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Hospitalization for RSV Bronchiolitis Before 12 Months of Age and Subsequent Asthma, Atopy and Wheeze

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Hospitalization for RSV Bronchiolitis Before 12 Months of Age and Subsequent Asthma, Atopy and Wheeze STUDY POPULATION. Children aged 6 to 7 years who were living admitted to a hospital in the first 12 months with respi- in 3 cities (Bilbao, San Sebastian, and La Coruna) and 1 ratory syncytial virus (RSV)–proven bronchiolitis. province (Asturias) of the North Atlantic coast of Spain. STUDY POPULATION. Data from a large, population-based, METHODS. The International Study of Asthma and Aller- birth cohort (Avon Longitudinal Study of Parents and gies in Childhood (ISAAC) core and environmental Children) were used. questionnaires were used in 4 different centers of the METHODS. Outcomes considered were 12-month preva- Spanish North Atlantic coast. Bilbao, San Sebastian, and lence of wheeze at 2 ages (between 30–42 and 69–81 Asturias have a universal BCG immunization policy dur- months), cumulative prevalence of doctor-diagnosed ing the first days of life, whereas La Coruna discontinued asthma at 91 months, and skin-prick test–defined atopy this practice in 1989. Except for this center, immuniza- at 7 years. Multivariable logistic-regression models were tion coverage was Ͼ90%. Parents of children aged 6 and used to calculate odds ratios for outcomes adjusted for 7 years were surveyed from a random sample of schools potential confounders. of Asturias or all schools in the city district among the remainder of the centers. RESULTS. A total of 150 infants (1.1% of the cohort) were admitted to a hospital within 12 months of birth with RESULTS. The participation rate was Ͼ70%. After exclud- RSV bronchiolitis. The prevalence of wheezing was ing those children born outside Spain, there were 6762 28.1% in the RSV group and 13.1% in controls at 30 to immunized and 2828 nonimmunized. After adjusting for 42 months and 22.6% vs 9.6% at 69 to 81 months. The gender, age, smoking habits of the father and mother, cumulative prevalence of asthma was 38.4% in the RSV truck traffic near the household, presence of older and group and 20.1% in the controls at 91 months. Atopy younger siblings, and ownership of a cat or a dog during was found in 14.6% of those in the RSV group and in the first year of the child’s life, the adjusted odds ratios of 20.7% of the controls at 7 years. RSV bronchiolitis was the BCG-immunized children according to disease out- associated with subsequent wheezing between 30 to 42 come were 0.87 for asthma (95% confidence interval months (odds ratio [OR]: 2.3; 95% confidence interval [CI]: 0.76–1.00), 0.87 for hay fever (95% CI: 0.75–1.01), [CI]: 1.3–3.9) and 69 to 81 months (OR: 3.5; 95% CI: and 0.89 for atopic dermatitis (95% CI: 0.76–1.05). 1.8–6.6) and with the cumulative prevalence of asthma CONCLUSIONS. BCG immunization offers weak protection at 91 months (OR: 2.5; 95% CI: 1.4–4.3) but not with against atopic diseases in Spanish schoolchildren. atopy (OR: 0.7; 95% CI: 0.2–1.7). REVIEWER COMMENTS. BCG vaccination has received atten- CONCLUSIONS. In a population-based birth cohort, RSV tion because of its ability to provoke a T-helper (Th)1 bronchiolitis was associated with subsequent wheezing response. Many investigators have hypothesized that and asthma but not with the development of atopy by 7 vaccination with BCG may offer protection from Th2- years of age. skewed diseases such as asthma, allergic rhinitis, and REVIEWER COMMENTS. Because infants who have severe RSV atopic dermatitis. Although this study reveals that im- infection have recurrent wheezing later in life, RSV has munization with BCG offers weak protection against been suggested to be a risk factor for asthma. Some also asthma and allergic rhinitis in a homogeneous popula- postulate that early RSV infection may predispose chil- tion, it is important to remember that these diseases are dren to atopy; however, this has been controversial. multifactorial, with genetic and environmental influ- Henderson et al show in their large prospective cohort ences also impacting pathogenesis. that severe RSV infection requiring hospitalization is URL: www.pediatrics.org/cgi/doi/10.1542/peds.2006-0900I associated with wheezing but not atopy. These results Jennifer M. Maloney, MD indicate that RSV infection may be a risk factor for Scott H. Sicherer, MD nonallergic asthma. New York, NY URL: www.pediatrics.org/cgi/doi/10.1542/peds.2006-0900J Julie Wang, MD Hospitalization for RSV Bronchiolitis Before New York, NY 12 Months of Age and Subsequent Asthma, Atopy and Wheeze: A Longitudinal Birth Cohort Study Early Respiratory Infections, Asthma, and Henderson J, Hilliard TN, Sherriff A, Stalker D, Al Allergy: 10-Year Follow-up of the Oslo Birth Shammari N, Thomas HM. Pediatr Allergy Immunol. Cohort 2005;16:386–392 Nafstad P, Brunekreef B, Skrondal A, Nystad W. PURPOSE OF THE STUDY. To compare asthma and atopy out- Pediatrics. 