John Hay Biomedical · Medical Interventions · September 8, 2026
Day 1 evidence guide

Outbreak Day 1
Evidence and connections

Today: make seven case notes and a labeled contact map. Submit them together as one PDF. Keep an editable copy for our next lesson.

Stop at Checkpoint A. Research and conclusions come next. Do not open the official Day 2 or Day 3 evidence yet.

1. Open your sources

Use the Medical Interventions PLTW hub in Schoology. Open 1.1.2 Investigating an Outbreak, then its linked Outbreak Investigation Day 1 sheet. Use all three pages of that sheet.

If a required file will not open, tell me which one. You may set up the note headings below while I help. Do not invent case facts.

2. Read the rule and Model M

A sign is something another person observes or measures. A symptom is something a person experiences and reports. Read how each clue was collected before labeling it.

An exposure is contact with a possible source of illness. A contact map shows stated connections between people. A connection alone does not prove infection or show who infected whom.

Model M is original simulated practice. M1 reports a headache. A clinician measures M2's temperature at 38.2 degrees Celsius. The record says both attend the same club.

• M1: headache, a reported symptom.
• M2: temperature of 38.2 degrees Celsius, a measured sign.
• Connection: M1 and M2 attend the same club. Transmission is not established.

Try it: Does this record show which person became ill first? Check: no timing is supplied, so write “not stated.” Do not add Model M to the official case evidence.

3. Build your case notes and map

Use one copy of this outline for each of the seven main Day 1 histories. Record the source's units. Write “not stated” when a field cannot be answered.

Next, connect the people using facts from the Day 1 sheet. Label every line with the stated connection and source page. Include other named contacts when relevant.

You may draw the map on paper or write a connection list. For a list, use one line per connection: “Person A is connected to Person B because [source fact], page [number].”

Do not add arrows claiming a direction of infection. A person mentioned in a history may be a contact without being one of the seven main cases.

4. Check and submit once

• I included all seven main histories and their source pages.
• I kept measured or observed clues separate from reported symptoms.
• Every map connection has a label supported by the sheet.
• I marked unknowns and used only Day 1 evidence.

Submit your September 8 case notes and contact map as one PDF in Schoology. Include clear photos if you drew the map on paper. Open the PDF and check that every page is readable before uploading. Keep your editable copy. Check Schoology for the deadline.

Need help? Open the Schoology upload guide.

Next we will revise this record and research possible explanations. This checkpoint does not complete the whole PLTW activity.

Help if you get stuck