ead the following scenario and answer the corresponding questions to the best of your ability. For equation questions, please show your work. For multiple choice or true/false questions, please choose the best answer. For short-answer questions, please do your best to answer all parts of the question, but also consider the length of your answer and try to be brief. Be sure to check your work, and show evidence for your answers when necessary. Please FOLLOW THE BEST RUBRIC.Grading Rubric for Case StudiesIHP 330 Principles of Epidemiology
This rubric is adopted from the Association of American Colleges and Universities LEAP Initiative
Strategy: Review the Case Study Guidelinesdocument for preparing and writing your report.
Purpose: Demonstrate an ability to synthesize course material, knowledge, expertise with new information and draw meaningful conclusions.
Benchmark indicates the minimal expectations. This assignment has 5 critical elements worth up to 2 points each, for a total of 10 points.
Critical Elements Proficient
1.6 Below Benchmark
Explanation of Issues Issue/problem/questionsare considered critically and addressed clearly and described comprehensively, delivering all relevant information to answer stated questions. Issue/problem/questionsare considered critically,answered, and clarified so that understanding is not seriously impeded by omissions. Issue/problem/questions are considered critically, answer is stated, but description leaves some terms undefined, ambiguities unexplored, boundaries undetermined, and/or backgrounds unknown. Issue/problem/questionsto be answered critically are stated without clarification or description.
Selecting and using information to investigate a point of view or conclusion Information is given/taken from the case with enough interpretation/evaluation to develop a comprehensive analysis or synthesis of expert viewpoints with logical conclusion of evidence.
Information is given/taken from the case with enough interpretation/evaluation to develop a coherent analysis or synthesis.Viewpoints of experts are analyzed and questioned, leading to a conclusion of the evidence.
Information is given/taken from cases with some interpretation/evaluation, but not enough to develop a coherent analysis or synthesis. Viewpoints of experts are taken as mostly fact, with little questioning and no conclusions. Information is given/taken from cases without any interpretation/evaluation.
Limited sources from peer-reviewed journals.Viewpoints of experts are taken as fact, without question or synthesis of conclusions.
Influence of Context and Assumptions Thoroughly (systematically and methodically) analyzes own (if applicable) and others’ assumptions and carefully evaluates the relevance of contexts when presenting a position. Is mindful of the contextual principles of the specific discipline for which the student is enrolled,applies cultural considerations in case analysis. Identifies own and others’ assumptions and several relevant contexts when presenting a position. Is mindful of other’s assumptions and considers cultural considerations in understanding and analyzing cases. Questions some assumptions. Identifies several relevant contexts when presenting a position. May be more aware of others’ than of own assumptions (or vice versa).Shows awareness of cultural considerations in analysis of case. May make assumptions about contexts, without identifying influence on position.Awareness of the cultural influences of the case is not evident.
Writing Mechanics/Style Flow of Syntax is effective paragraph-to-paragraph and sentence-to-sentence.
Paper is well organized with a compelling introduction, well-developed body with analysis, and conclusion where applicable.
Few syntactical errors that do not affect clarity.
Paper is well-organized and has a strong introduction, body, analysis, and conclusion where applicable.
Flow of syntax may be choppy, with slight distraction of readability.
Paper is organized and has an introduction, body, and a conclusion where applicable. Several syntax errors that distract from readability.
Paper has an elementary organization with introduction, body, and conclusion.
APA Formatting and Citation Demonstrates greater than 95% compliance with APA format and spelling and grammar rules. Attribution is well documented, indicates synthesis of several authors.Report is within page-length criteria. Demonstrates 85%-95% compliance with APA format and spelling and grammar rules. Appropriately and accurately paraphrases and summarizes sources without distorting original meaning.Report is within page-length criteria. Demonstrates 80-85% compliance with APA format and spelling and grammar rules. Distinguishes between common knowledge and information requiring attribution.Report is within page-length criteria. Demonstrates less than 80% compliance with APA format and spelling and grammar rules. Ineffective attribution; may have 20% or more direct quotations, might not distinguish common knowledge from information requiring attribution.Report is less than 2 or more than 4 pages of writing.
Title: Descriptive Epidemiology and West Nile Virus
• Follow and comprehend a scenario using epidemiologic principles.
• Identify and describe key descriptive epidemiology indicators such as person, place, and time.
• Describe some patterns of disease according to person, place, and time.
• Create graphs or tables as appropriate to further describe disease information.
Assignment (10 points)
Read the following scenario and answer the corresponding questions to the best of your ability. For equation questions, please show your work. For multiple choice or true/false questions, please choose the best answer. For short-answer questions, please do your best to answer all parts of the question, but alsoconsider the length of your answerand try to be brief. Be sure to check your work, and show evidence for your answers when necessary.
West Nile virus (WNV) is a vector-borne disease (zoonotic arbovirus, Flavivirus), transmitted by WNV infected mosquitoes (Mayo Clinic, 2012). These mosquitoes become infected when they feed on infected animals—most likely birds—and then transmit the infection to humans or animals (CDC, 2012). West Nile virus is endemic to East Africa, particularly the Western Nile region of Uganda, but was first identified in the United States in 1999 in Queens, New York. West Nile Virus is often found in ecosystems where mosquitoes thrive and breed (low to medium altitudes, access to water and standing water, tropical/temperate/seasonal climates, dense brush to some flora).
