ࡱ> { 1bjbjBrBr 4  )BBT3(d3f3f3f3f3f3f3$5e83o"33h$h$h$d3h$d3h$h$N1|1zhF1P33031 9@ 9$11 93LhJh$C<?33!z3 9B b: AP Environmental Science Wheeler High School Mr. Walstead Online Disease Lab From:  HYPERLINK "http://www.learner.org/courses/envsci/interactives/disease/" http://www.learner.org/courses/envsci/interactives/disease/ Lesson 1 > The Virgin Field > Step 1 Most diseases begin with what is called "the virgin field"a scenario in which humans have no natural or man-made immunity to the disease. To see the progress of a disease in a particular community, start by predicting how many sick days will be reported when you run the Kold disease through a medium-sized population, and record your prediction in the  HYPERLINK "http://www.learner.org/courses/envsci/interactives/disease/data_table_disease.doc" data table. In this first run-through, we'll assume that the population does not move around the field; they interact with their neighbors, but do not travel long distances. Make sure the tableau is set to virgin and run the simulator to 100 days (click on Run button) three times and answer the following: Do you get the exact same results each time? How do the results compare to each other and to your prediction? What factors might contribute to susceptibility to the disease? If the contagion rate is calculated as the number of new cases per day per total population, what would the average contagion rate be for Kold? Lesson 1 > The Virgin Field > Step 2 Unlike some of the other interactive labs, this model has some randomness built in to reflect the real spread of a disease, which is a matter of probabilities. Despite this variability, you can get a sense for what effect each factor has on disease spread. Before running the simulator, predict whether the sick days per capita will be higher or lower with low population density. Record your prediction in the data table and then run the simulator to 100 days three times, recording the data each time. Make a prediction for high population density, record it in the data table, and run the simulator three times, recording that data in the table. Answer the following: What could be done to prevent the spread of disease in a low population density? What kinds of challenges would high population density present to these precautions? If contagion rate is calculated as the number of new cases per day per total population, what would the average contagion rate be for Kold? Lesson 2 > Vaccination > Step 1 In this lesson we'll look at "Impfluenza". You'll start by examining the disease's effects in a virgin field. First, compare the disease details (found in Simulation Parameters) of Impfluenza and Kold so that you know the differences between the two diseases. Based on these differences and what you know about Kold, predict the sick days per capita for Impfluenza at medium population and medium mixing. Record your prediction in your data table. In the simulator, select Lesson Vaccination, then set Countermeasure to None to provide the virgin field effect. Then run the simulator to 100 days three times. Answer the following: Was your prediction correct? If not, why not? Notice that Impfluenza, unlike Kold, has a death rate. How many people die, on average, when you run the simulator on the virgin field? How does a death toll change precautionary factors? What kinds of precautions might you take with Impfluenza that you might not have taken with Kold? Would you consider Impfluenza's death toll to warrant a "state of emergency"? How high would the numbers have to be for this to happen? Lesson 2 > Vaccination > Step 2 In this step we'll look at the effects of using a counter-measure by vaccinating a certain percentage of the population against Impfluenza. This represents a real-life scenario, where the country vaccinates a certain portion of its population against the expected influenza strains for that year. Change the tableau in the upper right corner of the simulator from Virgin to Vaccine. Predict and record the sick days per capita at medium population and medium mixing while the vaccine is in use. Run the simulator three times and record your data. Compare your results to the table in Lesson 2 Step 1. Then change the parameters to high population and high mixing with vaccine in use. Predict what will happen and run the simulator three times, recording your data for each run. Answer the following: For the first set of parameters (medium/medium), how does the vaccine reduce sick days? How large a percentage of the population would have to be immunized in order to bring the sick days per capita reliably below 0.1 per capita? How does using vaccination compare to changing the mixing or population density of the field? Lesson 3 > Counter-Virus > Step 1 What if we were to face an outbreak of a disease such as avian flu? In 1918-1919, the world experienced a pandemic unlike anything seen since the Black Plague of the mid-14th century in Europe. The Spanish Flu, or La Grippe, killed somewhere between 20 and 40 million people worldwide. In America alone, 28% of the population was infected with