# African Snail: Giant Land Snail Facts and Risks

The giant African snail, now classified as *Lissachatina fulica* and formerly known as *Achatina fulica*, is one of the world's most destructive invasive land mollusks and an important intermediate host for nematodes that cause disease in people and animals, including the rat lungworm *Angiostrongylus cantonensis* [1][2][3]. The single most important fact for pet owners and the public is that this snail can carry infective larvae in its tissues, and its mucus and feces can also be a source of infection, so bare-hand contact with a giant African land snail or its slime trail is a genuine health risk, particularly where the rat lungworm is established [2][4][3].

This article covers the biology of the species, the parasites it transmits, the routes of exposure that matter most, and why the giant African land snail is a quarantined or notifiable pest in many parts of the world. It does not provide deworming doses or treatment protocols, and it deliberately avoids promoting this species as a pet. If you find one, the practical answer is the same whether you keep reptiles, dogs, or nothing at all: do not touch it with bare hands, and report it to the appropriate agricultural authority.

## What Is the Giant African Snail?

<figure class="article-figure">
  <img src="https://upload.wikimedia.org/wikipedia/commons/8/8e/Lissachatina_fulica_shells_collected_in_southeast_Brazil.jpg" alt="Two Lissachatina fulica giant African snail shells collected in Brazil" loading="lazy" decoding="async" width="1000" height="779" />
  <figcaption>The giant African snail, Lissachatina fulica, is named for its large, conical, banded shell. Image: Mário NET, CC BY-SA 4.0, via <a href="https://commons.wikimedia.org/wiki/File:Lissachatina_fulica_shells_collected_in_southeast_Brazil.jpg" rel="noopener noreferrer">Wikimedia Commons</a>.</figcaption>
</figure>

*Lissachatina fulica* is a large pulmonate land snail in the family Achatinidae, native to East Africa and now spread across tropical and subtropical regions worldwide [5]. It is the largest terrestrial mollusk species, and its combination of a voracious appetite, wide environmental adaptability, high growth rate, and high reproductive capacity has made it a successful invader across Southeast Asia, Japan, the western Pacific islands, China, parts of the Caribbean, South America, and the southern United States [6][7][8].

Adults can reach up to roughly 17 cm in shell length, which places them among the largest land snails a homeowner is likely to encounter [2]. The species is a hermaphrodite, meaning each individual carries both male and female reproductive organs. A single snail can therefore found a new population without a mate, laying clutches of approximately 100 to 400 eggs several times per year. That reproductive output is the core reason eradication is so difficult once the giant African land snail is established in an area.

The snail has a chromosome-level genome assembly that has been used to study its invasive biology, and its genome is large (roughly 2.12 Gb estimated, with a high repeat content) [6]. This genomic work matters because it supports research into control methods and into how the snail interacts with the parasites it carries.

### Behavior and Ecology

Research on boldness, a personality trait defined as the propensity to take risks, shows that boldness in adult *Lissachatina fulica* is associated with specific shell shape variation, including a more deflated body whorl, a smaller, rounder aperture, and greater shell slenderness [9]. That association accounted for a modest share of total shell shape variation. In juveniles, no such link was found. The practical implication from the authors is that size-based management interventions may exert limited behavioral selection pressure on juveniles, while adult morphology-behavior syndromes could be targeted in control programs, contingent on detectability and capture efficiency [9].

The giant African snail is also coprophagic, meaning it will feed on feces. In a multiple-choice feeding study, feces made up about 5.9 percent of the diet of *L. fulica*, less than the slug *Parmarion martensi* (11.6 percent) and *Veronicella cubensis* (7.8 percent) but more than *Laevicaulis alte* (5.1 percent) [4]. This matters directly to parasite transmission. Feeding on rat feces is one way a snail encounters *A. cantonensis* larvae, which are shed in the feces of infected rodents, the parasite's definitive hosts [4][10]. The correlation between feces preference and rat lungworm prevalence across species was weakly positive in that study [4].

## The Parasite Problem: Rat Lungworm and Related Nematodes

*Angiostrongylus cantonensis*, the rat lungworm, is the parasite that gives the giant African snail its public-health significance. It is a nematode that lives as an adult in the pulmonary arteries of rodents, which are the definitive hosts, and it uses non-marine gastropods as intermediate hosts [11][3]. The giant African land snail is considered one of the most important intermediate hosts worldwide [11][3].

