Greenhouse-grown produce gains attention as Cyclospora investigation continues

As health officials continue investigating a multistate Cyclospora outbreak, greenhouse growers say controlled indoor farming can reduce some of the contamination risks associated with fresh produce.

GPB reports Cyclospora is a parasite spread through human fecal contamination, most often when polluted water comes into contact with fruits and vegetables. Because leafy greens like lettuce grow close to the ground, they can be especially vulnerable in traditional outdoor farming environments.

Steve Bradley, president of Cox Farms, said greenhouse operations use hydroponic systems that grow crops in nutrient-rich water instead of soil. He said the controlled environment limits exposure to surface water, wildlife and unnecessary human contact, reducing opportunities for contamination.

Health experts caution that investigators have not identified a single food responsible for the current outbreak. According to GPB, tracing Cyclospora is difficult because symptoms can take days or even weeks to appear, making it challenging to connect illnesses to a specific product. Unlike many foodborne illnesses that resolve on their own, Cyclospora infections often require prescription treatment and can last for months if left untreated.

The Centers for Disease Control and Prevention says more than 1,600 laboratory-confirmed Cyclospora infections have been reported in 34 states since the beginning of May, with thousands of additional reports still under review. Officials believe the actual number of infections is likely higher.

Bradley said greenhouse facilities also allow growers to quickly trace produce back to individual locations if contamination is detected, making recalls more targeted and efficient.