The same climate pressures that threaten crop yields and accelerate soil erosion are quietly reshaping the disease landscape for farmworkers. Ticks, cyclospora, screwworm, and other parasites historically contained by winter freezes are expanding their range across agricultural regions, creating overlapping health crises in communities that already face barriers to basic medical care.
Farmworkers face daily exposure to parasites, pathogens, pesticides and other hazards, while climate change intensifies the risks, according to research and advocacy groups tracking occupational health in agriculture. Unlike equipment failures or commodity price swings, these threats are largely invisible to the policymakers and corporate leaders who shape American farming.
The Expanding Threat
Screwworm, a parasitic larva that infests living animal flesh, was once contained to southern border regions. As winter temperatures moderate across the agricultural belt, the insect is establishing populations further north and staying active longer into fall and spring. Tick populations are similarly expanding, carrying Lyme disease and other pathogens into regions where they were once rare.
Cyclospora, a parasitic infection spread through contaminated water and produce, has become a recurring summer hazard for farmworkers and consumers alike. The cooling-then-warming pattern of climate volatility extends the season when the parasite thrives.
The federal government has mobilized resources to contain screwworm in livestock herds, with U.S. Customs and Border Protection supporting sterile fly releases to suppress populations. This focus on protecting cattle profits masks a harder truth: farmworkers exposed to the same animals in dusty, crowded conditions receive a fraction of that coordinated response.
Why Farmworkers Are Invisible in Public Health
The farmworker health crisis exists in a blind spot. Agricultural workers don’t fit neatly into occupational-safety frameworks built for factories or construction sites. Many work across state lines, leaving no single agency responsible for tracking illness. Seasonal migrant workers often lack stable housing, health insurance, or consistent relationships with healthcare providers who understand farm-specific exposures.
Heat stress, pesticide exposure, contaminated water, and now parasitic disease converge on workers who lack basic protections. Heat relief standards remain unenforced or nonexistent in most states. Pesticide application standards rely on voluntary compliance and worker training that is often absent or conducted in languages workers don’t fully understand.
A farmworker bitten by a tick or infected with cyclospora often cannot afford to stop working, cannot identify the illness without access to healthcare, and cannot seek treatment without risking immigration scrutiny or job loss.
Climate as an Amplifier
The climate angle isn’t speculative. Warming winters mean parasites and disease vectors survive year-round in regions where they once died out seasonally. Extended warm seasons stretch pest life cycles and transmission windows. Drought followed by flooding creates ideal conditions for waterborne parasites like cyclospora to proliferate.
Agricultural workers, disproportionately Latinx immigrants in many regions, face compounding exposure: they work longer hours during peak seasons, have less autonomy over working conditions, and are more likely to live in housing that lacks safe water and sanitation. Climate impacts don’t strike all farmworkers equally; they follow the fault lines of labor exploitation and economic desperation.
What’s Being Missed
The Biden administration’s ag policy focused heavily on soil health and carbon sequestration, framing environmental restoration as a farmer-centered mission. The Trump administration’s deregulatory approach has systematically weakened water and pesticide protections that offer farmworkers marginal defense against contamination.
What’s absent from both: a recognition that farmworker health and climate resilience are inseparable. You cannot build a sustainable food system on the backs of workers whose health is collapsing.
Real reform would include:
- Mandatory health screening programs for farmworkers, with language-accessible education about emerging parasitic and tick-borne threats
- Enforceable heat and hydration standards tied to climate data
- Seasonal job protections so workers can seek medical care without risking employment
- Federal oversight of pesticide application, especially in the context of climate-driven pest proliferation
The Resistance Path
Some farmworker advocacy organizations, including the National Farmworker Ministry and regional migrant health networks, are beginning to document and organize around these threats. Farm labor unions have made occupational health a bargaining priority in recent contracts. Community health centers in agricultural regions are developing climate-adapted health literacy programs.
But these efforts remain underfunded and fragmented. There is no equivalent federal push for farmworker climate adaptation as exists for crop insurance or commodity support.
The question facing agriculture is whether the industry will continue treating farmworker health as an afterthought, or whether the escalating climate crisis will finally force a reckoning. Farmworkers didn’t create climate change. They’re simply the first to bear its cost.
For more on farmworker protections and climate impacts on agriculture, see our coverage of the H-2A wage ruling, the Salinas Valley food safety crisis, and federal threats to clean water protections.