When a snail ingests infective first-stage larvae from rodent feces, the larvae develop through stages inside the snail. Third-stage larvae, the infective stage for the next host, accumulate in snail tissues [11][12]. If a person or animal eats an infected snail, or consumes raw produce contaminated by an infected snail or its slime, the larvae can migrate to the central nervous system. In people, this causes eosinophilic meningitis or meningoencephalitis, an emerging zoonosis that is the leading cause of human eosinophilic meningitis globally [11][7][10]. In dogs that eat snails or lick snail slime, the same parasite can produce neurological disease.

The rat lungworm is not the only nematode carried by this snail. A comprehensive review covering 1965 to 2021 identified 11 nematode species in association with *A. fulica* across 21 countries, with the most common associations being *A. cantonensis* and *Aelurostrongylus abstrusus* [3]. *Aelurostrongylus abstrusus* causes pneumonia in cats (feline aelurostrongylosis) [13][3]. Other metastrongyloid lungworms recovered from this snail include *[Angiostrongylus vasorum](/knowledge/parasites/pet-parasites/angiostrongylus-vasorum)*, *Troglostrongylus brevior*, and *Crenosoma vulpis* [14].

### Why Lungworm Larvae Survive Inside the Snail

The giant African snail has potent innate immune defenses, including phagocytic hemocytes that can deploy reactive oxygen species and lectins for non-self recognition, a serine protease-dependent coagulation response that has not been observed in other gastropod taxa, and antimicrobial proteins such as achacin [2]. Even so, lungworm larvae can evade or tolerate these defenses.

Experimental infection of *L. fulica* with *A. vasorum* larvae reached recovery rates of up to 49.7 percent, and larvae showed organ tropism for the lungs and the foot muscle tissue [15]. In some snails, larvae were ensnared by recruited hemocytes and formed granulomas, while in others the hemocyte response was barely detectable [15]. This variation suggests that the outcome of infection depends on the individual snail's immune response.

A separate study of *A. cantonensis* in *L. fulica* showed third-stage larvae associated with granuloma formation 37 days after experimental exposure, illustrating the complex balance between snail and parasite [11]. The snail's immune reaction to *A. vasorum* antigen includes a time-dependent increase in hemocyte reactive oxygen species production and the formation of invertebrate extracellular phagocyte trap-like structures in response to larvae [16]. Work in this area remains sparse, and the authors of that study note that knowledge of gastropod innate immune reactions is still limited [16].

### The Energy Cost of Infection

Infection is not free for the snail. Research shows that *A. cantonensis* infection depletes polysaccharide stores in *A. fulica*, compromising the snail's energy balance [2]. This is a reminder that host-parasite relationships are dynamic, and that a heavily infected snail may behave or survive differently than an uninfected one.

## Risk Route Versus Host: A Practical Table

The following table summarizes the main ways people and animals are exposed to rat lungworm and related nematodes associated with the giant African snail. It is organized by route of exposure and the host affected, based on the cited literature.

| Risk Route | Main Host Affected | Typical Scenario | Key Organism of Concern |
|--|--|--|--|
| Eating raw or undercooked infected snail | Humans, dogs | Intentional consumption, accidental ingestion, garden produce with a small snail | *A. cantonensis* [11][3] |
| Licking or mouthing snail slime | Dogs, cats | Pet noses or licks a slime trail on pavement, plants, or garden surfaces | *A. cantonensis* [2][4] |
| Contact with snail mucus or feces | Humans | Bare-hand handling, gardening, children playing with the snail | *A. cantonensis* [2][4] |
| Eating produce contaminated by snail | Humans | Unwashed lettuce or greens from a garden with snails | *A. cantonensis* [11] |
| Eating infected snail | Cats | Hunting or scavenging snails | *A. abstrusus*, *T. brevior* [13][14][3] |
| Eating infected snail | Dogs | Hunting or scavenging snails | *A. vasorum*, *C. vulpis* [14][15] |
| Rat feces as food source for snail | Snail becomes infected | Snail coprophagy in areas with infected rats | *A. cantonensis* [4][10] |
| Empty snail shells holding water | Humans and pets indirectly | Mosquito breeding in discarded shells near homes | *Aedes* and *Limatus* mosquitoes [17] |

A few points on this table deserve emphasis. First, the rat lungworm is not transmitted by simple touch alone in the sense of a skin infection, but contact with mucus or feces from an infected snail can contaminate hands, and hand-to-mouth transfer is a documented exposure pathway [2][4]. Second, slime can remain infective on surfaces. Third, the lungworms that affect dogs and cats are different species from the one that causes human eosinophilic meningitis, but the same snail can carry all of them [14][3].

