Student Exploration: Disease Spread
Student Exploration: Disease Spread
Student Exploration: Disease Spread
1. Why do you think it is important to cover your mouth when you cough?
So any germs u have in you mouth, won’t spread around when u cough
2. Why should you always wash your hands before you eat?
you can have germs in your hands and when u touch the food all the germs u had in your
hand geting in the food.
Gizmo Warm-up
When a person has a disease, his or her normal body functions are
disrupted. Some diseases, such as diabetes and most cancers, are not
spread from one person to another. But other diseases, such as the flu
and strep throat, can be spread. These diseases are known as
infectious diseases. Infectious diseases are caused by viruses,
bacteria, and other agents known as pathogens.
In the Disease Spread Gizmo, you will be able to observe how various
pathogens can spread through a group of people. Click Play ( ) and
observe.
people are starting to move around the room. It is likely that after a person visits the buffet
table, they will turn green. The number of green individuals is growing over time.
2. Look at the color key on the bottom right of the Gizmo. What is happening when a person changes color?
A person changes color during the simulation to show that the person has been infected
with a disease. The color green means that the person is sick with a foodborne disease.
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Get the Gizmo ready:
Activity A: ● Click Reset ( ).
● On the CONTROLS tab under Active Diseases,
Person-to-person turn off Foodborne and turn on Person to
transmission person.
● Set the Number of people to 5.
Question: What factors affect how quickly a pathogen spreads from person to person?
1. Predict: Some pathogens are spread directly from one person to another. This can happen when people
come into direct contact or share items, such as drinking glasses. What do you think might affect how
quickly a pathogen is spread from person to person?
2. Identify: Select the SIMULATION tab on the left and the TABLE tab on the right. (You will want the table tab
open to answer question C.)
3. Experiment: Click Reset. Change the Number of people to 15. Click Play, and record how long it takes to
infect five people. Repeat this four times for a total of 5 trials, and calculate the mean time. Repeat the
experiment when there are 25 people and 35 people in the room.
Number of people Time to infect five people, 5 trials (h) Mean time (h)
15
25
35
4. Interpret: Study the data you collected. What trend do you see in the data, and how would you explain it?
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5. Experiment: Not all pathogens are equally infectious. Click Reset. Set the Number of people to 20. Under
Probability of transmission, select Low for Person to person.
On the SIMULATION tab, click Play. Record the time it takes to infect five people for five trials, and find the
mean. Then repeat the experiment with a medium and high probability of transmission. (Note: For the
“Medium” setting, move the slider half-way between the Low and High positions.)
Transmission probability Time to infect five people, 5 trials (h) Mean time (h)
Low
Medium
High
6. Interpret: Study the data you collected in the table above. What trend do you see in the data, and how
would you explain it?
7. Analyze: On the CONTROLS tab, place the Probability of transmission slider under Person to person
half-way between Low and High. Select the SIMULATION and GRAPH tabs. Click Play.
8. Apply: An epidemic is the rapid spread of an infectious disease. How do you think a government could try
to prevent an epidemic of a dangerous person-to-person pathogen?
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Activity B: Get the Gizmo ready:
● Click Reset.
Foodborne and ● On the CONTROLS tab under Active diseases,
airborne turn off Person to person and turn on
transmission Foodborne.
1. Predict: How do you expect the spread of a foodborne disease to be similar to and different from the
spread of a person-to-person disease?
2. Observe: Select the SIMULATION tab. Click Play and closely watch the people moving around the room.
A. What does each person do just before
becoming infected?
3. Analyze: Select the GRAPH tab, and wait for every person to become infected.
A. At what time did the disease spread most
slowly? Most quickly?
4. Compare: How does the spread of a foodborne pathogen compare to the spread of the person-to-person
pathogen you studied in activity A?
5. Predict: How would you expect the spread of an airborne disease to be similar to and different from the
spread of a foodborne disease and a person-to-person disease?
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6. Experiment: Run a few simulations with the airborne pathogen.
7. Think about it: Suppose there is an infectious disease at a party. How could doctors tell if the disease was
foodborne, airborne, or transmitted person to person?
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