2005;116(2). Available at: comes of children according to whether they had been www.pediatrics.org/cgi/content/full/116/2/e255 S6 BEST ARTICLES RELEVANT TO PEDIATRIC ALLERGY AND IMMUNOLOGY Downloaded from www.aappublications.org/news by guest on September 24, 2021 PURPOSE OF THE STUDY. As one dimension of the hygiene Exposure to Pets, and the Association With hypothesis, early infections may protect against the de- Hay Fever, Asthma, and Atopic Sensitization velopment of atopic disease. However, there are few in Rural Children long-term follow-up studies of the influence of early Waser M, von Mutius E, Riedler J, et al. Allergy. 2005; respiratory infections. This study investigates associa- 60:177–184 tions between early respiratory infections and diagnosed PURPOSE OF THE STUDY. To evaluate the effect of exposure to asthma, allergic rhinitis, and skin-prick sensitization in animals on the development of hay fever, asthma, and children at 10 years of age. atopy. STUDY POPULATION. A total of 2540 Norwegian children were STUDY POPULATION. Cross-sectional study of 2618 families of followed prospectively from birth to the age of 10 years Swiss, German, and Austrian decent, living in a rural in the Oslo Birth Cohort. location. Families were assigned to 1 of 2 categories: METHODS. Information on child’s health and environmen- farming and nonfarming. tal exposures, including experiences with respiratory in- METHODS. Information was collected by standardized ques- fections, was recorded at birth and at 6 and 12 months. tionnaire and interview. Mattress dust was collected and Current symptoms and “ever” doctor-diagnosed asthma measured for content of endotoxin and cat allergen. and allergic rhinitis were compared with these early life Specific immunoglobulin E levels to multiple common exposures. A subset of the cohort underwent skin-prick allergens and immunoglobulin G4 to cat were mea- testing. sured. RESULTS. “Ever” diagnosis of asthma was positively associ- RESULTS. Complete data were available for 812 children. ated with measures of early life infection. Current Among them, 319 were farmers’ children and 493 were asthma was related to lower respiratory tract infection nonfarmers’ children. In the entire group, early (Ͻ1- (adjusted odds ratio [aOR]: 2.1; 95% confidence interval year-old) and current exposure to cats was associated [CI]: 1.3–3.0) and croup (aOR: 2.3; 95% CI: 1.3–4.2) in with a reduced risk of wheezing and grass pollen the first year. ORs for allergic rhinitis and skin-prick sensi- sensitization. Current contact with dogs was inversely tization were smaller but “mainly positive.” Birth order and associated with hay fever, asthma, and sensitization to child care attendance at 1 year of age were not significantly cat allergen and grass pollen. Early exposure to dog associated with any of the studied outcomes. did not have any significant effects. When farm-ani- mal contact was controlled for, most of these associa- CONCLUSIONS. Early respiratory infections did not protect tions were weakened but were strongest in farmers’ against the development of atopic disease during the first children. 10 years of life. Rather, infections increased the risk for asthma at age 10. CONCLUSIONS. There was an inverse relationship between dog exposure and asthma, hay fever, and allergy. How- REVIEWER COMMENTS. The hygiene hypothesis has been used ever, much of this protective effect was explained by to explain an inverse relation between early-life infec- exposure to farm animals. tion and allergic disease. Although a number of studies have described the relationship of early childhood infec- REVIEWER COMMENTS. There are several studies that report tions and atopic disease, few have done so prospectively. pet exposure to be associated with a reduced risk for This study, with its ORs near 1 with narrow CIs, shows atopic disease. In this study, the primary outcome of a positive relationship of infections to atopy. Thus, it does decreased clinical manifestations of atopy was con- not support the view of protection with increasing infec- founded by exposure to farm animals. Although the tion, bringing to light that this relationship is not as simple exposure to pets did not show an overall statistically or direct as was first described. Additional prospective stud- significant association, the results approached signifi- ies with long-term follow-up are required to further define cance, and a larger study population may have re- this relationship. In addition, these results support previous vealed significant differences. Also, the study ulti- conclusions that early childhood infection may be associ- mately found that animal exposure is most likely to ated with an increased risk for future development of provide a protective effect when the total level of asthma. There continues to be many unanswered ques- exposure is highest (ie, those children exposed to pets tions regarding the risks in susceptible hosts.
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