Meat-borne Parasites Research Articles

Sympatric occurrence of Taenia saginata and Sarcocystis spp. in cattle from Narok County, Kenya: meat inspection findings with molecular validation.

The epidemiological picture of Taenia saginata infections in Kenya is fragmented with limited available data. Although Sarcocystis species are significant meat-borne parasites, few studies have explored their occurrence in Kenya. This study aimed to estimate the occurrence of bovine cysticercosis and screen for the presence of Sarcocystis spp. A meat inspection-based survey was conducted in ten abattoirs in Narok County, Kenya, and inspection for T. saginata cysticerci was limited to the Triceps brachii muscle. The apparent occurrence of the parasite was 5.4% (95% CI, 3.8, 7.6, n=573). Molecular confirmation of T. saginata was done via nested polymerase chain reaction targeting the mitochondrial 12S ribosomal RNA gene and restricted fragment length polymorphism. Sarcocystis species were identified using a multiplex polymerase chain reaction method targeting the 18S ribosomal RNA gene sequences and the mitochondrial cytochrome c oxidase subunit I gene. Of the 31 cystic lesions tested, 26/31 (83.9%) were confirmed to be T. saginata.Sarcocystis cruzi and S. hominis were detected in 8/31 (25.8%) and 1/31 (3.2%) of the cystic lesions, respectively. Co-infections of S. cruzi and T. saginata were found in 6/31 lesions (19.4%). The confirmation of bovine cysticercosis and S. hominis is suggestive of the presence of risky culinary and sanitation practices that facilitate transmission. This is the first report and molecular confirmation of Sarcocystis spp. in cattle in the country. The presence of both zoonotic S. hominis and pathogenic S. cruzi highlights an underexplored concern of veterinary and human health significance, warranting further epidemiological investigation.

Foodborne Parasites and Their Complex Life Cycles Challenging Food Safety in Different Food Chains

Zoonotic foodborne parasites often represent complex, multi host life cycles with parasite stages in the hosts, but also in the environment. This manuscript aims to provide an overview of important zoonotic foodborne parasites, with a focus on the different food chains in which parasite stages may occur. We have chosen some examples of meat-borne parasites occurring in livestock (Taenia spp., Trichinella spp. and Toxoplasma gondii), as well as Fasciola spp., an example of a zoonotic parasite of livestock, but transmitted to humans via contaminated vegetables or water, covering the 'farm to fork' food chain; and meat-borne parasites occurring in wildlife (Trichinella spp., Toxoplasma gondii), covering the 'forest to fork' food chain. Moreover, fish-borne parasites (Clonorchis spp., Opisthorchis spp. and Anisakidae) covering the 'pond/ocean/freshwater to fork' food chain are reviewed. The increased popularity of consumption of raw and ready-to-eat meat, fish and vegetables may pose a risk for consumers, since most post-harvest processing measures do not always guarantee the complete removal of parasite stages or their effective inactivation. We also highlight the impact of increasing contact between wildlife, livestock and humans on food safety. Risk based approaches, and diagnostics and control/prevention tackled from an integrated, multipathogen and multidisciplinary point of view should be considered as well.

Prevalence of Meat Borne Parasites in Slaughtered Animals in Markaz Ashmoon Abattoirs with Special References to Their Economic Losses

Prevalence of Meat Borne Parasites in Slaughtered Animals in Markaz Ashmoon Abattoirs with Special References to Their Economic Losses

Prevalence of Some Zoonotic Parasitic Affections in Sheep Carcasses in a Local Abattoir: In Cairo, Egypt

