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Current poultry food safety guidelines for Salmonella, the leading cause of foodborne illness outbreaks, are inadequate, according to a representative of the US Department of Agriculture (USDA). A new study conducted by Thomas Oscar, USDA Agricultural Research Service, “Salmonella prevalence alone is not a good indicator of poultry food safety,” explored additional factors that must be considered in order to identify poultry products that are truly safe for human consumption.
The poultry industry currently uses Salmonella prevalence or positivity rate as an indicator of food safety, but there are numerous other factors that influence the level of risk to public health, Oscar pointed out. The study showed that even though other meats like ground chicken could have a lower Salmonella prevalence than ground turkey at meal preparation, they could pose a higher risk of salmonellosis if they are contaminated with higher numbers of more virulent serotypes of Salmonella.
The current approach to food safety in the poultry industry consists of two pillars:
Oscar said that these approaches are limited because pathogen prevalence is not the only risk factor for an outbreak, and that harm to public health occurs before corrective action is taken in the second pillar.
He also noted that present food safety reviews do not include data such as Salmonella serotype and virulence and number, incidence and extent of temperature abuse, incidence and extent of undercooking, incidence and extent of cross-contamination during meal preparation, food consumption behaviour, and host resistance which he described as important risk factors for salmonellosis from ground turkey and other poultry products.
According to the study, processing plants with a high prevalence of Salmonella on its poultry meat do not necessarily pose a higher risk of salmonellosis. Rather, poultry meat from a processing plant with a lower prevalence of Salmonella could pose a higher risk if:
The study concluded that to increase food safety, a process risk model or computer model should be applied at the processing plant exit to integrate pathogen contamination data and post-processing risk factors to provide an objective description regarding the safety of individual lots of food before they are shipped to consumers.
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