Biomedical subjects

Anne L Wright

Publications and source records attributed to Anne L Wright.

22 records · Page 2Linked to original sources

PubMed2002

Influence of attendance at day care on the common cold from birth through 13 years of age.

OBJECTIVE: To describe trends in the occurrence of the common cold during the first 13 years of life among children who attended different childcare settings early in life. DESIGN: The Tucson Children's Respiratory Study involves 1246 children enrolled at birth and followed up prospectively since May 1980 through October 1984. Children with data regarding day care use during the first 3 years of life were included in this investigation (n = 991). Parents reported the occurrence of frequent (> or = 4) colds during the past year by questionnaire when each child was 2, 3, 6, 8, 11, and 13 years of age. Child care at home (no unrelated children), at small day care (1-5 unrelated children), or at large day care (> or = 6 unrelated children) was reported retrospectively by parental questionnaire when the children were approximately 6 years old. RESULTS: After adjusting for potential confounding variables, compared with children at home those in large day care had more frequent colds at year 2 (odds ratio [OR], 1.9, 95% confidence interval [CI], 1.0-3.4; P =.04), less frequent colds at years 6 (OR, 0.3, 95% CI, 0.1-0.9; P =.02) through 11 (OR, 0.4, 95% CI, 0.1-1.2; P =.09), and the same odds of frequent colds at year 13 (OR,1.0, 95% CI, 0.3-3.8; P =.95). In addition, compared with children in large day care for 1 year or less those attending large day care for more than 2 years had more frequent colds at year 2 (OR, 1.7, 95% CI, 1.0-3.0; P =.04), less frequent colds at years 6 (OR, 0.5, 95% CI, 0.2-1.1; P =.08), 8 (OR, 0.2, 95% CI, 0.1-1.0; P =.04), and 11 (OR, 0.3, 95% CI, 0.1-1.0; P =.05); and the same odds of frequent colds at year 13 (OR, 0.9, 95% CI, 0.3-2.9; P =.80). CONCLUSIONS: Attendance at large day care was associated with more common colds during the preschool years. However, it was found to protect against the common cold during the early school years, presumably through acquired immunity. This protection waned by 13 years of age.

Adolescent↗

PubMed2002

Epidemiology of asthma and recurrent wheeze in childhood.

To summarize, wheeze is common throughout childhood, although it decreases as children age. However, the characteristics of wheeze, its relations with asthma, and its risk factors all change with age. Longitudinal studies have shown that "transient early wheezing" predominates during the first years of life. The principal risks for this type of wheezing are largely mechanical, relating to small airways, and infectious, relating to the risk of becoming infected with respiratory viruses. Associated with passive exposure to cigarette smoke, exposure to other children, and not being breastfed, this form of wheezing was unrelated to increased airway liability or atopy in the child. For the majority of children, particularly those with low lung function at birth, wheezing with early LRIs is a benign condition, not associated with subsequent wheeze or risk for asthma. During the middle part of the first decade of life, wheezing appears to reflect a mix of infectious and allergic wheezing. By 6 yr of age, some children have already wheezed persistently. This group is more likely to have high total IgE levels, to be skin-test positive, and to be given a diagnosis of asthma. Further, their immunologic response to their early LRIs was consistent with a Th2 bias: persistent wheezers produced high levels of IgE, and did not demonstrate the normal pattern of decreased eosinophils. Nevertheless, the children who wheeze in middle childhood are a mixed group, with some being less allergic. Thus, although markers of allergy become increasingly important predictors of wheezing for the group as a whole, wheezing in middle childhood is not associated with later methacholine hyperresponsiveness (42). Finally, persistent allergic wheezing, usually associated with a diagnosis of asthma, predominates by the end of the first decade of life. Wheezing at this age is associated with methacholine responsiveness, peak-flow variability, and markers of atopy, such as total IgE and allergy skin-test response. Although children who wheezed early in life are more likely to wheeze later, early wheeze does not increase the risk of atopy, suggesting that early LRIs are markers of increased risk rather than causes. The gender differences in wheeze disappear, with boys becoming less likely to wheeze and to have asthma, whereas both conditions appear to increase in girls. Finally, some of the risk factors for early LRIs, such as exposure to other children in infancy, appear to be associated with protection from later allergic wheezing. Clearly, asthma and wheeze during childhood are complex entities, presenting with different characteristics at different ages, and implicating varied and changing causes. Genetic factors are important determinants of the intermediate phenotypes. However, environmental factors operating at different developmental stages also appear to influence the development of asthma. Additional research regarding these relationships is essential, both to elucidate possible causal mechanisms and to provide insight into the primary prevention of asthma.

Adult↗

PubMed2002

Analysis of epidemiological studies: facts and artifacts.

Cohort studies have provided the foundation for much of our knowledge of childhood asthma. Four important lessons have been learned from these longitudinal studies: that asthma is a complex disease, encompassing many phenotypes; that it is linked to the development of the immune system and respiratory tract in the first years of life; that early life events strongly affect the development of asthma risk and that relationships between certain exposures and asthma risk are age dependent. The Tucson Children's Respiratory Study is used to exemplify these lessons and to illustrate the advantages of cohort studies in investigating a complex disease.

Animals↗

PubMedDate not supplied

Is there a common cold constitution?

OBJECTIVE: Constitutional factors might play a role in the susceptibility to clinical illness during the common cold. This study seeks to determine if the likelihood of developing frequent common colds persists during childhood. DESIGN: The Tucson Children's Respiratory Study involves 1246 children enrolled at birth and followed prospectively since 1980 and 1984. Parents reported the occurrence of frequent (> or =4) colds during the past year by questionnaire at 2, 3, 6, 8, 11, and 13 years of age. Blood for ex vivo interferon-gamma responses was obtained at 9 months and 11 years of age. RESULTS: After adjustment for potential confounding variables, children with frequent colds at year 2 or 3 were twice as likely to experience frequent colds at year 6 (relative risk [RR], 2.8; 95% confidence interval [CI], 2.1-3.9), year 8 (RR, 2.6; 95% CI, 2.1-3.3), year 11 (RR, 2.4; 95% CI, 1.8-3.1), and year 13 (RR, 2.1; 95% CI, 1.4-3.3) compared with children who had infrequent colds at years 2 and 3. At 9 months of age, children who ultimately experienced persistent frequent colds had lower interferon-gamma titers than children without persistent frequent colds (3.05 +/- 1.61 vs 3.74 +/- 1.39, P =.016); this finding persisted at 11 years of age. CONCLUSION: These data suggest the existence of a common cold constitution, whereby some children are more susceptible to infection and/or the expression of clinical symptoms when infected than are other children.

Adolescent↗