Zoonotic helminth exposure and risk of allergic diseases: A study of two generations in Norway.
Clin Exp Allergy
; 48(1): 66-77, 2018 01.
Article
en En
| MEDLINE
| ID: mdl-29117468
ABSTRACT
BACKGROUND:
Animal and human studies indicate that definitive host helminth infections may confer protection from allergies. However, zoonotic helminths, such as Toxocara species (spp.), have been associated with increased allergies.OBJECTIVE:
We describe the prevalence of Toxocara spp. and Ascaris spp. seropositivity and associations with allergic diseases and sensitization, in 2 generations in Bergen, Norway.METHODS:
Serum levels of total IgG4, anti-Toxocara spp. IgG4 and Ascaris spp. IgG4 were established by ELISA in 2 cohorts parents born 1945-1972 (n = 171) and their offspring born 1969-2003 (n = 264). Allergic outcomes and covariates were recorded through interviews and clinical examinations including serum IgEs and skin prick tests.RESULTS:
Anti-Ascaris spp. IgG4 was detected in 29.2% of parents and 10.3% of offspring, and anti-Toxocara spp. IgG4 in 17.5% and 8.0% of parents and offspring, respectively. Among offspring, anti-Toxocara spp. IgG4 was associated with pet keeping before age 15 (OR = 6.15; 95% CI = 1.37-27.5) and increasing BMI (1.16[1.06-1.25] per kg/m2 ). Toxocara spp. seropositivity was associated with wheeze (2.97[1.45- 7.76]), hayfever (4.03[1.63-9.95]), eczema (2.89[1.08-7.76]) and cat sensitization (5.65[1.92-16.6]) among offspring, but was not associated with allergic outcomes among parents. Adjustment for childhood or current pet keeping did not alter associations with allergies. Parental Toxocara spp. seropositivity was associated with increased offspring allergies following a sex-specific pattern. CONCLUSIONS & CLINICAL RELEVANCE Zoonotic helminth exposure in Norway was less frequent in offspring than parents; however, Toxocara spp. seropositivity was associated with increased risk of allergic manifestations in the offspring generation, but not among parents. Changes in response to helminth exposure may provide insights into the increase in allergy incidence in affluent countries.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Ascariasis
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Ascaris
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Toxocara
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Toxocariasis
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Zoonosis
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Hipersensibilidad
Tipo de estudio:
Clinical_trials
/
Etiology_studies
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Risk_factors_studies
Límite:
Adolescent
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Adult
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Animals
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Child
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Female
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Humans
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Male
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Middle aged
País/Región como asunto:
Europa
Idioma:
En
Revista:
Clin Exp Allergy
Asunto de la revista:
ALERGIA E IMUNOLOGIA
Año:
2018
Tipo del documento:
Article
País de afiliación:
Estonia