[Show abstract][Hide abstract] ABSTRACT: OBJECTIVE: We evaluate the association of blood 25(OH)D 3 with Acute Respiratory Infection (ARI) severity in early childhood, hypothesizing that children hospitalized with ARI have lower levels of vitamin D.
Low vitamin D status is prevalent among NZ children with ARI.
Vitamin D deficiency was more frequent among children hospitalized for ARI, as compared to those with outpatient ARI.
Vitamin D status may be a contributing factor to the severity of ARI amongst NZ children.
European Respiratory Conference 2014, Munich; 09/2015
[Show abstract][Hide abstract] ABSTRACT: β-(1,3)-glucan exposure from household dust has been shown to be associated with respiratory symptoms and thus is increasingly being measured in epidemiological studies. Various factors are known to influence its measurement; however, no studies have assessed the effects of sample extract freeze-thawing on β-(1,3)-glucan. The aim of this study was to assess the effects of repeated freeze-thawing of household dust extracts on levels of β-(1,3)-glucan. Forty random household dust samples were extracted with 0.3 M NaOH and aliquots of extracts stored at -20°C were subjected to one, two, and three freeze-thaw cycles. They were analyzed for β-(1,3)-glucan by the Limulus amoebocyte assay (LAL) and results compared to freshly extracted samples (paired Pearson's t-test on logged values). Initial freezing of house dust extracts results in a significant decline in β-(1,3)-glucan. However, repeated freeze/thawing (up to three times) does not results in any further decline in β-(1,3)-glucan levels.
Journal of Occupational and Environmental Hygiene 01/2015; 12(1):D1-3. · 1.28 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: There is non-experimental evidence that paracetamol (acetaminophen) use may increase the risk of developing asthma. However numerous methodological issues need to be resolved before undertaking a randomized controlled trial to investigate this hypothesis.
[Show abstract][Hide abstract] ABSTRACT: AimTo determine whether vitamin D supplementation reduces primary care visits for acute respiratory infection (ARI).MethodsA randomised, double-blind, placebo-controlled trial was conducted inNew Zealandand powered to determine the vitamin D dose needed to achieve normal vitamin D status during infancy.Healthy pregnant women, from 27weeksgestation to birth, and their infants, from birth to age 6months, were assigned to placebo or one of two dosages of daily oral vitamin D3. Woman/infant pairs were randomised to: placebo/placebo, 1000IU/400IU, or 2000IU/800IU.For this ad hoc analysis, the primary care records of enrolled children were audited to age 18 months.ResultsTwo-hundred-and-sixty pregnant women were randomised to placebo (n=87), lower-dose (n=87) or higher-dose (n=86) vitamin D3. In comparison with the placebo group (99%), the proportion of children making any ARIvisitswas smaller in the higher-dose (87%, P=0.004), but not the lower-dose vitamin D3 group (95%, P=0.17). The median number of ARIvisits/child was less in the higher-dose vitamin D3group from age 6-18 months (placebo 4, lower-dose 3, higher-dose 2.5; P=0.048 for higher-dose vitamin D3 vs. placebo).Conclusion
Vitamin D3 supplementation during pregnancy and infancyreduces primary care visits for ARIduring early childhood.This article is protected by copyright. All rights reserved.
[Show abstract][Hide abstract] ABSTRACT: Background
In a double-blind, randomized, placebo-controlled birth cohort, we have recently shown a beneficial effect of Lactobacillus rhamnosus HN001 (HN001) for the prevention of eczema in children through to 6 years of age but no effect of Bifidobacterium animalis subsp lactis HN019 (HN019).Objective
Among this cohort of children, we aim to investigate whether these probiotics could modify the expression of genetic predisposition to eczema conferred by genetic variation in susceptibility genes.Methods
Thirty three eczema susceptibility SNPs (in eleven genes) were genotyped in 331 children of European ancestry.ResultsChildren who carried a genetic variant that put them at a high risk of developing eczema were less likely to develop eczema if they had been randomised to the HN001 intervention group compared to those in the placebo group. HN019 was also able to protect against the effects of some SNPs. As well as modifying genetic susceptibility to childhood eczema, HN001 was also found to modify genetic susceptibility to eczema severity and atopy risk.Conclusion and Clinical RelevanceThis is the first study to show an effect of a probiotic on reducing eczema risk amongst those with particular eczema-associated genotypes. Our findings suggest that Lactobacillus rhamnosus HN001 may be particularly effective in preventing eczema in children with specific high risk genotypes.This article is protected by copyright. All rights reserved.
