Using bat guano as fertilizer for cannabis crops has led to fatal fungal infections in two cases, prompting doctors to warn against this practice. The popularity of bat guano as a “superfood” for cannabis cultivation raises concerns about the potential risks associated with its use.
Histoplasmosis, a lung infection caused by inhaling Histoplasma fungus spores, is typically contracted from environments rich in bird or bat droppings. While exposure often results in mild symptoms or no illness, severe cases can lead to life-threatening complications, particularly in individuals with weakened immune systems. The fungus thrives in soil enriched with animal droppings, and bats are known carriers, making their guano a potential source of infection.
Two recent cases highlight the danger of bat guano in cannabis cultivation. A 59-year-old man used commercially purchased bat guano as fertilizer, while a 64-year-old intended to use guano from a bat infestation in his attic. Both men developed severe histoplasmosis and ultimately succumbed to complications, despite medical treatment. Pre-existing health conditions may have contributed to the severity of their infections.
Histoplasmosis: A Rare but Serious Threat
Histoplasmosis, while relatively rare (3,000 to 7,000 annual cases in the U.S.), poses a significant threat to cannabis growers unaware of the potential dangers of bat guano. This “natural superfood,” rich in nitrogen and other compounds, is often promoted online for cannabis cultivation. However, the lack of regulation and testing for Histoplasma in commercially sold guano raises serious concerns.
The Growing Risk with Cannabis Legalization
With the increasing legalization and popularity of cannabis, the risk of histoplasmosis associated with bat guano use is likely to rise. Educating growers about the potential hazards and implementing testing or risk mitigation strategies for commercially sold guano is crucial to prevent future infections.
Preventing Histoplasmosis in Cannabis Cultivation
Preventing histoplasmosis requires awareness among both physicians and cannabis growers. Early diagnosis is critical, and preventive measures should be emphasized. Testing commercial bat guano fertilizers for Histoplasma capsulatum before sale is essential. Where testing isn’t feasible, effective risk mitigation strategies must be implemented.
In conclusion, while bat guano might seem like a beneficial fertilizer for cannabis, its use carries the risk of a potentially fatal fungal infection. Awareness, prevention, and regulation are key to safeguarding cannabis growers and preventing further tragedies.
