Infectious Diseases Intro

Grade Level

7th Grade

Duration

45 minutes

Class Size

15 students

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Standards Alignment

Next Generation Science Standards (NGSS)

• MS-LS1-1: Conduct an investigation to provide evidence that living things are made of cells; relate understanding to organisms and life processes (foundation for understanding diseases)
• MS-LS1-3: Use argument supported by evidence for how the body is a system of interacting subsystems composed of groups of cells
• MS-LS4-4: Construct an explanation based on evidence for how natural selection leads to adaptation of populations (linked to pathogens and human defense)
• Science and Engineering Practices: Engaging in argument from evidence; Obtaining, evaluating, and communicating information
• Crosscutting Concepts: Cause and effect, Systems and system models

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Lesson Objectives

By the end of this lesson, students will be able to:

1. Define infectious diseases and identify common examples relevant to 7th graders.
2. Describe the primary causes of infectious diseases (bacteria, viruses, fungi, parasites).
3. Explain at least three ways infectious diseases can spread.
4. Discuss the impact infectious diseases have on individuals and communities.
5. Engage in collaborative discourse using evidence to explain infectious disease transmission.

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Materials Needed

• Whiteboard and markers
• Chart paper for group work
• Printed or digital infectious disease cards (each card lists a disease with brief facts)
• Colored sticky notes for categorizing causes and spread methods
• “Infectious Disease Detective” worksheets (custom worksheet with guided questions)
• Timer or stopwatch
• Mini hand sanitizer bottles for demonstration

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Lesson Outline

1. Warm-Up Discussion (5 minutes)

• Prompt: "What comes to mind when you hear 'infectious disease'?"
• Write student responses on the whiteboard, grouping similar ideas.
• Highlight common diseases (flu, COVID-19, chickenpox, strep throat).
• Introduce formal definition: “Infectious diseases are illnesses caused by organisms that can be passed from one person to another.”

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2. Direct Instruction & Interaction (10 minutes)

• Brief presentation covering:
  • Causes of infectious diseases (4 types of pathogens: bacteria, viruses, fungi, parasites). Use simple visuals or diagrams showing microbes vs. human cells.
  • Methods of spread: direct contact, airborne, contaminated surfaces, vectors like mosquitoes.
• Use slides or a short engaging video (teacher’s choice) illustrating each pathogen and spread method.
• Ask quick check questions after each segment (e.g., “Can viruses be killed with antibiotics? Why or why not?”).

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3. Group Activity: Infectious Disease Detective (15 minutes)

• Divide students into 3 groups of 5.
• Each group receives a set of infectious disease cards (one per student). Examples: Influenza, Salmonella, Athlete’s foot, Malaria, Common cold.
• Task: Identify the cause and method of spread for each disease on their cards. Use reference facts on the cards and sticky notes to classify cause & spread on their assigned chart paper.
• Groups discuss and prepare to share their findings.
• Circulate to facilitate, prompting with questions like:
  • “How do you think this disease spreads in schools?”
  • “What might happen if no one knew how to stop this?”

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4. Group Presentations & Class Discussion (10 minutes)

• Each group presents 2-3 findings briefly (1-2 minutes per group).
• Class discusses: Which diseases are most common in their community? Which are more dangerous and why?
• Introduce the idea that understanding causes and spread helps prevent illness.

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5. Exit Ticket: Reflection & Quick Write (5 minutes)

• On the “Infectious Disease Detective” worksheet, students write brief answers:
  • Define infectious disease in your own words.
  • Name one way infectious diseases spread and why stopping that spread matters.
  • One question or interesting fact you learned today.

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Assessment

• Formative: Observations during warm-up, group discussions, presentations; response to quick check questions during instruction.
• Exit Ticket: Evaluate understanding of key concepts and students’ ability to articulate basic definitions and spread mechanisms.

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Differentiation & Extensions

• Support: Provide sentence starters or word banks on the worksheet for ELL and special education students. Allow diagrams to support explanations.
• Challenge: Students interested can research a less common infectious disease on their own and present a “disease profile” in Lesson 2.
• Extension Activity: Create posters or infographics illustrating how personal hygiene habits reduce disease spread.

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Teacher Notes & Tips

• Emphasize simple language and relatable examples since 7th graders are developing abstract thinking but still need concrete connections.
• Use real-world events like seasonal flu outbreaks or recent pandemics to make content relevant and engaging.
• Encourage curiosity and empathy: Discuss how understanding diseases protects others in the community, reinforcing the science-society connection.

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This introductory lesson sets up the foundational knowledge and curiosity to explore the immune system’s role in fighting infectious diseases in subsequent lessons of the unit.