Food born diseases presentation

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Overview Organisms Epidemiology Transmission Foodborne illness Prevention and Control High Risk Groups Produce Processing Important Organisms

Transcript of Food born diseases presentation

  • 1.Food borne :Diseases By: Dr. Amr El-Dakroury Dept. of Medical commission Supreme Council of Health

2. :The etiology of Food-borne diseases Food-borne diseases are those diseases that are the result of exposure to pathogenic microorganisms, such as bacteria, viruses and parasites, which tend to have acute effects on human health. However, chronic, and in some cases acute, food-borne illness may also be caused by the presence of various chemical substances including residues of pesticides and veterinary drugs, unlawful food additives, mycotoxins, biotoxins and radionuclides that enter the food intentionally or unintentionally. The problems :due to consumption of contaminated food and its detrimental effect on human health . 3. :Epidemiology of FBD WHO estimates that one in three people worldwide suffer from a food-borne disease every year, 1.8 million die from severe food and waterborne diarrhea ,related illness Most of these illnesses are due to microorganisms and chemical contaminants, which may occur naturally or be introduced at some point along the food chain. Campylobacter and Salmonella species account for over 90% of all reported cases of bacteria related to food poisoning worldwide. As most cases of food borne disease are not reported, the true dimension of the problem is unknown. Today food safety is one of WHOs top eleven priorities 4. :Food safety and security The World Food Summit, organized by FAO in 1996, recognized that access to safe food is in itself an element of food security, The World Health Assembly Resolution on Food safety from May 2000 stated that : 1. Everyone should have the right to an adequate supply of safe, nutritious food , 2. Encourages WHO member states to implement and keep national and, when appropriate, regional mechanisms for food borne disease surveillance 3. Governments should take the necessary measures to ensure the availability of safe food for all in order to sustain the health and economic development of their people. 5. The Response in Qatar The Programme on Food- and Waterborne Diseases and Zoonoses (FWD) in Qatar was set up with the establishment of SCH ,One of the key objectives for the programme is improving and harmonizing the surveillance system in Qatar in order to increase the scientific knowledge regarding etiology, risk factors and burden of food- and waterborne diseases and zoonoses.at present covers the following diseases: brucellosis, campylobacteriosis, cholera, giardiasis, hepatitis A, salmonellosis, shigellosis, toxoplasmosis, typhoid and paratyphoid fever, Escherichia coli infection, 6. Reported food Borne Cases During 2006 -2010 in Qatar 40003511 3500 3000 25001889200013981500 1000 5003121564040 BrucellosisFood poisoningOther Infc.Diarrhea (N.Diarreh)SalmonellaShegellosisTyphoid 7. :Objectives of the FWD programme Improving and harmonizing surveillance and control interventions of FWD Improving knowledge of prevention and control of FWD Strengthening SCH and Stakeholders capacities in the area of FBD . Improving early detection and coordinated response to Qatar-wide FWD outbreaks ,as well as control interventions . Facilitating collaboration between public health, municipality veterinary and food sectors 8. surveillance activities in Qatar Food borne disease data collected through : 1. Routine surveillance activities 2. Outbreaks investigations and 3. Conducting special studies. 9. :Aims of FBD surveillance system Food borne disease surveillance is essential for: 1. Estimating the burden of food borne diseases, and monitor trends; 2. Identifying priorities and setting policy in the control and prevention of food borne diseases; 3. Detecting, controlling and preventing food borne disease outbreaks; 4. Identifying emerging food safety issues; and evaluating food borne disease prevention and control strategies. 10. Overview Organisms Epidemiology Transmission Foodborne illness Prevention and Control 11. Organisms There are an estimated 250 pathogens that can cause foodborne related illnesses.Foodborne illness is defined as two or more cases of a similar illness resulting from ingestion of a common food. It can result from consuming foods contaminated with various pathogens. In most cases bacteria arethe major pathogen followed by viruses, then parasites. However, natural or manufactured chemicals and toxins from organisms can also cause foodborne illnesses. The most commonly recognized foodborne infections are caused by Campylobacter, Salmonella, E. coli O157:H7 and by caliciviruses (better know as Norwalk viruses.) 12. Epidemiology 13. Epidemiology Many foodborne illnesses are not recognized or go unreported for a variety of reasons: First, routine surveillance may not detect a mild foodborne illness. second, some of the same pathogens that cause foodborne illness can also be transmitted in water or from person to person. Lastly, some pathogens are emerging and are not yet identifiable or able to be diagnosed. Considering these factors, the above listed number of illnesses, hospitalizations and death may be obsolete. 