In tropical countries, land snails are an important source of food. However, the risks of foodborne diseases associated with consuming them are often poorly quantified.
Giant African Land Snail
Public Health Risks in Cameroon
In Cameroon, data on foodborne pathogens in snail meat are lacking, and their role in causing enteric diseases in the local population is unknown. A study conducted in Cameroon revealed alarming findings:
- 57%-86% of snails sampled contained Campylobacter spp., Yersinia spp., Listeria spp., Salmonella spp., or Shiga-toxigenic Escherichia coli.
These pathogens are associated with many foodborne outbreaks in developed countries, such as the United States. The high prevalence of Campylobacter spp. (75.37%) and Listeria spp. (86.10%) may be linked to free-range poultry farming practices and the snails' direct contact with soil and decaying vegetation.
Sampling Locations and Methods
Live snails were collected from three locations in Buea, Cameroon, between June and October 2019:
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- Persons’ homes (9 PM to 5 AM on rainy nights)
- Arable land (during the day)
- Local markets (weekly from snail vendors)
The samples were then stored at -80°C before DNA extraction and PCR analysis to detect the presence of Shiga toxin-producing Escherichia coli, Campylobacter spp., Salmonella spp., Listeria spp., and Yersinia spp.
Prevalence of Foodborne Pathogens
The study found that every sample examined contained at least one pathogen, with most samples containing multiple pathogens. This highlights the significant public health risks associated with handling and consuming raw or undercooked edible snails collected from natural habitats in Cameroon.
Table: Prevalence of Foodborne Pathogens in Land Snails in Buea, Cameroon (June-October 2019)
| Pathogen | Prevalence |
|---|---|
| Campylobacter spp. | 75.37% |
| Listeria spp. | 86.10% |
| Salmonella spp. | 57%-86% |
| Shiga-toxigenic Escherichia coli | 57%-86% |
| Yersinia spp. | 57%-86% |
Traditional Practices vs. Scientific Findings
Local residents often believe that washing snails with aluminum sulfate or salt and lime, followed by boiling and stewing, can kill all microorganisms. However, studies have shown that substantial bacterial loads can remain in snail meat even after boiling, frying, smoking, and oven drying.
Escargot Preparation
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The Giant African Snail as an Invasive Species
The African Giant Snail (Achatina fulica) is one of the top 100 worst invasive species globally. Originating from East Africa, this snail has wreaked havoc in many tropical and subtropical regions worldwide. It poses a threat to over 500 plant species and more than 20 crops, earning it the moniker "garden killer."
Health Risks and Parasites
While African Giant Snails are not inherently toxic, they can carry and transmit parasites such as the rat lungworm. The snails ingest rodent feces, which can harbor various bacteria. The mucus left behind by these snails also carries pathogens, and the larvae of the rat lungworm can survive in their feces for an extended period.
Why Is The Giant African Snail An Invasive Species? - Ecosystem Essentials
Global Invasion and Pet Trade
The giant land snail (Lissachatina fulica) is not only a widespread invader but also a popular exotic pet. This raises concerns about the risk of disease transmission, particularly the rat lungworm, which can cause eosinophilic meningitis in humans. Studies have shown that L. fulica can carry at least 36 pathogen species, two-thirds of which can infect humans.
Distribution of Giant African Land Snails
Pet Owners' Behavior
Research using social media data, specifically Instagram, revealed that giant snails are popular exotic pets in Europe. Many owners handle them with direct skin contact, increasing the risk of pathogen transmission. This highlights the need for public awareness and regulation of the trade and ownership of these snails.
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Recommendations and Control Measures
Given the health risks associated with Giant African Snails, it is crucial to take the following precautions:
- Avoid ingesting snails found in the environment.
- Wash vegetables thoroughly and soak them in a 1.5% sodium hypochlorite solution for about 30 minutes.
- Control snail populations through manual collection, wearing gloves or plastic bags for protection.
- Crush collected snails, cover them with quicklime, and bury them.
- Avoid using pesticides, as they can harm the soil and planting.
Conclusion
The consumption of giant African land snails poses significant health risks due to the presence of various pathogens and parasites. Public health awareness and proper handling and cooking practices are essential to mitigate these risks.
