Effect of Early-Life Geohelminth Infections on the Development of Wheezing at 5 Years of Age.

Autor:	Cooper PJ; 1 Facultad de Ciencias Medicas, de la Salud y la Vida, Universidad Internacional del Ecuador, Quito, Ecuador.; 2 Laboratorio de Investigaciones FEPIS, Quininde, Esmeraldas Province, Ecuador.; 3 Institute of Infection and Immunity and., Chico ME; 2 Laboratorio de Investigaciones FEPIS, Quininde, Esmeraldas Province, Ecuador., Vaca MG; 2 Laboratorio de Investigaciones FEPIS, Quininde, Esmeraldas Province, Ecuador., Sandoval CA; 2 Laboratorio de Investigaciones FEPIS, Quininde, Esmeraldas Province, Ecuador., Loor S; 2 Laboratorio de Investigaciones FEPIS, Quininde, Esmeraldas Province, Ecuador., Amorim LD; 4 Instituto de Saude Coletiva, Universidade Federal da Bahia, Salvador, Brazil; and., Rodrigues LC; 5 Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom., Barreto ML; 4 Instituto de Saude Coletiva, Universidade Federal da Bahia, Salvador, Brazil; and., Strachan DP; 6 Population Health Research Institute, St. George's University of London, London, United Kingdom.
Jazyk:	angličtina
Zdroj:	American journal of respiratory and critical care medicine [Am J Respir Crit Care Med] 2018 Feb 01; Vol. 197 (3), pp. 364-372.
DOI:	10.1164/rccm.201706-1222OC
Abstrakt:	Rationale: Exposures to geohelminths during gestation or early childhood may reduce risk of wheezing illness/asthma and atopy during childhood in tropical regions. Objectives: To investigate the effect of maternal and early childhood geohelminths on development of wheeze/asthma and atopy during the first 5 years of life. Methods: A cohort of 2,404 neonates was followed to 5 years of age in a rural district in coastal Ecuador. Data on wheeze were collected by questionnaire and atopy was measured by allergen skin prick test reactivity to 10 allergens at 5 years. Stool samples from mothers and children were examined for geohelminths by microscopy. Measurements and Main Results: A total of 2,090 (86.9%) children were evaluated at 5 years. Geohelminths were observed in 45.5% of mothers and in 34.1% of children by 3 years. Wheeze and asthma were reported for 12.6% and 5.7% of children, respectively, whereas 14.0% had skin test reactivity at 5 years. Maternal geohelminths were associated with an increased risk of wheeze (adjusted odds ratio, 1.41; 95% confidence interval, 1.06-1.88), whereas childhood geohelminths over the first 3 years of life were associated with reduced risk of wheeze (adjusted odds ratio, 0.70; 95% confidence interval, 0.52-0.96) and asthma (adjusted odds ratio, 0.60; 95% confidence interval, 0.38-0.94) but not skin prick test reactivity. The effects on wheeze/asthma were greatest with later age of first infection, were observed only in skin test-negative children, but were not associated with parasite burden or specific geohelminths. Conclusions: Although maternal exposures to geohelminths may increase childhood wheeze, childhood geohelminths during the first 3 years may provide protection through a nonallergic mechanism. Registered as an observational study (ISRCTN41239086).
Databáze:	MEDLINE
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