[Show abstract][Hide abstract] ABSTRACT: INTRODUCTION: Moisture damage and visible mould in buildings are consistently linked with ill health, and microbes are suggested to be a key factor in the adverse exposure. Practical tools to reliably assess moisture related microbial contamination in buildings and to potentially predict health hazardous situations are lacking. The aim of this study was to evaluate a simple passive sampling approach in combination with quantitative PCR as a tool to objectively assess moisture damage and mould contamination in homes.
METHODS: Airborne settled dust passively collected over four weeks on electrostatic wipes placed in 93 residential homes in New Zealand were analysed for fungal and bacterial content using quantitative PCR (qPCR). The log transformed microbial measurement data were analysed against a home mould score using Pearson’s correlation test and home characteristics using Student’s T-Test, with a focus on researcher and parent reported observations of moisture damage, dampness and mould.
RESULTS: Levels of following fungal and bacterial groups were determined from airborne settled dust collected in children’s bedrooms: Cladosporium cladosporioides (median 4.00x102 cells/wipe), Aspergillus versicolor (86% of samples <LOD), Penicillium spp./ Aspergillus spp./Paecilomyces variotii group (Pen/Asp; median 3.98x104 cells/wipe), universal fungi (median 4.90x104 cells/wipe), Gram-positive (median 1.98x106 cells/wipe) and Gram-negative bacteria (median 8.66x105 cells/wipe). Levels of universal fungi and Pen/Asp groups were significantly elevated in homes in which mould odour, visible dampness and leaks or moisture damage were reported, and moreover correlated with a mould score calculated based on the extent of visible mould observed. Both Gram-positive and negative bacterial levels were significantly higher in homes where leaks or moisture damage and mould odour were observed, and where more than one child slept in the bedroom. Levels of C. cladosporioides were higher in homes with reported leaks or moisture damage.
CONCLUSIONS: Quantitative PCR analyses in combination with a standardized passive sampling approach for settled dust is a promising tool to objectively measure mould contamination in residential homes, both in epidemiological study settings and to support building inspections for moisture and mould damage in practical situations. Specifically, measurements of universal fungi and Penicillium/Aspergillus group were strongly associated with observations of visible mould, mould odour and moisture damage.
Indoor Air 2014, the 13th International Conference in Indoor Air Quality and Climate, Hong Kong; 07/2014
[Show abstract][Hide abstract] ABSTRACT: Improved smoking cessation rates are urgently required if New Zealand is to reach its target of a smokefree nation by 2025, during which some 600,000 smokers will need to quit. Nicotine replacement therapy remains a core part of the pharmacological approach to smoking cessation. Oral nicotine solutions with rapid onset have recently become available. We have examined the effect of a nicotine spray and a nicotine patch on smoking cessation for 12 months.
Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco. 05/2014;
[Show abstract][Hide abstract] ABSTRACT: Background
Exposures to hydrogen sulfide gas (H2S) have been inconclusively linked to a variety of negative cognitive outcomes. We investigated possible effects on cognitive function in an urban population with chronic, low-level exposure to H2S.
