Foodborne Diseases (Food Science and Technology (Academic Press))

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Model details are given in the online supplementary technical appendix. We obtained data from the IID2 study on population incidence and GP consultation rates for IID, and their associated uncertainty, for the above pathogens. For Listeria , no incidence data were available from IID1 or IID2 so we used the number of laboratory reports for listeriosis in as a conservative population incidence estimate.

We used data on outbreaks reported to national surveillance systems between January and December to estimate the proportion of cases transmitted through food. For Cryptosporidium and Giardia , this approach gave an unrealistically high estimate for the proportion of cases transmitted through food because, of the few outbreaks that were reported, those involving foodborne transmission were larger. We divided the retrieved articles into two categories: In Group A studies the proportion of cases transmitted through food was estimated for several pathogens, through expert elicitation or retrospective data reviews.

Group B were primarily pathogen-specific case—control studies or studies using microbiological typing for source attribution. Where the observed proportion from outbreak data fell outside the limits of this uniform distribution, we arbitrarily allowed the lower or upper limit of the distribution to extend by 0.

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Data on hospitalisations were available only for outbreaks reported in England and Wales. For each reported outbreak, excluding those in hospitals or residential institutions, we computed the proportion of cases hospitalised by causative organism. We based hospitalisation estimates on all outbreaks with the available data, as we found no major differences in hospitalisation between foodborne and other outbreaks. For adenovirus and sapovirus, we used parameters derived from analysis of rotavirus and norovirus outbreaks, respectively.

We obtained estimates of the number of foodborne cases, GP consultations and hospitalisations using three different approaches. In Model 1, we used the Monte Carlo simulation to draw values at random from each parameter distribution. These priors were used, together with the outbreak data, to obtain posterior distributions for these parameters, which were then used in the model. This model could not be applied to sapovirus, because none of the identified studies had information about this pathogen.

This model was applied to Campylobacter , E. A full description of model parameters is given in the online supplementary technical appendix. We checked model convergence graphically by plotting parameter values over time to verify adequate mixing, plotting autocorrelograms and comparing density plots for outcome variables by tertile of the simulation chain. We conducted the analyses using Stata V. We used the winbugsfromstata module in Stata to carry out the simulations.

An Ethics Committee favourable opinion was not required. These were secondary analyses of previously collected, publicly available data. All data sets used were completely anonymous and there was no risk of disclosure of personal data.

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The European Commission has established the Food and Veterinary Office to monitor food hygiene, veterinary health, and plant health legislation within the European Union, and has embraced risk-assessment procedures to establish control priorities. Study design, methods and risk factors investigated varied widely. The ordinance is incorporated by reference into federal specifications for procurement of milk and milk products, and it is used as the sanitary regulation for milk and milk products served on interstate carriers. BMJ Open ; 6: University research is largely supported by private industry, under grants or contracts with private companies or commodity to conduct intramural research on food safety.

The identified studies used to inform Bayesian uniform priors are summarised in the online supplementary technical appendix tables A2 and A3. Empirical bootstrap distributions for the estimated proportion of cases due to foodborne transmission based on outbreak data. Hospitalisation was particularly high for E. Similarly, other pathogens such as C.

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Estimates of food-related cases, GP consultations and hospital admissions based on the Bayesian approach used in Model 2 are presented in table 4. Other common causes of foodborne disease included C. For Model 2, there were insufficient data from the studies we identified to enable estimation of foodborne sapovirus. For Campylobacter , E. The estimates from the three different models are compared in figure 3A—C.

Monte Carlo simulation approach; Model 2: Bayesian approach using data from published food attribution studies; Model 3: In general, the results from all three approaches were similar for food-related cases and GP consultations. For most organisms, the Bayesian estimates from Model 2 benefited from greater precision. There were differences in the number of food-related hospital admissions estimated by the Monte Carlo and Bayesian approaches for some organisms, notably Campylobacter , rotavirus, adenovirus and astrovirus. The differences reflect discordance between outbreak data and data from the IID studies in terms of the hospitalisation rate for these organisms.

Where differences were observed, the Bayesian approach gave more conservative estimates of the number of food-related hospital admissions. For the four pathogens with sufficient data from the literature review to generate estimates from Model 3 Campylobacter , E. It was impossible to calculate listeriosis hospitalisations because all reported Listeria outbreaks occurred in hospitals. To the best of our knowledge this is the first study to incorporate empirical data and prior information from a systematic review using Bayesian methodology for estimating the proportion of IID that is transmitted through contaminated food.

Despite this, the number of Campylobacter -related hospital admissions is comparatively small, reflecting a generally lower level of acute disease severity compared with other pathogens. In contrast, Salmonella and E. Other common causes of foodborne illness include C. Other viral agents rank lower as causes of foodborne illness. Our analysis updates previous estimates for England and Wales in and expands on them by accounting for uncertainty.

Other studies investigating the burden of foodborne illness caused by a wide range of pathogens have been carried out in Australia, the USA and the Netherlands. In the US study, it was also the second most common cause of food-related hospital admissions. A likely reason for this discrepancy is the definitions of outbreaks that are incorporated in the various modelling studies. Some data sets contain only outbreaks transmitted through food while others, like ours until , contained all outbreaks of IID no matter what the route of transmission. This means that the proportion of norovirus cases transmitted through food is likely to be overestimated in data sets that contain only outbreaks transmitted through food.

A major strength of our analysis is the availability of directly observed, pathogen-specific incidence data from the recent IID2 study in the UK, 10 which precludes the need to adjust for underascertainment and requires fewer assumptions about healthcare usage.

The use of methods to account fully for parameter uncertainties is an additional strength, and is useful for highlighting areas where data are sparse. This is particularly true for hospitalisation estimates, for which there is a dearth of reliable data. We investigated other sources of hospitalisation data, such as electronic records of inpatient admissions.

However, these data lack specific diagnostic codes for certain key pathogens, including E. We therefore used outbreak data to estimate hospitalisation. A potential limitation is that severe cases requiring hospitalisation might be more reliably recorded in outbreak reports, whereas milder cases might be missed. There might genuinely be higher hospitalisation rates in outbreaks than sporadic cases because of higher dose exposures or different populations might be affected in outbreaks.

Alternatively, outbreaks with more hospitalised cases might be more likely to be investigated and reported.

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