek care due to immigration status complicates tracking and early detection.
Experts believe a combination of occupational and environmental factors contributes to the kidney damage. Repeated heat stress and dehydration from strenuous outdoor work are considered leading suspected drivers. These factors may be compounded by exposure to pesticides, smoke from burning sugarcane, potentially unsafe drinking water, and the use of over-the-counter NSAIDs for pain. Improving hydration, providing shade, reducing work hours, and shifting to earlier start times are suggested strategies to mitigate kidney damage.
CKDu is often called a "silent disease" as symptoms are not initially apparent. Many patients discover the condition during routine blood tests, often well before they experience typical signs of severe kidney disease such as fatigue, nausea, weakness, or shortness of breath. By the time symptoms manifest, many patients are already approaching end-stage kidney disease, and access to dialysis or transplants can be limited in resource-poor regions, increasing mortality rates.
There is no specific diagnostic test for CKDu; diagnosis is made by excluding other causes of chronic kidney disease and considering the patient's occupational and environmental history. Kidney biopsy is considered the closest to a gold standard but is not practical for widespread screening.
Management focuses on controlling blood pressure, preventing further kidney injury (including avoiding NSAIDs), and, in advanced stages, dialysis or transplantation. Some treatments, like ACE inhibitors, can potentially worsen kidney function in dehydrated individuals. Given the rapid progression and high mortality associated with the disease, experts recommend that individuals in agricultural or outdoor labor jobs, especially in hot climates, undergo kidney function checks at least twice a year. Simple blood tests for creatinine and urine tests for protein can detect early changes before symptoms arise.