Meat-borne zoonotic parasites raised from consumption of undercooked and/or crossly contaminated meats can infect human by direct and/or indirect ways causing many mild to serious diseases; so in the present study, some meat-borne transmissible parasites were investigated in 5239 freshly dressed sheep carcasses in local Egyptian abattoir located at Cairo governorate along the period of 2017-2018. Results of Post- Mortem inspection revealed the detection of Fasciola, Cysticercus and Hydatid cyst in 3.47, 1.06 and 1.83% of the total examined carcasses with total economic losses of 9306.78 L.E, 2892 L.E and 4380 LE, respectively. It is worthily noted that fascioliasis recorded the highest incidence of infection, followed by hydatidosis and cysticercosis in the examined carcasses, respectively. Cysticercus ovis and C. tenuicollis were detected in 32.14% and 67.85% with total economic losses of 714 L.E and 2178 L.E because of infected heart and liver condemnation during 2017 and 2018, respectively. Furthermore, hydatid cyst was detected in 0.47% and 1.35% of the examined lung and liver samples with total economic losses of 1188 L.E and 3192 L.E because of infected lung and liver condemnation during 2017 and 2018, respectively. Referring to the obtained results, it was obvious that parasitic infection of sheep meat and offal constrains a lot of economic losses, threatens the meat production industry and throws lights over the health importance of veterinary inspection great role in protecting human-being from be infested with zoonotic meat-borne parasites. So, magnification and great support should be given to training veterinary inspectors in slaughter houses in Egypt.

Prevalence of Some Foodborne Parasitic Affection in Slaughtered Animals in Loacal Egyptian Abottoir

Fascioliasis, cysticercosis and hydatidosis were aimed to be investigated in some slaughtered animals (cattle, buffalo and camel) in local Egyptian abattoir located in Cairo governorate. 10317, 763 and 290 cattle, buffalo and camel carcasses, respectively were examined in the period of 2017-2018. Results of PM inspection along the investigation period revealed detection of Fasciola in 0.58 and 1.4% of the examined cattle and buffalo carcasses, respectively, while was not detected in camel carcasses. Also, cysticercosis was detected in 0.47 and 0.69% of the examined cattle and camel carcasses, respectively; while was not detected in buffalo carcasses. In addition, hydatidosis was detected in lung and liver of 0.038 and 0.096% of cattle carcasses; 3.4 and 1.03% of camel carcasses, respectively, while was not detected in the examined buffalo samples. Annual values of financial losses because of the condemned affected parts summed total of 11712.5, 32940.0 and 2410 LE due to fascioliasis, cysticercosis and hydatidosis, respectively along the investigation period (2017 and 2018). Referring to the obtained results, records of 2017 appeared to be more infection prevalent than 2018 with more financial losses, moreover, fascioliasis was the most prominent affection in the present study. In addition, the critical veterinary inspection has a great role in protecting human-being to be infected with zoonotic meat-borne parasites. So, magnification and great support should be given to training veterinary inspectors in slaughter houses in Egypt.

Smart carnivores think twice: Red fox delays scavenging on conspecific carcasses to reduce parasite risk

The recent SARS-CoV-2 epidemic has highlighted the need to prevent emerging and re-emerging diseases, which means that we must approach the study of diseases from a One Health perspective. The study of pathogen transmission in wildlife is challenging, but it is unquestionably key to understand how epidemiological interactions occur at the wildlife-domestic-human interface. In this context, studying parasite avoidance behaviours may provide essential insights on parasite transmission, host-parasite coevolution, and energy flow through food-webs. However, the strategies of avoiding trophically transmitted parasites in mammalian carnivores have received little scientific attention. Here, we explore the behaviour of red foxes (Vulpes vulpes) and other mammalian carnivores at conspecific and heterospecific carnivore carcasses using videos recorded by camera traps. We aim to determine 1) the factors influencing the probability of foxes to practice cannibalism, and 2) whether the scavenging behaviour of foxes differ when facing conspecific vs. heterospecific carcasses. We found that red foxes were generally reluctant to consume mesocarnivore carrion, especially of conspecifics. When recorded, consumption by foxes was delayed several days (heterospecific carcasses) or weeks (conspecific carcasses) after carcass detection. Other mammalian scavengers showed a similar pattern. Also, meat-borne parasite transmission from wild carnivore carcasses to domestic dogs and cats was highly unlikely. Our findings challenge the widespread assumption that cannibalistic or intra-specific scavenging is a major transmission route for Trichinella spp. and other meat-borne parasites, especially for the red fox. Overall, our results suggest that the feeding decisions of scavengers are probably shaped by two main contrasting forces, namely the nutritional reward provided by carrion of phylogenetically similar species and the risk of acquiring meat-borne parasites shared with these species. This study illustrates how the detailed monitoring of carnivore behaviour is essential to assess the epidemiological role of these hosts in the maintenance and dispersion of parasites of public and animal health relevance.