Participants were 1,637 adults, aged 18–65 years from Rotorua city, New Zealand, exposed to ambient H2S from geothermal sources. Exposures at homes and workplaces were estimated from data collected by summer and winter H2S monitoring networks across Rotorua in 2010/11. Metrics for H2S exposure at the time of participation and for exposure over the last 30 years were calculated. H2S exposure was modeled both as continuous variables and as quartiles of exposure covering the range of 0 – 64 ppb (0–88 μg/m3). Outcomes were neuropsychological tests measuring visual and verbal episodic memory, attention, fine motor skills, psychomotor speed and mood. Associations between cognition and measures of H2S exposure were investigated with multiple regression , while covarying demographics and factors known to be associated with cognitive performance.
The consistent finding was of no association between H2S exposure and cognition. Quartiles of H2S exposure had a small association with simple reaction time: higher exposures were associated with faster response times. Similarly, for digit symbol, higher H2S exposures tended to be marginally associated with better performance.
The results provide evidence that chronic H2S exposure, at the ambient levels found in and around Rotorua, is not associated with impairment of cognitive function.
Neurotoxicology and Teratology 03/2014; · 3.18 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: To investigate the effect of regular paracetamol on bronchial hyper-responsiveness (BHR) and asthma control in adult asthma.
Single research-based outpatient clinic.
94 adults with mild-to-moderate asthma received randomised treatment; 85 completed the study. Key inclusion criteria were age 18-65 years, forced expiratory volume in 1 s (FEV1) >70% predicted, provocation concentration of methacholine causing a 20% reduction in FEV1 (PC20) between 0.125 and 16 mg/mL. Key exclusion criteria included an asthma exacerbation within the previous 2 months, current regular use of paracetamol, use of high-dose aspirin or non-steroidal anti-inflammatory drugs, current or past cigarette smoking >10 pack-years.
In a 12-week randomised, double-blind, placebo-controlled, parallel-group study, participants received 12 weeks of 1 g paracetamol twice daily or placebo twice daily.
The primary outcome variable was BHR, measured as the PC20 at week 12. Secondary outcome variables included FEV1, fractional exhaled nitric oxide (FeNO) and asthma control questionnaire (ACQ) score.
At 12 weeks, the mean (SD) logarithm base two PC20 was 1.07 (2.36) in the control group (N=54) and 0.62 (2.09) in the paracetamol group (N=31). After controlling for baseline PC20, the mean difference (paracetamol minus placebo) was -0.48 doubling dose worsening in BHR in the paracetamol group (95% CI -1.28 to 0.32), p=0.24. There were no statistically significant differences (paracetamol minus placebo) in log FeNO (0.09 (95% CI -0.097 to 0.27)), FEV1 (-0.07 L (95% CI -0.15 to 0.01)) or ACQ score (-0.04 (95% CI -0.27 to 0.18)).
There was no significant effect of paracetamol on BHR and asthma control in adults with mild-to-moderate asthma. However, the study findings are limited by low power and the upper confidence limits did not rule out clinically relevant adverse effects.
Australia New Zealand Clinical Trials Registry Number: NZCTR12609000551291.
BMJ Open 01/2014; 4(2):e004324. · 2.06 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: OBJECTIVE:To determine the vitamin D dose necessary to achieve serum 25-hydroxyvitamin D (25(OH)D) concentration ≥20 ng/mL during infancy.METHODS:A randomized, double-blind, placebo-controlled trial in New Zealand. Pregnant mothers, from 27 weeks' gestation to birth, and then their infants, from birth to age 6 months, were randomly assigned to 1 of 3 mother/infant groups: placebo/placebo, vitamin D3 1000/400 IU, or vitamin D3 2000/800 IU. Serum 25(OH)D and calcium concentrations were measured at enrollment, 36 weeks' gestation, in cord blood, and in infants at 2, 4, and 6 months of age.RESULTS:Two-hundred-and-sixty pregnant women were randomized. At enrollment, the proportions with serum 25(OH)D ≥20 ng/mL for placebo, lower-dose, and higher-dose groups were 54%, 64%, and 55%, respectively. The proportion with 25(OH)D ≥20 ng/mL was larger in both intervention groups at 36 weeks' gestation (50%, 91%, 89%, P < .001). In comparison with placebo, the proportion of infants with 25(OH)D ≥20 ng/mL was larger in both intervention groups to age 4 months: cord blood (22%, 72%, 71%, P < .001), 2 months (50%, 82%, 92%, P < .001), and 4 months (66%, 87%, 87%, P = .004), but only in the higher-dose group at age 6 months (74%, 82%, 89%, P = .07; higher dose versus placebo P = .03, lower dose versus placebo P = .21).CONCLUSIONS:Daily vitamin D supplementation during pregnancy and then infancy with 1000/400 IU or 2000/800 IU increases the proportion of infants with 25(OH)D ≥20 ng/mL, with the higher dose sustaining this increase for longer.
