What Are Food Transmission Diseases?
Food transmission diseases, also known as foodborne illnesses, occur when harmful microorganisms or substances contaminate food or beverages. In Australia, over 4.1 million cases are reported annually, many of which are preventable.
These illnesses can affect anyone but pose the highest risks to:
- Older adults
- Young children
- Pregnant women
- Immunocompromised individuals
Key Characteristics
| Type | Description |
| Foodborne infection | Caused by ingesting live pathogens like Salmonella or Norovirus. |
| Foodborne intoxication | Caused by consuming toxins produced by bacteria such as Staphylococcus aureus. |
Common Terms Explained
| Term | Meaning |
| Foodborne illness | Illness from contaminated food or drink |
| Food poisoning | Common term for foodborne illness |
| Zoonoses | Diseases passed between animals and humans |
| Pathogens | Disease-causing microorganisms |
| Incubation period | Time between exposure and symptom onset |
How Do Foodborne Illnesses Spread?
Contamination can happen at any stage of the food supply chain—from farm to fork. Transmission may be biological, chemical, or physical, and commonly spreads through:
Common Pathways
- Direct contact: Raw meats touching cooked or ready-to-eat foods
- Indirect contact: Contaminated hands, utensils, or surfaces
Pathogens Entering the Food Chain
| Stage | Example Contamination |
| Farming | Contaminated soil or water |
| Processing | Poor sanitation on equipment |
| Transport | Incorrect temperature control |
| Food service | Improper hygiene, storage, or preparation |
Risky Practices
- Unwashed hands after toilet use
- Using the same knife for raw and cooked foods
- Storing raw meat above ready-to-eat items
- Not checking fridge temperatures
Tip: Always use a food thermometer and separate chopping boards to avoid cross-contamination.
Common Foodborne Pathogens in Australia
Australia regularly experiences outbreaks caused by these key pathogens:
Bacterial Pathogens
| Pathogen | Common Sources | Symptoms |
| Salmonella | Eggs, poultry, fresh produce | Diarrhoea, cramps, fever |
| Listeria monocytogenes | Deli meats, soft cheeses | Fever, miscarriage risk, meningitis |
| E. coli | Undercooked beef, unpasteurised milk | Cramps, bloody diarrhoea |
Viral Pathogens
| Virus | Sources | Symptoms |
| Norovirus | Salads, fruits, seafood | Vomiting, diarrhoea |
| Hepatitis A | Contaminated food or water | Fatigue, jaundice, nausea |
Parasites & Mould
While less common, these are still present:
- Giardia, Cryptosporidium
- Aspergillus (mould) – Often from imported or poorly stored food
Symptoms of Food Transmission Diseases
Symptoms typically appear within hours to a few days. Severity depends on the pathogen and the individual’s health.
Mild to Moderate Symptoms
- Nausea, vomiting
- Diarrhoea
- Abdominal cramps
- Fever under 38.5°C
- Fatigue, appetite loss
Severe Symptoms
- Bloody diarrhoea
- Fever above 38.5°C
- Dehydration
- Persistent vomiting
- Risk of hospitalisation (particularly in vulnerable groups)
High-Risk Foods & Environments
Foods Most Likely to Be Contaminated
- Raw or undercooked poultry and minced beef
- Eggs and raw egg-based products (e.g. mayonnaise)
- Unpasteurised milk or soft cheeses
- Ready-to-eat deli meats
- Fresh produce handled unsafely
High-Risk Settings
- Aged care kitchens
- Hospitals and childcare centres
- Buffets and mobile food vendors
- Cafés and catering businesses
How to Prevent Foodborne Illness
Australia follows the World Health Organization’s Five Keys to Safer Food: cleanliness, separation, cooking, safe storage, and clean water.
Safe Food Handling
- Cook poultry to at least 75°C
- Keep hot food above 60°C, cold food below 5°C
- Avoid mixing raw and cooked items
- Use thermometers to verify temperatures
Personal Hygiene
- Wash hands with soap for at least 20 seconds
- Clean under fingernails and avoid wearing jewellery
- Do not prepare food when ill
- Use gloves and aprons where required
Learn more: Safe Food Australia – FSANZ
Training & Certification for Food Handlers
Proper training reduces the risk of contamination. In Australia, common certifications include:
These are essential in hospitality, aged care, childcare, and food retail.
Diagnosis, Treatment & When to Seek Help
Diagnosis
Doctors may conduct:
- Stool or blood tests
- Review of recent food exposure
Treatment
Most cases resolve with rest and fluids. Severe cases may require:
- Oral or intravenous rehydration
- Antibiotics (for specific bacterial infections)
- Hospital care
Seek medical help if:
- Symptoms persist beyond 48 hours
- High fever or dehydration is present
Outbreak Management & Reporting in Australia
Reporting Requirements
- Individuals: Notify GP and local public health unit
- Businesses: Report outbreaks to state health authorities
- Employers: Temporarily remove affected staff from duties
Government Oversight
- OzFoodNet – Monitors foodborne outbreaks
- FSANZ – Develops safety standards and risk assessments
- State Health Bodies – Manage local responses
Ongoing Prevention – What You Can Do
Workplace Food Safety Culture
- Encourage reporting of unsafe practices
- Conduct internal food safety audits
- Offer regular training and updates
Innovations in Food Safety
- Digital tools for temperature monitoring and supply tracking
- AI to detect contamination risks
- HACCP systems for proactive risk management
Frequently Asked Questions (FAQs)
What is a food transmission disease?
An illness caused by consuming food or drink contaminated by bacteria, viruses, or parasites.
How do foodborne diseases spread?
Through poor hygiene, unsafe food handling, cross-contamination, and undercooking.
How soon do symptoms appear?
Anywhere from a few hours to several days after exposure.
Which foods are most risky?
Raw meats, unpasteurised milk, deli meats, and mishandled fresh produce.
What should I do if I suspect food poisoning?
Stay hydrated, rest, and consult a doctor if symptoms worsen.
Are foodborne illnesses contagious?
Yes, particularly viral types like Norovirus, which spread between people.
How are outbreaks monitored?
Via OzFoodNet, FSANZ, and state health departments.
Key Takeaways
- Foodborne illnesses are common in Australia but largely preventable.
- Key culprits include Salmonella, Listeria, and Norovirus.
- High-risk foods include raw meats, eggs, and ready-to-eat items.
- Certification such as the FSS enhances workplace safety.
- National surveillance systems ensure rapid response to outbreaks.