## The Public Health Picture

*Angiostrongylus cantonensis* is considered the main pathogen responsible for eosinophilic meningitis in humans, and its distribution follows the dispersal of its intermediate hosts, especially *A. fulica* [7][12]. Cases in the French Caribbean territories and northern South America appeared in Martinique in 2002, Guadeloupe in 2013, and French Guiana in 2017, and molecular work confirmed the recent introduction of both the parasite and the snail into Guadeloupe [7].

In the United States, *A. cantonensis* was identified in *Achatina fulica* in Miami, Florida, indicating that rat lungworm is established in Florida as well as Louisiana [8]. The parasite has also been found in nonindigenous apple snails in the New Orleans area [8]. In mainland Spain, a surveillance study of 407 rats between 2022 and 2025 found only two infected black rats, both from Valencia, suggesting low prevalence in that region but confirming the parasite's presence in Europe [10].

The clinical picture in people is severe enough that the parasite is treated as an emerging zoonosis in multiple countries [11][7]. Neurological disease from rat lungworm can occur in dogs that eat snails or lick slime, and because dogs can be exposed outdoors without owners realizing it, prevention focuses on limiting access to snails and their slime.

### A Second Mosquito-Related Risk

Empty giant African snail shells can serve as mosquito breeding sites. A field study in Cali, Colombia, found that shells larger than 100 mm had high breeding potential, with the dominant species including *Limatus durhamii*, *Aedes albopictus*, and *Aedes aegypti* [17]. Shells measuring less than 60 mm had limited breeding potential [17]. This is a secondary but real public health concern: discarded shells near homes can become larval habitats for mosquito species that transmit dengue, chikungunya, and Zika. Removing and disposing of empty shells properly is a sensible control step in infested areas.

## Vulnerability in Dogs and Cats

Dogs and cats are at risk through different lungworm species, and the giant African snail is a competent intermediate host for several of them [13][14][3]. In a Colombian survey of 609 *L. fulica* snails collected from six municipalities, 53.3 percent of snails from Puerto Leguízamo were infected with *Aelurostrongylus abstrusus* larvae, and *Angiostrongylus vasorum* was also detected [14]. That level of infection in a single locality illustrates how heavily a local snail population can be involved in the transmission cycle.

The route of exposure matters for prevention. Dogs that eat snails or lick slime from surfaces where snails have crawled can pick up *A. vasorum* or *A. cantonensis* [14][15]. Cats that hunt or eat snails can pick up *A. abstrusus*, which causes pneumonia [13][3]. The giant African snail is not the only intermediate host, but it is a major one because of its size, its appetite, and its tendency to live in anthropogenic environments where pets also spend time [3].

Signs of lungworm disease in pets vary by parasite and by organ system, and no anthelmintic recommendations are given here because treatment decisions require a veterinarian who knows the species, the patient, and the local epidemiology. Owners in infested areas should discuss lungworm risk with their veterinarian and follow local guidance on parasite prevention.

## Handling and Safety: What to Do If You Find One

If you find a giant African land snail or a cluster of them, the safe response is to avoid bare-hand contact. Wear gloves, avoid touching your face, and wash your hands thoroughly with soap and water afterward. This applies to the snail itself, its mucus, its slime trail, and its feces [2][4].

The mucus and feces of the giant African snail can carry infective larvae, and handling requires gloves and hand washing. This is not a hypothetical concern. Rat lungworm larvae have been recovered from snail tissue in many studies [3], and contact with contaminated slime or feces is a recognized exposure route. Children and anyone who gardens barefoot or with bare hands are at particular risk in areas where the snail is established.