[Show abstract][Hide abstract] ABSTRACT: Abstract Objective Children's soft toys are known to harbour house dust mite (HDM) allergens, but little is known whether they harbour cat or dog allergens. The objective of the study was to measure cat (Fel d 1), dog (Can f 1) and HDM allergens on children's soft toys. Methods Dust was collected from 40 children's soft toys and their mattresses. Data was collected on pet ownership. Dust samples were analysed for Fel d 1, Can f 1, Der p 1 and Der f 1 by ELISA and results expressed as median levels with inter-quartile ranges. Results Thirty five (87.5%) soft toys had detectable Fel d 1 levels (median: 0.73 µg/g; inter quartile range: 0.26-2.56 µg/g) while 34 (85%) had detectable Can f 1 levels (1.20 µg/g; 0.53-2.68). Correspondingly, 32 (80%) mattresses had detectable Fel d 1 levels (0.18 µg/g, 0.07-1.01) while 34 (85%) had detectable Can f 1 levels (0.50 µg/g; 0.33-1.06). All mattresses and soft toys had detectable HDM allergen (Der p 1 + Der f 1) levels with soft toys containing about 3 times higher levels than mattresses. In homes with cats (n=10) Fel d 1 levels were higher on soft toys than homes without cats (2.49 µg/g vs. 0.48 µg/g; p=0.0009). In homes with dogs (n=25) Can f 1 levels were generally higher on soft toys (1.38µg/g vs. 0.63 µg/g; p=0.10). Conclusions This study has shown that soft toys can harbour cat and dog allergen as well as HDM allergens, some with very high levels. Cat and dog ownership resulted in higher Fel d 1 and Can f 1 levels on soft toys and mattresses. The levels of Fel d 1, Can f 1 and HDM allergens on soft toys could be of importance to sensitized asthmatic children.
[Show abstract][Hide abstract] ABSTRACT: The role of probiotics in prevention of allergic disease is still not clear; efficacy may depend on the timing, dose, duration, and specific probiotic used. Using a double-blind randomized placebo-controlled trial (Australian New Zealand Clinical Trials Registry: ACTRN12607000518460), we have shown that in a high-risk birth cohort, maternal supplementation from 35 weeks gestation until 6 months if breastfeeding and infant supplementation from birth until 2 years with Lactobacillus rhamnosus HN001 (HN001) (6 × 10(9) cfu/day) halved the cumulative prevalence of eczema at 2 and 4 years. Bifidobacterium animalis subsp lactis HN019 (HN019) (9 × 10(9) cfu/day) had no significant effect.
To determine whether differences in effects of HN001 and HN019 on eczema persist to age 6 years, and to investigate effects on sensitization.
Standard procedures were used to assess eczema (The UK Working Party's Criteria), eczema severity (SCORAD), atopic sensitization [skin prick tests (SPT), total and specific IgE] and standard questions used for asthma, wheeze, and rhinoconjunctivitis.
