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### Lesson 8: What can Reduce the Spread of Influenza?

Influenza, commonly called the flu, is a viral infection that is highly contagious. A variety of methods have been proposed to reduce the spread of flu throughout a school. Can you determine which method works the best at reducing the infection rate? Get ready to stop the spread!

### Doing the science

1. Start the Flu Transmission Simulation by clicking on the “Simulation” tab.
2. Select the “None” button under the Factor menu on the left-bottom of the screen.
3. Select the “Run” button at the bottom center of the screen.
4. Note the Progress bar, which shows time running for a six-week period.
5. Count and record in Table 1 the number of infected students at the end of the six weeks of the flu outbreak.
6. Select the “Hand Washing” button under the Factor menu.
7. Repeat steps 3 - 5.
8. Select the “Sanitizer Station” button under the Factor menu.
9. Repeat steps 3 - 5.
10. Repeat these steps for the last three factors: Antibiotics, Masks, and Quarantining.
11. Calculate the percentage of infected students out of the total population. To complete this calculation, divide the total number of infected students at the end of week 6 by 120 (the total population of students in the school). Multiply this value by 100 to convert it to a percentage. Enter these data into Table 1.

Table 1.

 Method Number of Infected Students at the end of Week 6 Percentage of Infected Students None Hand washing Sanitizer station Antibiotics Masks Quarantining

### Do You Understand?

1. Based on your results, which influenza protection strategy was most effective?

2. Which influenza protection strategy was least effective?

3. Which influenza protection strategy was most intrusive?

4. Which strategy was least intrusive?

5. If there were a real influenza outbreak at your school, which strategy would you recommend to your principal to stop the spread of the illness? Please explain your response.

6. Looking at the main simulation image, why do you think that no method tested was 100% effective in stopping the spread of the flu?

7. Return to the simulation and select the “None” factor and run the simulation again. This time select the “View Graph” button. Study the graph. Would you describe the relationship between the number of infections and number of weeks as being linear or exponential? Please support you answer with evidence.