Turn your students into science detectives with this NO PREP, engaging, real-world investigation focused on foodborne illness and digestive system infection. In this case file activity, students analyze medical data, examine laboratory test results, track pathogen pathways, rank possible causes, and build a scientific case to solve the mystery of why patients are experiencing nausea, vomiting, diarrhea, fever, dehydration, and immune response symptoms after a shared event.

Instead of passively reading about bacteria and food safety, students actively investigate, analyze patterns, and reason through the evidence to uncover how contaminated food leads to infection and spreads through the body. It makes a complicated public health topic interactive, engaging, and easy to understand.

✅ NO PREP, no formatting, no issues.
Simply download and go. Includes all instructions, answer key, rubric, and background reading students need to solve the case.

10-Part Activity Breakdown

Part 1 – Mission Briefing:
Students are introduced to the outbreak case involving multiple patients experiencing digestive illness symptoms after a shared food event.

Part 2 – Background Reading:
Students build foundational knowledge about foodborne illness, pathogens, digestive infection, immune response, and dehydration.

Part 3 – Evidence Log:
Students examine 10 detailed evidence cards related to rapid symptom onset, shared food sources, undercooked poultry, improper storage, cross-contamination, immune response markers, dehydration, laboratory confirmation, secondary spread, and delayed reporting.

Part 4 – Suspect Ranking:
Students rank possible causes of the outbreak (undercooked food, improper storage, cross-contamination, poor hygiene, contaminated water) and justify their reasoning using scientific evidence.

Part 5 – Pathway Tracking:
Students trace how contamination moves from food source → digestive infection → immune response → whole-body impact.

Part 6 – Impact Analysis:
Students analyze how infection affects organs (stomach and intestines), cells (intestinal lining damage), and the whole body (dehydration and weakness).

Part 7 – The Big Question:
Students explain how a localized contamination event developed into a serious public health problem.

Part 8 – CER Writing:
Students construct a scientific argument using Claim–Evidence–Reasoning.

Part 9 – Solutions & Action Plan:
Students propose personal, community, and medical prevention strategies.

Part 10 – Reflection:
Students reflect on what surprised them and how food safety knowledge impacts real-life decisions.

What Students Will Learn

• What foodborne illness is and how contamination occurs
• How bacteria like Salmonella infect the body
• Why undercooking and improper storage allow bacteria to multiply
• How cross-contamination spreads pathogens
• How the immune system responds to infection
• Why white blood cell counts increase during illness
• How vomiting and diarrhea lead to dehydration
• How pathogens can spread person-to-person
• Why delayed reporting worsens outbreaks
• How to use Claim–Evidence–Reasoning (CER) to support scientific explanations

This activity blends life science, human biology, health science, critical thinking, and literacy skills into one high-interest, structured lesson that keeps students thinking like real public health investigators.

You can find this Mystery Activity as well as the others I have created inside my Human Body Systems & Health Mystery Activity Bundle at a significant discount.

This Mystery Is Perfect for:

• Life science and human body systems units
• Digestive system lessons
• Biology lessons
• Sub plans, review days, or project-based learning

No prep, no formatting, no issues.

Simply download, print (or upload to your class site) and you're all set.

What’s Included

• A complete student case file with guided worksheets for every step of the investigation
• 10 detailed evidence cards based on real-world medical issues --> Evidence cards include two versions: one with images and one without images
• A full teacher answer key with sample responses and grading support
• A full marking rubric that covers all key aspects of the mystery activity

Why Teachers Love This Resource

• Fully structured and print-and-go – Everything is ready to use with clear directions and built-in scaffolding
• High engagement without extra classroom management – The detective format naturally hooks students
• Real-world relevance students immediately understand
• Builds both science and ELA skills – Includes analysis, explanation, and CER writing
• Flexible for any schedule – Use in one class period, over two days, or as a mini-project

Time Required

• 2 class periods
• Can be extended into a 3-day mini-project

The following Mystery Activities can be found inside my Human Body Systems & Health Mystery Activity Bundle.

1. The Circulatory System Breakdown Mystery
2. The Digestive System Malfunction Mystery
3. The Viral vs Bacterial Illness Mystery
4. The Cellular Respiration Breakdown Mystery
5. The Stress Response & Health Breakdown Mystery
6. The Integumentary System Disorder Mystery
7. The Respiratory System Failure Mystery
8. The Antibiotic Resistance Mystery
9. The Oxygen Delivery Crisis Mystery
10. The Substance Abuse Impact on Body Systems Mystery
11. The Blood Sugar Balance Mystery
12. The Foodborne Illness Outbreak Mystery
13. The Musculoskeletal System Injury Mystery
14. The Nutrition and Diet Health Mystery
15. The Sleep Deprivation Health Mystery
16. The Autoimmune Disorder Mystery
17. The Blood Types Mystery
18. The Dehydration & Electrolyte Imbalance Mystery
19. The Immune System Breakdown Mystery
20. The Screen Time Addiction & Mental Health Mystery

Google Classroom and Distance Learning Ready

• This resource is perfect for in-class or distance learning and integrates seamlessly with Google Classroom.
• It automatically creates a copy of the reading and places it directly into your Google Drive with a single click.
• Purchase → Open → Click → Assign to your students
• The reading also includes a Microsoft Word and PDF version.
• Having all three options allows you to assign the activity without worrying about formatting issues, and ensures access for all students regardless of device or learning environment.

No prep, no formatting, no issues. Simply download, print (or upload), and you're all set.

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If you have any questions please feel free to send me an email - devon@teachwithfergy.com