HN001 was associated with significantly lower cumulative prevalence of eczema (HR = 0.56, 95% CI 0.39-0.80), SCORAD ≥ 10 (HR = 0.69, 0.49-0.98) and SPT sensitization (HR = 0.69, 95% CI 0.48-0.99). The point prevalence of eczema (RR = 0.66, 95% CI 0.44-1.00), SCORAD ≥ 10 (RR = 0.62, 95% CI 0.38-1.01) and SPT sensitization (RR = 0.72, 95% CI 0.53-1.00) were also reduced among children taking HN001. HN019 had no significant effect on any outcome.
This study provides evidence for the efficacy of the probiotic L. rhamnosus HN001 in preventing the development of eczema and possibly also atopic sensitization in high risk infants to age 6 years. The absence of a similar effect for HN019 indicates that benefits may be species specific.
[Show abstract][Hide abstract] ABSTRACT: While many epidemiological studies have shown that low outdoor temperatures are associated with increased rates of hospitalisation and mortality (especially for respiratory or cardiovascular disease), very few studies have looked at the association between indoor temperatures and health. Such studies are clearly warranted, as people have greater exposure to the indoor environment than the outdoor environment.
To examine the relationship between various metrics of indoor temperature and lung function in children with asthma. Our specific research questions were: (1) In which room of the home is temperature most strongly associated with lung function? (2) Which exposure metric best describes the relationship between indoor temperature and lung function? (3) Over what lag/time period does indoor air temperature affect lung function most strongly?
The Heating Housing and Health Study was a randomised controlled trial that investigated the effect of installing heaters in the homes of children with asthma. This study collected measurements of lung function (daily) and indoor temperature (hourly). Lung function and indoor temperature were measured for 309 children over 12 049 child-days. Statistical models were fitted to identify the best measures and metrics.
The strongest association with lung function was found for the severity of exposure to low bedroom temperatures averaged over the preceding periods of 0-7 to 0-12 days. A 1°C increase in temperature was associated with an average increase of 0.010, 0.008, 10.06, 12.06, in our four measures of lung function (peak expiratory flow rate (PEFR) morning, PEFR evening, forced expiratory volume in 1 s (FEV1) morning and FEV1 evening).
Indoor temperatures have a small, but significant, association with short-term variations in the lung function of children with asthma.
Journal of epidemiology and community health 08/2013; · 3.04 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Eczema is a common chronic disease which has significant morbidity and costs for children and their families. Phase One (1993) of the International Study of Asthma and Allergies in Childhood (ISAAC) found a high prevalence of symptoms of eczema in New Zealand.
In Phase Three (2001-3) we aimed to answer these three questions: Is the prevalence of eczema changing over time?; Are there ethnic differences in prevalence?; and What are the risk factors for eczema?
Five New Zealand centres participated in ISAAC Phases One and Three using the same methodology. Questionnaires about ethnicity, symptoms of eczema and environmental factors were completed by parents of 6-7 year olds (children) and self-completed by 13-14 year olds (adolescents). Prevalence and change per year were calculated by centre, ethnicity and gender. Prevalence differences between centres and associations with environmental factors were examined using logistic regression.
There was little change in prevalence over time for the children, and a decrease in prevalence for the adolescents. Prevalence was higher among Māori and even higher among Pacific participants than among European children. Positive associations with current eczema symptoms were found for both age groups for truck traffic in the street of residence, and current paracetamol consumption, and for children only, antibiotics or paracetamol in the 1st year of life. Inverse associations were found with residence in New Zealand less than 5 years, consumption of milk, seafood, and eggs, and presence of a dog in the home.
Eczema remains a significant problem, particularly for young Māori and Pacific New Zealanders in whom less recognition of eczema and poorer access to effective, sustained eczema management may be contributing factors. Reverse causation may explain all the environmental findings apart from truck traffic which is increasing in New Zealand.
[Show abstract][Hide abstract] ABSTRACT: Many studies report that damp housing conditions are associated with respiratory symptoms. Less is known about mechanisms and possible effect modifiers. Studies of dampness in relation to allergic sensitization and eczema are scarce.
We study the influence of damp housing conditions world-wide on symptoms and objective outcomes.