Reprint of: Survival of Trichinella spiralis in cured meat products

Processing of meat is one possible approach to control meat-borne parasites. Processing methods such as freezing, cooking and irradiation are recommended for the control of Trichinella in pork, horse or game meat if specific technical conditions are fulfilled. Curing is a widely used preservation process influencing product characteristics such as shelf life, food safety, and taste. As curing methods are characterized by high parameter variability and predictions about inactivation of parasitic stages in raw meat products are difficult, curing and smoking are not recommended for Trichinella control.The objective of this study was to investigate the survival of T. spiralis in cured raw sausages taking into account water activity (aw-value), pH value, temperature, and time. For this purpose, four different types of sausage (Knackwurst, vacuum packed Knackwurst, short ripened salami, long ripened salami) were produced using T. spiralis infested batter. After production, the sausages were stored at product specific conditions for up to 35 days. During storage, pH value and aw-value of the sausages were monitored over time. Further, sausages of each type were digested using the magnetic stirrer method and the viability of the isolated larvae was assessed using a previously published larval motility test as a proxy for viability and infectivity of Trichinella larvae. In this context, we also introduce a three-level rated infectivity score (RIS) with a clear categorization scheme allowing the assessment of the infectivity of larvae.Based on the RIS, larvae isolated from the salamis were regarded as potentially infective until day 2 (short ripened salami) or day 3 (long ripened salami) post ripening, whereas in Knackwurst, potentially infective larvae were still found by day 8 post ripening. In contrast potentially infective larvae were detected in vacuum-packed Knackwurst until day 24 post ripening. Finally, using the RIS approach, data from previously published studies were collected and subjected to a correlation analysis to identify matrix factors linked to short Trichinella inactivation times.

Understanding potential implications for non-trophic parasite transmission based on vertebrate behavior at mesocarnivore carcass sites

High infection risk is often associated with aggregations of animals around attractive resources. Here, we explore the behavior of potential hosts of non-trophically transmitted parasites at mesocarnivore carcass sites. We used videos recorded by camera traps at 56 red fox (Vulpes vulpes) carcasses and 10 carcasses of other wild carnivore species in three areas of southeastern Spain. Scavenging species, especially wild canids, mustelids and viverrids, showed more frequent rubbing behavior at carcass sites than non-scavenging and domestic species, suggesting that they could be exposed to a higher potential infection risk. The red fox was the species that most frequently contacted carcasses and marked and rubbed carcass sites. Foxes contacted heterospecific carcasses more frequently and earlier than conspecific ones and, when close contact occurred, it was more likely to be observed at heterospecific carcasses. This suggests that foxes avoid contact with the type of carcass and time period that have the greatest risk as a source of parasites. Overall, non-trophic behaviors of higher infection risk were mainly associated with visitor-carcass contact and visitor contact with feces and urine, rather than direct contact between visitors. Moreover, contact events between scavengers and carnivore carcasses were far more frequent than consumption events, which suggests that scavenger behavior is more constrained by the risk of acquiring meat-borne parasites than non-trophically transmitted parasites. This study contributes to filling key gaps in understanding the role of carrion in the landscape of disgust, which may be especially relevant in the current global context of emerging and re-emerging pathogens.Graphical abstract

Prevalence of some foodborne parasitic affection in slaughtered animals in local Egyptian abattoir