Do not eat wild snails. Do not let pets eat wild snails. Do not use wild snails as food, bait, or reptile feeders. Do not transfer a live snail to a new location, because that is exactly how this invasive species spreads. If local authorities ask for the snail to be reported rather than destroyed, follow their instructions. The snail is a notifiable or quarantined pest in many countries, and regulations vary by jurisdiction.

### Reporting and Regulatory Status

The giant African snail is treated as a major agricultural and public health pest across tropical and subtropical regions, and chemical molluscicides remain the dominant control method despite documented environmental risks [1]. Because of the ecological and health risks, many governments list it as a quarantined or notifiable pest, and some require reporting of sightings. If you are unsure of the rules where you live, contact your state or national department of agriculture before doing anything with a suspected giant African snail.

In the United States, the species is a serious concern for agriculture and public health, and its presence in Florida and Louisiana is documented in the context of rat lungworm [8]. The regulatory framework is not uniform across states, but the practical advice is consistent: report, do not release, and do not handle without protection.

## Control and Why Eradication Is Hard

Control efforts rely on physical removal, molluscicides, and increasingly on biological approaches. A review of biological control strategies published between 2010 and 2026 covers predatory invertebrates, vertebrate predators, parasitic nematodes, trematode parasites, entomopathogenic fungi, bacteria, viruses, and [RNA interference](/blog/guides/rna-interference) approaches, while critically evaluating host specificity, ecological risks, regulatory constraints, and field implementation challenges [1]. No single method is a complete solution, and integrated management is the current direction of the field [1].

The snail's reproductive biology sets a high bar for control. With clutches of roughly 100 to 400 eggs several times a year, and with hermaphroditism allowing any single individual to reproduce, a small surviving population can rebound quickly. Control programs therefore emphasize early detection, public reporting, and preventing spread through movement of soil, plants, and debris that may contain eggs or juveniles.

There is also the matter of the snail's immune system. Because *L. fulica* has strong innate defenses, including hemocyte-mediated reactions and granuloma formation around larvae, some larvae are destroyed while others survive [16][2][15][11]. This variability complicates predictions about transmission risk from any single snail, and it is one reason surveillance relies on testing rather than visual inspection alone.

## Mucus: A Real Exposure Risk and a Research Curiosity

Snail mucus is often discussed in cosmetic contexts, and one study evaluated snail mucin from *Achatina fulica* combined with alginate hydrogel for cutaneous wound healing in a rat model, reporting faster wound closure and full healing by day 21 in the mucin and combination groups [18]. That finding is about a processed laboratory product in a controlled wound model, not about applying wild snail slime to a wound at home. With live wild snails, mucus is a potential carrier of infective larvae, and the risk of contamination outweighs any theoretical benefit [2][4].

The same mucus that makes the snail a concern for hygiene is also part of why the species is so invasive: it helps the snail move, retain moisture, and survive transport. This is a biological feature that supports spread, not a reason to handle the animal casually.

## How the Parasite Moves Through the Environment

The transmission cycle of *A. cantonensis* runs through rats, snails, and accidental hosts. Rats shed first-stage larvae in feces. Snails ingest the larvae, often through coprophagy, and the larvae develop to the infective third stage. When a person, dog, or other accidental host eats the snail or contacts infective material, the parasite can migrate to the nervous system [4][11][10]. The following flow shows the main chain of events and where human or pet exposure occurs.

```mermaid
flowchart TD
    A [Infected rat] --> B [Larvae shed in feces]
    B --> C [Snail ingests feces]
    C --> D [Larvae develop in snail]
    D --> E [Infective larvae in tissue and slime]
    E --> F [Human eats snail or contacts slime]
    E --> G [Dog eats snail or licks slime]
    F --> H [Eosinophilic meningitis]
    G --> I [Neurologic disease]
    E --> J [Produce contaminated]
    J --> F
```

## Common Myths and Questions About the Giant African Snail

Several inaccurate claims circulate about this species. One is that giant African land snails are safe to keep as pets. They are invasive, they can carry zoonotic parasites, and they are regulated as pests in many countries. Keeping or moving them can spread the species and the parasites it carries, which is why public health and agricultural agencies discourage it.