Cross-sectional studies of 8-12-year-old children in 20 countries used standardized methodology from Phase Two of the International Study of Asthma and Allergies in Childhood (ISAAC). Symptoms of asthma, rhinitis and eczema, plus residential exposure to dampness and moulds, were ascertained by parental questionnaires (n = 46 051). Skin examination, skin prick tests (n = 26 967) and hypertonic saline bronchial challenge (n = 5713) were performed. In subsamples stratified by wheeze (n = 1175), dust was sampled and analysed for house dust mite (HDM) allergens and endotoxin.
Current exposure to dampness was more common for wheezy children (pooled odds ratio 1.58, 95% CI 1.40-1.79) and was associated with greater symptom severity among wheezers, irrespective of atopy. A significant (P < 0.01) adverse effect of dampness was also seen for cough and phlegm, rhinitis and reported eczema, but not for examined eczema, nor bronchial hyperresponsiveness. HDM sensitization was more common in damp homes (OR 1.16, 1.03-1.32). HDM-allergen levels were higher in damp homes and were positively associated with HDM-sensitization, but not wheeze.
A consistent association of dampness with respiratory and other symptoms was found in both affluent and non-affluent countries, among both atopic and non-atopic children. HDM exposure and sensitization may contribute, but the link seems to be related principally to non-atopic mechanisms.
[Show abstract][Hide abstract] ABSTRACT: Indoor air pollution from a range of household cooking fuels has been implicated in the development and exacerbation of respiratory diseases. In both rich and poor countries, the effects of cooking fuels on asthma and allergies in childhood are unclear. We investigated the association between asthma and the use of a range of cooking fuels around the world.
For phase three of the International Study of Asthma and Allergies in Childhood (ISAAC), written questionnaires were self-completed at school by secondary school students aged 13-14 years, 244 734 (78%) of whom were then shown a video questionnaire on wheezing symptoms. Parents of children aged 6-7 years completed the written questionnaire at home. We investigated the association between types of cooking fuels and symptoms of asthma using logistic regression. Adjustments were made for sex, region of the world, language, gross national income, maternal education, parental smoking, and six other subject-specific covariates. The ISAAC study is now closed, but researchers can continue to use the instruments for further research.
Data were collected between 1999 and 2004. 512 707 primary and secondary school children from 108 centres in 47 countries were included in the analysis. The use of an open fire for cooking was associated with an increased risk of symptoms of asthma and reported asthma in both children aged 6-7 years (odds ratio [OR] for wheeze in the past year, 1·78, 95% CI 1·51-2·10) and those aged 13-14 years (OR 1·20, 95% CI 1·06-1·37). In the final multivariate analyses, ORs for wheeze in the past year and the use of solely an open fire for cooking were 2·17 (95% CI 1·64-2·87) for children aged 6-7 years and 1·35 (1·11-1·64) for children aged 13-14 years. Odds ratios for wheeze in the past year and the use of open fire in combination with other fuels for cooking were 1·51 (1·25-1·81 for children aged 6-7 years and 1·35 (1·15-1·58) for those aged 13-14 years. In both age groups, we detected no evidence of an association between the use of gas as a cooking fuel and either asthma symptoms or asthma diagnosis.
The use of open fires for cooking is associated with an increased risk of symptoms of asthma and of asthma diagnosis in children. Because a large percentage of the world population uses open fires for cooking, this method of cooking might be an important modifiable risk factor if the association is proven to be causal.
BUPA Foundation, the Auckland Medical Research Foundation, the Health Research Council of New Zealand, the Asthma and Respiratory Foundation of New Zealand, the Child Health Research Foundation, the Hawke's Bay Medical Research Foundation, the Waikato Medical Research Foundation, Glaxo Wellcome New Zealand, the NZ Lottery Board, Astra Zeneca New Zealand, Hong Kong Research Grant Council, Glaxo Wellcome International Medical Affairs.
The lancet. Respiratory medicine. 07/2013; 1(5):386-94.