The regionality of campylobacteriosis seasonality in New Zealand

Hearnden, Mark; Skelly, Chris; Eyles, Rebekah; Weinstein, Philip

doi:10.1080/09603120310001616128

Cited by 34 publications

(48 citation statements)

References 16 publications

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“…Aggregation of national data will obscure important local or sub-national effects. The relative important of transmission routes may vary within countries, as has been shown in New Zealand (Hearnden et al 2003). Further studies are needed when data become available that can identify the effect of climate on the different campylobacter species and animal reservoirs.…”

Section: Discussionmentioning

confidence: 94%

Climate variability and campylobacter infection: an international study

et al. 2004

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Campylobacter is among the most important agents of enteritis in developed countries. We have described the potential environmental determinants of the seasonal pattern of infection with campylobacter in Europe, Canada, Australia and New Zealand. Specifically, we investigated the role of climate variability on laboratory-confirmed cases of campylobacter infection from 15 populations. Regression analysis was used to quantify the associations between timing of seasonal peaks in infection in space and time. The short-term association between weekly weather and cases was also investigated using Poisson regression adapted for time series data. All countries in our study showed a distinct seasonality in campylobacter transmission, with many, but not all, populations showing a peak in spring. Countries with milder winters have peaks of infection earlier in the year. The timing of the peak of infection is weakly associated with high temperatures 3 months previously. Weekly variation in campylobacter infection in one region of the UK appeared to be little affected by short-term changes in weather patterns. The geographical variation in the timing of the seasonal peak suggests that climate may be a contributing factor to campylobacter transmission. The main driver of seasonality of campylobacter remains elusive and underscores the need to identify the major serotypes and routes of transmission for this disease.

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Section: Discussionmentioning

confidence: 94%

Climate variability and campylobacter infection: an international study

et al. 2004

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“…Campylobacter sp. outbreaks occur more often in rural areas, where households often tend to be supplied by private water sources, which tend to be more susceptible to contamination during extreme weather events (Hearnden et al, 2003; Pebody et al, 1997). In Sweden, a positive association was found between Campylobacter incidence and average pipeline length per person for populations not connected to public water supplies (Nygard et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Climate Change Impact Assessment of Food- and Waterborne Diseases

Semenza

Herbst

Rechenburg

et al. 2012

Critical Reviews in Environmental Science and Technology

149

111

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The PubMed and ScienceDirect bibliographic databases were searched for the period of 1998–2009 to evaluate the impact of climatic and environmental determinants on food- and waterborne diseases. The authors assessed 1,642 short and concise sentences (key facts), which were extracted from 722 relevant articles and stored in a climate change knowledge base. Key facts pertaining to temperature, precipitation, water, and food for 6 selected pathogens were scrutinized, evaluated, and compiled according to exposure pathways. These key facts (corresponding to approximately 50,000 words) were mapped to 275 terminology terms identified in the literature, which generated 6,341 connections. These relationships were plotted on semantic network maps to examine the interconnections between variables. The risk of campylobacteriosis is associated with mean weekly temperatures, although this link is shown more strongly in the literature relating to salmonellosis. Irregular and severe rain events are associated with Cryptosporidium sp. outbreaks, while noncholera Vibrio sp. displays increased growth rates in coastal waters during hot summers. In contrast, for Norovirus and Listeria sp. the association with climatic variables was relatively weak, but much stronger for food determinants. Electronic data mining to assess the impact of climate change on food- and waterborne diseases assured a methodical appraisal of the field. This climate change knowledge base can support national climate change vulnerability, impact, and adaptation assessments and facilitate the management of future threats from infectious diseases. In the light of diminishing resources for public health this approach can help balance different climate change adaptation options.

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“…As many human infectious pathogens appear in a regular seasonal pattern [20,21], seasonal exposure to infectious agents may induce bursts of immune diseases, such as IBD [22,23], and there may be an association between the month of birth and risk of developing IBD later in life [24]. In the Asian area, bacterial infections show a seasonal pattern of occurrence that peaks in the spring and summer [25,26], but viral infections generally occur in the autumn and spring [27], which is slightly different from the seasonality found in Western populations according to a number of epidemiological studies [28,29]. The infection pattern in the Asian area is consistent with the data of our study, and this consistency may provide a clue for determining the link between bacterial infection and flares of UC, and viral exposure in early life, such as during pregnancy or postpartum, with an increased chance of developing UC later in life.…”

Section: Discussionmentioning

confidence: 99%

Seasonality in Flares and Months of Births of Patients with Ulcerative Colitis in a Chinese Population

Bai

Guo

Shen³

et al. 2008

Dig Dis Sci

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Background and Aims Reports on seasonality in flares or months of births of inflammatory bowel disease patients have been inconsistent, but little data are available in a Chinese population. The aim of this study was to determine whether symptom flares and births of ulcerative colitis (UC) patients follow a seasonal pattern. Methods Patients with a diagnosis of UC established between January 1990 and December 2007 were investigated according to the occurrence of flares of symptoms and months of births. The expected flares or births were calculated on a monthly basis over the study period, taking into consideration the difference in the number of days in the month in each year. Results A total of 409 UC patients were included in the study, and 1030 flares of symptoms were determined. The peak number of flares occurred during the spring and summer, especially in June, while the nadir occurred in the winter, especially in January (v 2 (11 df) = 32.74304, P \ 0.005). The symptom flares also occurred more frequently in the spring-summer period than in the autumnwinter period (v 2 (3 df) = 22.1269, P \ 0.001). There was no statistical difference in birth distribution on a monthly or seasonal (spring, summer, autumn, winter) basis. However, the births of UC patients occurred more frequently in the autumn-winter period than in the spring-summer period when the data were merged into these two seasonal components (v 2 (1 df) = 5.255607, P \ 0.025). Conclusions The data indicate that the symptom flares of UC occurred more frequently in the spring and summer, while the births of UC patients occurred more often in the autumn and winter. Environmental recurring factors may be associated with the symptom flares of UC, and these factors during pregnancy or postpartum may be associated with susceptibility to UC later in life.

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The regionality of campylobacteriosis seasonality in New Zealand

Cited by 34 publications

References 16 publications

Climate variability and campylobacter infection: an international study

Climate variability and campylobacter infection: an international study

Climate Change Impact Assessment of Food- and Waterborne Diseases

Seasonality in Flares and Months of Births of Patients with Ulcerative Colitis in a Chinese Population

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