Listeria is a gram-positive, rod-shaped bacterium that is found in contaminated foods. Listeria can be found in soil, which can lead to plant contamination. Animals who eat contaminated vegetation can become carriers. Therefore, it’s no surprise the bacterium has been found on and in a variety of food types including meats, dairy products, fruits, and vegetables.
The subspecies L. monocytogenes is a major human pathogen that can cause listeriosis, a rare bacterial disease with a 20% case-fatality rate. Pregnant women, newborns, the elderly, and immunocompromised adults are at the greatest risk of developing listeriosis. According to the CDC, listeriosis is usually a mild illness for pregnant women, but the fetus or newborn baby can develop a severe disease. Adults 65 years and older and people with weakened immune systems, can develop severe infections of the bloodstream (causing sepsis) or brain (causing meningitis or encephalitis).
To date, there have been no documented cases patients contracting Listeria from contaminated cannabis, but given the fact that the bacterium is found in soil, the cannabis plant could very well be at risk. And depending on how that plant is processed and ingested, certain populations could be at risk.
Labs can use our PathoSEEK® Microbial Safety Testing Platform to test for Listeria in a variety of cannabis matrices. The PathoSEEK Platform is the only method designed for and validated on cannabis flower, extracts, and a variety of infused products.