14. High Risk Groups The elderlyChildrenImmunocompromised individuals are usually at the greatest risk for these illnesses. 15. Transmission 16. Transmission Transmission of foodborne pathogens occurs via the oral route.How those pathogens contaminate food can vary based on the organism, its reservoir, food handling/processing, and crosscontamination prior to serving.Some organisms rely on a human reservoir, such as Norwalk-like virus, Shigella, Campylobacter.Others have an animal reservoir such as Campylobacter, Salmonella, E. coli 0157:H7, Listeria, and Toxoplasma. 17. Transmission Contamination can occur at several points along the food chain On the farm or in the field At the slaughter plant During processing At the point of sale At home 18. Produce Processing Animal products are not the only food that can be contaminated. Various foodborne disease outbreaks have occurred due to fruits and vegetables.This table indicates the many possible sources for contamination during the processing of produce. 19. Important Organisms Although many pathogens can cause foodborne illnesses, we will briefly cover those of greatest impact. These may also be potential bioterrorism agents for food sources. 20. Important Organisms Norwalk-like viruses Campylobacter Salmonella E. coli O157:H7 Clostridium botulinum Shigella Toxoplasma Emerging organisms 21. Norwalk-like Viruses Norovirus; Caliciviridae family They are an important cause of sporadic gastrointestinal disease outbreaks throughout the world. It is considered the most common foodborne infectious agent and an estimated 23 million cases occur each year. Sources Person-to-person : Shed in human feces (up to 2weeks), vomitus. Outbreaks in daycares, nursing homes, cruise shipsContaminated raw shellfish. 22. Campylobacter jejuni Leading cause of bacterial diarrhea. It is considered the leading bacterial cause of foodborne related diarrhea affecting 2.4 million people each year (5-14% of all diarrheal illnesses worldwide). Usually these are children under the age of 5 and young adults (15-29 years of age). Very few deaths are caused by this organism. Recently GuillainBarr Syndrome has been associated with a small number of Campylobacter cases. This syndrome is the leading cause of acute paralysis and develops 2-4 weeks after a Campylobacter infection (after diarrheal signs disappear). 23. Campylobacteriosis It is caused primarily by Campylobacter jejuni, but also C. fetus and C. coli.Sources Raw or undercooked poultry Non-chlorinated water Raw milk Infected animal or human feces Poultry, cattle, puppies, kittens, pet birdsClinical signs Diarrhea, abdominal cramps, fever, nausea Duration: 2-5 days 24. Salmonellosis Salmonella is a gram negative bacteria with many serotypes that cause foodborne related illnesses. The ones we most commonly associated with human foodborne illness are S. typhimurium and S. enteritidis They account for about 41% of all human cases reported causes an estimated 1.4 million reported cases annually with 580 deaths 25. Salmonellosis Sources Raw poultry and eggs Raw milk Raw beef Unwashed fruit Reptile pets: Snakes, turtles, lizardsSigns Onset: 12-72 hours Diarrhea, fever, cramps Duration: 4-7 days 26. E. coli O157:H7 Escherichia coli is another major pathogen of foodborne related illnesses. Harmless strains of E. coli are found in nature, including the intestinal tracts of humans and animals. Diarrheal disease is caused by several different strains of harmful E. coli. The most dangerous type is enterohemorrhagic E. coli (EHEC). It gets its name because it can cause bloody diarrhea and can lead to kidney failure in children or immunocompromised persons. E. coli O157:H7 is the most common EHEC and its enterohemorrhagic toxin is what actually causes the disease 27. E. coli O157:H7 Signs Watery or bloody diarrhea, nausea, cramps Onset: 2-5 days Duration: 5-10 days SequelaHemolytic Uremic Syndrome (HUS) Most commonly affecting children. HUS is the most common cause of acute kidney failure in children. 28. Botulism Botulism is caused by a neurotoxin from Clostridium botulinum This toxin causes flaccid paralysis and cranial nerve deficits, and can lead to death. The most common sources are home-canned foods, fermented meats and honey Signs Double vision, drooping eyelids, difficulty speaking and swallowing Onset: 18-36 hours 29. Shigellosis Shigellosis is also known as bacillary dysentery Most cases are caused by Shigella sonnei. However, S. dysenteriae, S. flexneri and S. boydii can also cause foodborne related illnesses. Sources: Human fecal contamination of food, beverages, vegetables, waterSigns: Watery or bloody diarrhea, nausea, vomiting, cramps, fever Onset: 2 days Duration: 5-7 days 30. Toxoplasmosis Toxoplasmosis is caused by an intracellular protozoan, Toxoplasma gondiiIt is one of the three leadi