Another myth is that only eating a whole snail can cause infection. Contact with slime and feces is also a route of concern, which is why gloves and hand washing are recommended [2][4]. A third myth is that the snail is only an agricultural problem. The medical and veterinary literature shows it is an intermediate host for multiple nematodes of importance to both human and animal health [13][14][3].

A fourth misconception is that freezing or rinsing produce is always enough to remove risk. While washing produce is a basic food safety step, the presence of small snails or slime on garden greens is a known route of exposure, and the safest approach in infested areas is to inspect and wash produce carefully and to keep snails out of garden beds where possible [11].

## What Is Still Uncertain

Several important questions remain open. The precise contribution of mucus and feces to human infection, relative to eating whole snails, has not been fully quantified. The authors of studies on snail coprophagy describe a weakly positive correlation between feces preference and rat lungworm prevalence, which suggests the relationship exists but is not simple [4]. The immune response of *L. fulica* to lungworm larvae varies greatly between individual snails, and researchers continue to call for more studies on hemocyte-derived reactions and organ tropism [16][15].

Biological control remains an active research area with unresolved questions about host specificity and ecological risk [1]. And although the parasite's presence in Europe has been confirmed in rats in Spain and in snails in the Caribbean, the full extent of its distribution in new regions is still being mapped [7][10].

## Limitations and When to Contact a Veterinarian

This article is educational and is not a substitute for veterinary diagnosis or treatment. Individual cases vary, and a veterinarian who can examine the animal and review its exposure history should guide any decision about testing or treatment.

Contact a veterinarian promptly if a dog or cat is known or suspected to have eaten a snail, licked snail slime, or had access to areas where giant African snails are present and the pet develops neurological signs such as wobbliness, tremors, head tilt, altered behavior, or seizures. Also seek veterinary care for persistent coughing, difficulty breathing, or unexplained weight loss in a pet with possible snail exposure, because lungworm disease can affect the heart and lungs [14][3]. For people, contact a physician if anyone in the household handled a giant African snail with bare hands, ate an unidentified snail, or ate unwashed produce from an area where the snail is established, especially if headache, neck stiffness, nausea, or neurological symptoms appear. Report suspected giant African snail sightings to the appropriate agricultural authority rather than handling the animal yourself.

## Frequently Asked Questions

### What is the giant African snail?

The giant African snail is *Lissachatina fulica*, a large invasive land snail native to East Africa and now found across many tropical and subtropical regions. It is an agricultural pest and an intermediate host for parasites that affect people and animals.

### Why is the giant African snail dangerous?

It carries nematodes including the rat lungworm *Angiostrongylus cantonensis*, which causes eosinophilic meningitis in people and can cause neurological disease in dogs. Its mucus and feces can also carry infective larvae, so handling it requires gloves and hand washing.

### Can my dog get sick from eating a snail?

Yes. Dogs that eat infected snails or lick snail slime can develop lungworm disease. Several metastrongyloid species have been recovered from the giant African snail, including *Angiostrongylus vasorum*, and the rat lungworm can cause neurological signs.

### Is the giant African snail legal to keep as a pet?

In many countries and US states it is a notifiable or quarantined pest, and keeping or moving it is restricted or prohibited. It is not a species to keep or transport, both because of its invasive potential and because of the parasites it can carry.

### How many eggs does a giant African snail lay?

It is a hermaphrodite that lays clutches of roughly 100 to 400 eggs several times a year. That reproductive output is a major reason the species is so difficult to control once established.

### Can I get rat lungworm from touching a snail?

Direct skin contact is not the main route, but contact with mucus or feces from an infected snail can contaminate your hands, and hand-to-mouth transfer is a recognized exposure pathway. Wear gloves and wash your hands thoroughly after any possible contact.

### What should I do if I find a giant African snail in my yard?

Do not handle it with bare hands. Keep children and pets away, wear gloves if you must move it, and contact your state or national agricultural authority for guidance on reporting and disposal. Do not move it to another location.

### Are there other parasites carried by this snail?

Yes. The literature documents 11 nematode species associated with the giant African snail, including *Aelurostrongylus abstrusus*, which causes pneumonia in cats, and several other lungworms of veterinary importance. Empty shells can also become breeding sites for mosquitoes.

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