Foodborne Illness: A Global Public Health Challenge

Foodborne illness is a significant public health problem affecting millions of people worldwide. Caused by the consumption of contaminated food or water, it leads to various infections, many of which are preventable. In countries with poor sanitation, diarrheal illnesses pose a severe threat, especially to young children. Diarrhea is a leading cause of malnutrition and mortality in children under five, with over 525,000 deaths annually, according to the World Health Organization (WHO). This underscores the urgent need for improved food safety and hygiene, especially in developing regions.

Current food trends, particularly the rise of raw or undercooked foods, have exacerbated the problem. Popular dishes such as steak tartare, marinated raw beef, undercooked goose liver, rare duck breasts, and sushi or sashimi have led to an increase in foodborne illnesses, particularly in developed nations like the United States. The popularity of raw fish dishes, in particular, has contributed to a rise in infections such as Anisakiasis, caused by parasites found in raw or undercooked fish.

Fish tapeworm infections, though rare with commercially canned fish, pose a serious risk when raw or improperly stored fish is consumed. The larval stage of the fish tapeworm can survive in iced fish for up to 400 days, highlighting the risks associated with global seafood consumption.

The global nature of food trade further complicates the issue. Increased international trade has heightened the risk of widespread outbreaks, as contaminated food can cross borders quickly. In recent years, large-scale outbreaks have affected multiple countries, revealing weaknesses in food safety regulations and the need for coordinated international responses.

Accurate estimates of the yearly incidence of foodborne diseases remain challenging due to inconsistencies in reporting systems across countries. Nonetheless, the growing incidence of foodborne illnesses highlights the need for stronger preventive measures, better global food safety protocols, and increased public awareness to combat this pervasive issue.
Foodborne Illness: A Global Public Health Challenge

What are foodborne diseases?

Foodborne diseases are infections or irritations of the gastrointestinal (GI) tract caused by food or beverages that contain harmful bacteria, parasites, viruses, or chemicals. Food may become contaminated by a variety of different agents, resulting in over 250 different foodborne diseases. Foodborne disease has emerged as an important and growing public health and economic problem in many countries during the last two decades.

The proportions of the population who are elderly, immunosuppressed or otherwise disproportionately susceptible to severe outcomes from foodborne diseases are growing in many countries. Globalization of the food supply has led to the rapid and widespread international distribution of foods.

Foodborne diseases can damage the structure and function of the intestines, leading to malabsorption, and can weaken the body’s immune system. When certain disease-causing bacteria or pathogens contaminate food, they can cause foodborne illness, often called “food poisoning”. Foods that are contaminated may not look, taste or smell any different from foods that are safe to eat. Salmonella, Campylobacter, Listeria and Escherichia coli are the most common bacteria causing foodborne illness.

Most foodborne diseases are infectious, caused by bacteria, viruses and parasites. Approximately 66% of all foodborne illness outbreaks are caused by bacterial pathogens. Of the 200 foodborne outbreaks reported each year, approximately 60% are of undetermined etiology.

Foodborne bacteria are often naturally present in food, and in the right conditions, a single bacterium can grow into more than two million bacteria in just seven hours.

Foodborne illness is a significant public health problem with major economic and social effects. Changed agricultural practices are part of the problem. Antibiotic use in farm animals is the primary cause of the increase in salmonellosis, now a major foodborne disease.

In countries with poor sanitation conditions, diarrheal illness is a leading cause of mortality and malnutrition in young children. Fish tapeworm infections have not been associated with properly canned commercial fish, but the larval parasite can survive up to 400 days in iced fish.

Food is produced in the primary industry sector (agriculture, aquaculture, fishing) and continues through manufacturing and retail to be prepared and consumed by the Australian public. Organisms causing foodborne illness can enter this food production chain at any stage. As a result of the increased global trade in food it is also likely outbreaks covering larger areas and affecting several countries will be recognized in larger numbers in the future.

Foodborne illnesses causes some combination of nausea, vomiting, and diarrhea that may or may not be bloody, sometimes with other symptoms. After eating tainted food, abdominal cramps, diarrhea, and vomiting can start as early as one hour or within three days depending on the foodborne pathogen, type of toxin and level of food contamination.
What are foodborne diseases?

Foods associated with foodborne illness

A foodborne is considered to be any illness associated with or in which the causative agent is obtained by the ingestion of food.

Food poisoning is considered to be an illness caused by the consumption of food containing microbial toxins or chemicals poisons.

In recent years, the variety of foods associated with foodborne illness has increased.

While the food supply in the United States is one of the safest in the world, the CDC estimated that 76 million people get sock, more than 300,000 are hospitalized and 5,000 Americans die each year from foodborne illnesses.

Raw foods of animal origin are the most likely to be contaminated; there are, raw meat and poultry, raw eggs, unpasteurized milk, and raw shellfish. Because filter-feeding shellfish strain microbes from the sea over many months, they are particularly likely to be contaminated if there are any pathogens in the seawater.

Animal products such as meat, poultry, seafood, dairy products and eggs are the foods most likely to cause outbreaks of human illness in the United States.

A single hamburger may contain meat from hundreds of animals. A single restaurant omelet may contain eggs from hundreds of chickens. A glass of raw milk may contain milk from hundreds of cows. A broiler chicken carcass can be exposed to the drippings and juices of many thousands of other birds that went through the same cold water tank after slaughter.

It was estimated that meat and poultry related foodborne illness accounted for 27% of total food related cases and outbreaks between 1990 and 2003.

Fruits and vegetables consumed raw are a particular concern. Washing can decrease but not eliminate contamination, so the consumers can do little to protect themselves.

Fresh manure used to fertilize vegetables can also contaminate them. Alfalfa sprouts and other raw sprouts pose a particular challenge, as the conditions under which they are sprouted are ideal for growing microbes as well as sprouts, and because they are eaten without further cooking.

Epidemiological studies found that there are many kinds of potential error during food production, distribution or preparation that allows microbial pathogens to contaminate food. This includes:
*The use of contaminated raw food
*Cross contamination of prepared food by contaminated raw food
*Poor personal hygiene by infected food handlers
*Inadequate cleaning of equipment
*Inadequate cooling or reheating
*Improper holding temperatures
*Cooling food too slowly after heating
*Eating food too long after preparation

To provide protection against foodborne illness, it is necessary to have up-to-date knowledge of production, harvesting and storage techniques to accurately evaluate the quality and safety of raw material.
Foods associated with foodborne illness