Fascioliasis, cysticercosis and hydatidosis were aimed to be investigated in some slaughtered animals (cattle, buffalo and camel) in local Egyptian abattoir located in Cairo governorate. 10317, 763 and 290 cattle, buffalo and camel carcasses, respectively were examined in the period of 2017-2018. Results of PM inspection along the investigation period revealed detection of Fasciola in 0.58 and 1.4% of the examined cattle and buffalo carcasses, respectively, while was not detected in camel carcasses. Also, cysticercosis was detected in 0.47 and 0.69% of the examined cattle and camel carcasses, respectively; while was not detected in buffalo carcasses. In addition, hydatidosis was detected in lung and liver of 0.038 and 0.096% of cattle carcasses; 3.4 and 1.03% of camel carcasses, respectively, while was not detected in the examined buffalo samples. Annual values of financial losses because of the condemned affected parts summed total of 11712.5, 32940.0 and 2410 LE due to fascioliasis, cysticercosis and hydatidosis, respectively along the investigation period (2017 and 2018). Referring to the obtained results, records of 2017 appeared to be more infection prevalent than 2018 with more financial losses, moreover, fascioliasis was the most prominent affection in the present study. In addition, the critical veterinary inspection has a great role in protecting human-being to be infected with zoonotic meat-borne parasites. So, magnification and great support should be given to training veterinary inspectors in slaughter houses in Egypt.

Prevalence of some zoonotic parasitic affections in sheep carcasses in a local abattoir in Cairo, Egypt

Meat-borne zoonotic parasites raised from consumption of undercooked and/or crossly contaminated meats can infect human by direct and/or indirect ways causing many mild to serious diseases; so, in the present study, some meat-borne transmissible parasites were investigated in 5239 freshly dressed sheep carcasses in local Egyptian abattoir located at Cairo governorate along the period of 2017-2018. Results of Post- Mortem inspection revealed the detection of Fasciola, Cysticercus and Hydatid cyst in 3.47, 1.06 and 1.83% of the total examined carcasses with total economic losses of 9306.78 L. E, 2892 L.E and 4380 LE, respectively. It is worthily noted that fascioliasis recorded the highest incidence of infection, followed by hydatidosis and cysticercosis in the examined carcasses, respectively. Cysticercus ovis and C. tenuicollis were detected in 32.14% and 67.85% with total economic losses of 714 L.E and 2178 L.E because of infected heart and liver condemnation during 2017 and 2018, respectively. Furthermore, hydatid cyst was detected in 0.47% and 1.35% of the examined lung and liver samples with total economic losses of 1188 L.E and 3192 L.E because of infected lung and liver condemnation during 2017 and 2018, respectively. Referring to the obtained results, it was obvious that parasitic infection of sheep meat and offal constrains a lot of economic losses, threatens the meat production industry and throws lights over the health importance of veterinary inspection great role in protecting human-being from be infested with zoonotic meat-borne parasites. So, magnification and great support should be given to training veterinary inspectors in slaughter houses in Egypt.

Meat-borne parasites in the Arab world: a review in a One Health perspective.

Meat-borne parasitic zoonoses are generally not well-monitored, and so understanding extent and overall prevalence is problematic. Without sufficient attention, their prevalence can become unexpectedly and unacceptably high. This review sheds light on meat-borne parasites in the Arab world, which includes all the Arab countries situated in the continents of Asia and Africa, with more than 400 million inhabitants distributed in 22 countries. Meat-borne parasites can be divided into two main categories-helminths and protozoa. The main helminths included in this review are Taenia saginata, Taenia solium, Taenia asiatica, Echinococcus spp., Fasciola spp., and Trichinella spiralis, while the meat-borne protozoan parasites are Toxoplasma gondii, Cryptosporidium spp., and Sarcocystis spp. In addition, Linguatula serrata, which belongs to the class Pentastomida, was included. Among those, the genus Taenia is the most frequently reported in the Arab world, particularly T. saginata. Many parasitic infections that are mainly transmitted through pork, although widespread in many parts of the world, are rare in the Arab countries, primarily due to religious proscriptions. The majority of the publications concerning meat-borne parasites were from Egypt, which contains the largest population in the Arab world and the highest population density, in addition to various economic, social, and environmental reasons.

