Martins et al (2005)  note that only 6 of 60 selected atopic patients showed symptoms after snail ingestion which were asthma in all cases. All had CAP class 2 or higher with Helix aspersa. The primary sensitization in most patients was to mites with IgE cross-reactivity to snails which frequently did not cause clinical symptoms.
Wu & Williams (2004)  report a case of a patient known to be allergic to abalone who suffered fatal anaphylaxis after eating 3 snails.
Moneret-Vautrin et al (2004)  and Morrisset et al. (2003)  report that ingestion of snails resulted in 5 of 107 cases of severe food allergy in 2002. Severe asthma was again observed as a symptom and all 5 patients were sensitized to dust mites.
Asturias et al (2002)  describe the symptoms of patients following snail ingestion as including asthma, pruritus, facial oedema and gasteroinstinal symptoms. Sera from 22 patients with at least 2 symptoms, positive SPT and RAST were chosen for allergen characterization.
Longo et al (2000)  describe a case of specific-food-dependent exercise-induced anaphylaxis after eating snails in a child sensitive to house-dust mites. He developed chest pain, bronchial constriction that did not respond to salbutamol, dizziness, urticaria, vomiting, cyanosis, and finally collapse. Taken to an emergency department, he eventually developed respiratory failure, which required intubation, and a seizure. He was maintained in mechanical ventilation for 12 h.
Vuitton et al. (1998)  report the symptoms of 7 children as erythema and swelling at the injection site of immunotherapy; anaphylactic shock, cough and facial oedema; pruritis, asthma and wheals on the arms; pruritis, asthma, wheals, erythema, pain and swelling of the arms; asthma and anaphylactic shock; facial oedema, asthma, urticaria and anaphylactic shock; malaise, asthma, rhinitis, urticaria.
Van Ree et al. (1996)  report a group of 28 patients with combined snail and dust mite allergy who all reported asthma after snail ingestion and who had asthma and/or rhinitis associated with dust mites. Urticaria was a symptom of 13 patients and there were 2 cases of anaphylaxis after snail ingestion while symptoms with dust mites were restricted to asthma and/or rhinitis.
Grembiale et al (1996)  describe a case of asthma associated with eating snails.
Didier et al. (1996)  report 4 patients who reacted to snails with asthma in 2 cases, Quincke's oedema (laryngeal oedema) in one case and anaphylactic shock in one case.
De Maat-Bleeker et al. (1995)  report a single case of anaphylaxis after snail ingestion in a dust mite sensitized patient.
Pajno et al. (1994)  reported cough and asthma in 11/15 children, with known asthma and mite allergy, after open oral challenges with 30 g of cooked snails. 3 children also showed cutaneous symtoms.
Banzet et al. (1992)  reported 12 patients, with known respiratory dust mite allergy, who reacted following eating snails. In 7 cases this involved a typical asthma attack (5 times) or asthmatiform dyspnea (3 times), in 2 cases severe anaphylaxis and in 5 cases an erythematous reaction of the skin with wheals and subcutaneous tissue of the region of the arm in which acaris (dust mite) desensitisation injections had been administered during previous years.
Oehling et al. (1992)  note that allergic reactions following eating snails tends to involve asthma and rhinitis.
Ardito et al. (1990)  report 14 patients with asthma on snail ingestion and sensitization to dust mites.
de la Cuesta et al. (1989)  report 10 patients of whom 8 showed primarily respiratory symptoms.
Amoroso et al. (1988)  report that the symptoms were asthma after snail ingestion in their snail allergic subjects.
Palma Carlos et al. (1985)  report asthma associated with snail ingestion.