The aim of this systematic review is to provide information regarding the incidence and levels of aflatoxin M (AFM) in raw and heat processed cow's milk in Serbia during 2015-16 and to compare these with collected data on the occurrence of AFM in raw milk and dairy products during the last decade in our region. Estimation of dietary exposure (EDI) and hazard index (HI) calculations for different age groups of the population were also carried out, based on the AFM content of milk samples and on available food consumption data in Serbia. AFM was detected in 69.9% (984/1408) of raw milk samples in 2015 versus 84.9% (3094/3646) in 2016, while in heat-processed milk, AFM was detected in 77.8% (364/468) in 2015 versus 98.5% (753/765) in 2016. On the basis of the obtained results, 450 (9%) of raw and 14 (1.1%) of heat-processed milk samples were contaminated with AFM levels above the maximum permitted level in Serbia (0.25 μg kg). However, a large percentage of raw and heat processed milk in Serbia (30.1% and 17.3%, respectively) was contaminated with AFM levels above the maximum permitted level regulated in the European Union (0.05 μg kg). Therefore, in order to protect consumer health, it is extremely important to further control the level of aflatoxins in milk, and this should be considered as a high priority for risk management actions.
Transmission pathways of foodborne viruses include contamination of food by infected food handlers, by contamination of food during the production process and by consumption of products of animal origin harbouring a zoonotic virus. Viral foodborne illnesses, which have become a significant cause of all reported foodborne illnesses in recent years and considered as an emerging risk in veterinary public health. Microbiological genomics studies discovered that Noroviruses and hepatitis A viruses were primarily associated with food-handler transmission and sewage-contaminated foods. In contrast, hepatitis E was associated with consumption of raw or undercooked meat of pig or wild animals. In order to facilitate source attribution and identify risk prevention measures, Routine harmonized surveillance of viral outbreaks, and surveillance of virus occurrence in food commodities, in combination with systematic strain typing, and joint expertise from veterinary, food, and clinical microbiologists would be recommended.
The aim of this study was to assess the expression of a toxic shock syndrome toxin-1 (TSST-1) gene of Staphylococcus aureus in different types of milk, depending on inadequate temperature and storage conditions. Pasteurized and UHT milk were inoculated with monotoxic TSST-1 strain of S. aureus and growth kinetics was determined by the drop plate method using Baird-Parker agar medium in accordance with EN ISO 6888-1. The patterns of gene regulation were detected by quantitative reverse transcriptase PCR. Relative quantification method for statistical significance testing was used to detect significant gene expression responses. The results of experiments showed the dependence of the growth rate and consequent up-regulation of TSST-1 encoding gene on storage time-temperature and type of milk. In contaminated pasteurized and UHT milk kept at both 15 °C and 22 °C S. aureus significantly increased its virulent potential over time. This effect was a bit more emphasized in UHT milk serving as a "proof of concept". Possible explanation could be a presence of lactic acid bacteria in pasteurized milk which is known to have down-regulatory effect on TSST-1 gene. Maintenance of the milk storage temperature below 8 °C and employment of microbiological control measures in hygienic practices, from milk producer through retailer and on to the consumer is of utmost importance to decrease risk of non-emetic staphylococcal poisoning.
Nitrites are inorganic salts widespread in water, fruits, vegetables, meat and meat products. Application of nitrites in the meat industry is necessary for multiple reasons. They suppress development of some microorganisms in food and are a source of nitrogen oxide that is widely involved in physiological functions of metabolism, food intake and energy balance. On the other hand, nitrites in food can produce nitrosamines that increase the risk of cancer. During regular quality control in 2016-2018, 972 samples of meat products were analysed and verifi ed for compliance with regulations concerning nitrite levels, and the average participation of these meat products in daily intake of nitrite was estimated. The amount of nitrites in the examined meat products was within the permitted limits. The daily intake of nitrite in Serbia from meat and meat products was estimated as being from 0.015-0.020 mg kg −1 body weight, which is below the limit values set by EFSA for safe daily intake, i.e. 0.06-0.07 mg kg −1 body weight.
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