Survival of Trichinella spiralis in cured meat products

Processing of meat is one possible approach to control meat-borne parasites. Processing methods such as freezing, cooking and irradiation are recommended for the control of Trichinella in pork, horse or game meat if specific technical conditions are fulfilled. Curing is a widely used preservation process influencing product characteristics such as shelf life, food safety, and taste. As curing methods are characterized by high parameter variability and predictions about inactivation of parasitic stages in raw meat products are difficult, curing and smoking are not recommended for Trichinella control.The objective of this study was to investigate the survival of T. spiralis in cured raw sausages taking into account water activity (aw-value), pH value, temperature, and time. For this purpose, four different types of sausage (Knackwurst, vacuum packed Knackwurst, short ripened salami, long ripened salami) were produced using T. spiralis infested batter. After production, the sausages were stored at product specific conditions for up to 35 days. During storage, pH value and aw-value of the sausages were monitored over time. Further, sausages of each type were digested using the magnetic stirrer method and the viability of the isolated larvae was assessed using a previously published larval motility test as a proxy for viability and infectivity of Trichinella larvae. In this context, we also introduce a three-level rated infectivity score (RIS) with a clear categorization scheme allowing the assessment of the infectivity of larvae.Based on the RIS, larvae isolated from the salamis were regarded as potentially infective until day 2 (short ripened salami) or day 3 (long ripened salami) post ripening, whereas in Knackwurst, potentially infective larvae were still found by day 8 post ripening. In contrast potentially infective larvae were detected in vacuum-packed Knackwurst until day 24 post ripening. Finally, using the RIS approach, data from previously published studies were collected and subjected to a correlation analysis to identify matrix factors linked to short Trichinella inactivation times.

Why we need a European focus on foodborne parasites

Foodborne parasites (FBP) are recognized as being a neglected pathogen group, often associated with marginalized or disadvantaged populations, especially those living in regions where water supply or sanitation are inadequate. Nevertheless, we are also increasingly recognising that FBP are not just restricted to such places, and even those that do have a circumscribed endemic area may also travel further in our globalised world; FBP are relevant everywhere, including Europe.Against this background, COST Action Euro-FBP (FA1408) was established and ran for a period of 4 years, addressing a number of different questions related to FBP, particularly in the European setting. In this special issue (SI), some of the issues and outputs associated with Euro-FBP are considered in greater depth, as an output also of the final Euro-FBP meeting. As well as more general issues regarding, for example, globalization and climate change, use of economic models, and the value of risk-based surveillance that puts the topic in perspective, individual articles are included that address specific parasites. These include protozoan parasites, such as Cryptosporidium, Giardia, and Toxoplasma, as contaminants of water, shellfish, and fresh produce, fishborne parasites such as Anisakid nematodes, and meatborne parasites, such as Trichinella. Some of the works provide specific data on occurrence or outbreaks, whilst others are concerned with techniques. In addition, implementation of some of the educational and collaborative tools that are unique to COST Actions are described. COST Actions are not generally intended to deliver a scientific endpoint, and Euro-FBP does not do so. However, the articles in this SI, along with other articles published elsewhere during and subsequent to the course of the Action, as direct outputs of the Euro-FBP activities, indicate that FBP are indeed a relevant topic for European scientists.

Ancient DNA from latrines in Northern Europe and the Middle East (500 BC–1700 AD) reveals past parasites and diet

High-resolution insight into parasitic infections and diet of past populations in Northern Europe and the Middle East (500 BC- 1700 AD) was obtained by pre-concentration of parasite eggs from ancient latrines and deposits followed by shotgun sequencing of DNA. Complementary profiling of parasite, vertebrate and plant DNA proved highly informative in the study of ancient health, human-animal interactions as well as animal and plant dietary components. Most prominent were finding of soil-borne parasites transmitted directly between humans, but also meat-borne parasites that require consumption of raw or undercooked fish and pork. The detection of parasites for which sheep, horse, dog, pig, and rodents serves as definitive hosts are clear markers of domestic and synanthropic animals living in closer proximity of the respective sites. Finally, the reconstruction of full mitochondrial parasite genomes from whipworm (Ascaris lumbricoides) and roundworm species (Trichuris trichiura and Trichuris muris) and estimates of haplotype frequencies elucidates the genetic diversity and provides insights into epidemiology and parasite biology.

