Six months after the Norfolk Southern train derailment and chemical fire that devastated East Palestine, Ohio, the first peer-reviewed research on exposed residents reveals their immune systems were still actively fighting and repairing damage from the toxic exposure.
The pilot study analyzed blood samples from residents who lived near the February 2023 crash site and compared them to a control group. Researchers discovered elevated red blood cell counts, higher hemoglobin levels, increased inflammation, and higher numbers of immune cells dispatched to attack and remove chemical compounds from the body. Residents also showed elevated levels of proteins designed to repair tissue damage, along with reduced numbers of infection-fighting cells.
Jessica Boersma, an East Palestine city council member and chiropractor who lived less than a quarter mile from the wreck, was heavily exposed during the immediate aftermath while coordinating with first responders. Her blood work showed signs of chronic inflammation and altered cell counts. In the months following the disaster, Boersma experienced gall bladder pain, irregular menstrual cycles, elevated cortisol levels, and a persistent itchy throat and nose.
"This pilot shows evidence that the bodies of those who lived in close proximity to the site were still fighting and repairing from a toxic exposure," said Erin Haynes, a University of Kentucky study co-author.
The derailment involved dozens of cars that caught fire near tankers carrying vinyl chloride. After concerns about a potential major explosion, officials conducted a controlled burn of the chemical. The resulting release left a potent chemical odor hanging over the town of 4,700 for weeks. Testing found dioxin levels as much as 14 times higher than EPA safety thresholds, along with volatile organic compounds and other hazardous substances.
Residents across East Palestine have since reported headaches, rashes, respiratory problems, and hormonal disruptions. Some of Boersma's patients described similar health concerns. She expressed relief at having clinical data to track: "I feel pretty normal now, but I'm interested in getting involved because I want proof, clinical and black-and-white data, that show health markers that I could follow. We have a starting point with this."
When regulators lifted the evacuation order in February 2023, they relied on air monitors that officials claimed showed no risks from volatile organic compounds. Public health advocates countered that the monitoring equipment may not have detected all harmful chemicals and byproducts in the complex exposure scenario.
Long-term exposure to VOCs like vinyl chloride triggers production of tissue repair proteins and is linked to increased inflammation and immune changes, the type of alterations visible in the East Palestine residents' blood work. Haynes noted that VOCs and toxicants can damage virtually every organ system, yet research remains sparse on how bodies defend themselves against and recover from chemical exposure.
"We really wanted to look at the body's ability to fight a toxicant or foreign substance," Haynes said. "It looks like their bodies were fighting an infection, but it was probably the exposure."
Stress also plays a significant role in immune dysregulation. East Palestine residents reported severe anxiety immediately after the wreck, which compounds the biological impact of chemical exposure.
The findings carry important caveats. Study authors emphasized that the patterns observed "do not prove that the train derailment caused the observed changes or that any individual has an illness or will develop future health problems." Not all study participants showed immune markers. Ron and Peggy Caratelli, who lived roughly eight-tenths of a mile away and evacuated for about a month, showed no signs of immune system impacts in their blood work.
Researchers plan to expand the investigation by testing larger groups of residents and first responders. These studies are part of a broader University of Kentucky-led initiative to track long-term health consequences for the East Palestine community.
Author James Rodriguez: "This pilot study fills a critical gap in understanding how chemical disasters affect human health, but the real test comes with the larger investigation ahead."
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