the virus, the vast majority of whom where between the ages of 20 and 40. There was no method in place at that time to deal with a pandemic with such a high contagion rate as well as a high death rate. The disease was new to the world in both form and function. In this lesson, imagine a new disease for which there is no vaccine and the death rate might be very high. Examine the details of Red Death and predict how many sick days per capita and the death toll of this new disease in low population and low mixing and record the prediction in your table. To see if you're correct, set the tableau to virgin, run the simulation three times, and record your data. What if you had a high population and high mixing? Record your prediction, change the population and mixing settings to high, and run the simulator three times. Record your data and compare with your prediction. Calculate contagion rate for each scenario (rural: low/low, urban: high/high). Would either of these scenarios be considered epidemic? Why or why not? What practical, precautionary measure would you suggest for each situation based on your calculated contagion rates? Lesson 3 > Counter-Virus > Step 2 Let's assume that there hasn't been time to develop and distribute a vaccine. However, we may not be dealing with an entirely virgin field. There may be a disease similar to Red Death which would provide immunity without a high death rate. (A situation like this occurred in the days of smallpox, when it was discovered that the similar but less lethal cow pox made people immune.) If we release this "reduced" virus into the population before Red Death comes along, some people will become sick and may even die from the reduced virus, but would the immunity provided make up for that? This final scenario may not be very realistic, as we don't fight diseases by releasing other diseases into a population. However, it does show how the different aspects of a disease (sick days, transmission rate, death rate, and immunity) interact. Change the tableau to countervirus. Choose one of the "C-Viruses" from the Countermeasure pull-down and review the features of that virus with its details button. Which of the three Countermeasure viruses (slow, medium, or fast) will do the best job in reducing the death toll in the population while also minimizing sick days per capita? Make a prediction based on everything you've learned about the effects of vaccination and disease transmission, record it, and then run the simulation three times for each of the C-Virus choices. Answer the following: Can you think of any environmental factors that might contribute to the spread of the disease? How would a counter-virus affect these environmental factors and/or the environmental factors affect it? Can counter-viruses be used to fight disease internationally or would they be most effective at a local level? What could health officials do to insure that the highest number of those at risk around the globe are receiving the most effective preventative health care possible? DATA TABLES: DISEASE LESSON 1 Lesson 1: Step 1Population NumberStarting Number of Contagious PeopleSick Days ReportedContagiousContagion RatePredictionxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSimulation Run 1Simulation Run 2Simulation Run 3 Lesson 1: Step 2Population NumberPopulation DensityStarting Number of Contagious PeopleSick Days ReportedContagiousContagion RatePrediction 1 (low)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSimulation Run 1Simulation Run 2Simulation Run 3Prediction 2 (high)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSimulation Run 1Simulation Run 2Simulation Run 3 DATA TABLES: DISEASE LESSON 2 Lesson 2: Step 1Population NumberPopulation DensityStarting Number of Contagious PeopleSick Days ReportedContagiousDeadPrediction (medium/medium)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSimulation Run 1Simulation Run 2Simulation Run 3 Lesson 2: Step 2Population MixingPopulation DensityStarting Number of Contagious PeoplePercentage of Population AffectedSick Days ReportedContagiousPrediction 1 (medium/medium)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSimulation Run 1Simulation Run 2Simulation Run 3Predication 2 (high/high)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSimulation Run 1Simulation Run 2Simulation Run 3 DATA TABLES: DISEASE LESSON 3 Lesson 3: Step 1Population MixingPopulation DensityPercent Vaccinated/ C-Virus UsedStarting Number of Contagious PeopleSick Days ReportedContagiousImmuneDeadPrediction 1 (low/low)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSimulation Run 1Simulation Run 2Simulation Run 3Prediction 2 (high/high)xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxSimulation Run 1Simulation Run 2Simulation Run 3 Lesson 3: Step 2Prediction: Slow Medium FastPopulation MixingPopulation DensityPercent Vaccinated/ C-Virus UsedStarting Number of Contagious PeoplePercentage of Population AffectedSick Days ReportedDeadSimulation Run 1 (slow)Simulation Run 2Simulation Run 3Simulation Run 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