Meat-Borne Parasites a Health Hazard Concern in the Sudan: A Review

Food-borne diseases in general have received more attention in the last decade, but little attention has been paid to parasitic food-borne infections. This is probably due to the fact that they are not associated with acute illness as bacterial and viral infections do. In the Sudan, the most important parasitic meat-borne infections are Taenia saginata, Toxoplasma gondii, Sarcocystis spp., Linguatula serrata and fish infection with trematode metacercaria. Control measures used in the country to prevent infection with these parasites are through inspecting meat in slaughterhouses for cysticercosis. Toxoplasma and Sarcocystsis infections are not considered during routine meat inspection due to lack of techniques for detection of these infections. Prevalence of infection with these parasites in humans and livestock in all States of Sudan is not available. Methods for routine diagnosis, monitoring or recording of these infections are inadequate, or not existing, in most of the laboratories. Studies are required to establish seroprevalence in livestock and humans. There is an urgent need to monitor and control meat-borne parasites using new technologies such as serological and molecular techniques, health education and vaccination. Researchers are urged to participate and establish innovative ways and means to control these diseases.

PARASITES TRANSMITTED TO HUMAN BY INGESTION OF DIFFERENT TYPES OF MEAT, EL-MINIA CITY, EL-MINIA GOVERNORATE, EGYPT.

Meat-borne parasites are Sarcocystis species, Toxoplasma gondii, Taenia saginata, Taenia solium and Trichinella spiralis. A total of 300 animals including 100 cattle, 100 goat, and 100 pigs, slaughtered in El-Minia governmental slaughterhouses. From each animal, five samples were taken from different muscles (esophageal, tongue and cardiac) and different organs (liver and brain). Meat samples were examined macroscopic and microscopic (direct, homogenization and H&E staining) for detection of the above-mentioned parasites. Serum samples were subjected to IHA for detection of T gondii specific antibodies. This study revealed that Sarcocystis species were the highest parasites that could be detected, with overall prevalence of 80%, which was statistically significant (P < or = 0.001). The digestion method was more sensitive than direct method for detection of Sarcocystis species. On the other hand, T. gondii was only diagnosed by using IHA test as 50.9% serum samples were positive, which was statistically significant (P < or = 0.004). Besides, 20% of examined battle were infected by Cysticercus bovis, and 12% of pigs were infected with C. cellulosae, but without statistical significant (P < or = 0.5).

Effects of irradiation on trans fatty acids formation in ground beef

In order to give the consumer the assurance that meat processed by irradiation is a safe product, a great deal of research has been developed in the world. The effect of irradiation on the hygienic quality of meat and meat products is considered as related to the control of meat-borne parasites of humans; elimination of pathogens from fresh meat and poultry; and elimination of pathogens from processed meat. Lipid oxidation and associated changes are the major causes of the quality deterioration of meat during storage. Irradiation of lipids induces the production of free radicals, which react with oxygen, leading to the formation of carbonyls, responsible for alterations in food nutritional and sensorial characteristics. Trans fatty acids are present in ground beef and can also be formed during its processing. Interestingly, the trans fatty acids, due to their chemical and physical characteristics, show more resistance to the oxidizing process. This property motivated us to investigate the level of the trans fatty acids, as well as the level of oxidation in irradiated ground beef. Irradiation of ground beef was performed by gamma rays from a 60Co source. The applied radiation doses were 0; 1.0; 2.0; 3.0; 4.0; 5.0; 6.0; 7.0 and 8.0 kGy. Lipid peroxidation in terms of TBA number and carbonyl content was monitored during storage. The sample characteristics and trans fatty acids composition were measured, following irradiation and after 60 and 90 days of storage at –10°C.

Detection of parasites in food.

The importance of foodborne parasitic zoonoses remains high in many regions of the world. Although control efforts have been exerted for quite some time, overall progress has not been satisfactory, even in many well developed countries. An important drawback in control programmes for parasites such as Trichinella, Toxoplasma and Taenia has been the absence of rapid, accurate and sensitive diagnostic tests for these meatborne parasites. However, the rapid advances in the molecular biology of these organisms has yielded concomitant gains in precision of detection. This review highlights these advances and their impact or potential application to the control of foodborne parasites.