West Nile virus can present symptoms such as fever, headaches, fatigue, muscle pain, aches, malaise, nausea, anorexia, vomiting, myalgias and rash—although about 80% of cases will not show any detectable symptoms at all—and less than 1% of cases will result in severe neurological disease, affecting the central nervous system with inflammation of the brain (encephalitis or meningitis). People with compromised immune systems are more likely to develop a more severe or symptomatic version of the disease.Symptoms can develop after an incubation period of 2 to 15 days from the time of infection (CDC, 2012).
In 2012, the United States experienced 5,674 confirmed cases and 286 deaths—a mortality rate of 5% of reported cases. Of the 5,674 cases, 2,873 had neuroinvasive disease from West Nile (presumably the 50% rate of neuroinvasive disease was so high because of under-reporting of asymptomatic WNV).
In the state of Texas in 2012, there were 1,700 confirmed and probable cases of WNV, and 89 deaths. There were 780 neuroinvasive disease cases.
This is a table of the confirmed cases from the Texas Department of State Health Services.
(Texas DSHS, 2013)
Question 1 (1 point):From the above table, please identify the person data provided as a major indicator (as described in the descriptive epidemiology readings and lecture). Review the person data in the table and make an assertion about who is being affected the most by or the most at risk for developing WNV and WNV Fever vs. WNV neuroinvasive disease.
The following maps show West Nile Summary of activity by counties within Texas, West Nile Fever presence in Texan counties, and West Nile neuroinvasivedisease presence within Texan counties respectively (Texas DSHS, 2013).
Question 2 (1 point):From the above graphs, please identify the place data provided as a major indicator (as described in the descriptive epidemiology readings and lecture). Review the place data in the graphs and make an assertion about which areas are being affected the most by or the most at risk for developing WNV and WNV Fever vs. WNV neuroinvasive disease and which areas are not being affected. If you know anything about the general geography or topography of Texas, please include this (e.g. altitude, desert, woods, swamp, climate) and the interaction place would have on the vector (mosquitoes).
(Texas DSHS, 2013)
Question 3 (1 point):From the above graph, please identify the time data provided as a major indicator (as described in the descriptive epidemiology readings and lecture). Review the time data in the graph and make an assertion about whenpeople are being affected the most by or the most at risk for developing WNV and when they are not being affected as much.
Question 4 (1 point):
As you have seen so far, epidemiologists generally collect a lot of information about cases and suspected cases. From the following list of demographic person/place/time indicators, please list the five indicators you believe to be most important when discussing risk from WNV. For each of the indicators you choose, please give a sentence or two justifying why it is important to collect such data concerning WNV.
Seasons Climate Age
Neighborhood Gender Birthplace
Months Rural/Urban Annual income
Recent travel Leisure activities Weeks
Race Occupation Country
Time of day School district Marital status
Question 5 (1 point):Draw a table from the following information:
• United States
• Suspected Human WNV Cases: 25
• CDC Statistics, Surveillance, and Control, 2011
• Confirmed Human WNV Fever Cases: 322
• Encephalitis/Meningitis WNV Cases: 373
• Year 2009
• Confirmed Human WNV Deaths: 32
Be sure to review and include the characteristics of a good table.
Question 6 (1 point):Interpret the table you drew above into words.
Question 7 (1 point):
Draw a graph from the following information:
• CDC, Disease Maps 2013
• Number of States with Human WNV, confirmed
o 2010: 41
o 2011: 44
o 2012: 50
• Number of States with Mosquito WNV, confirmed
o 2010: 43
o 2011: 38
o 2012: 50
• Number of States with Bird WNV, confirmed
o 2010: 20
o 2011: 18
o 2012: 28
Be sure to review and include the characteristics of a good graph.
Question 8 (1 point):Interpret the graph you drew above into words.
Question 9 (2 points):Vaccines for WNV are not yet available, but epidemiologists have been gathering information on the spread of WNV via surveillance from CDC called ArboNet. This information should hopefully lead to more concrete guidelines on how to prevent contracting the disease and lessen itsimpact of it on victims. Synthesize the information you know from this case study to write five recommendations for the public to follow to prevent contracting WNV or lessen the morbidity of WNV cases. You can use the information you know about risk factors and determinants to help guide your recommendations.
CDC (2012, August 2). West Nile Virus Factsheet. The Centers for Disease Control and Prevention, (online) retrieved from http://www.cdc.gov/ncidod/dvbid/westnile/wnv_factSheet.htm, Accessed 14 May 2013.
Mayo Clinic (2012, December 18). West Nile Virus definition. Mayo Clinic, (online) retrieved from http://www.mayoclinic.com/health/west-nile-virus/DS00438, Accessed 14 May 2013.
Texas DSHS (2013, May 17). Statistics for West Nile Virus in Texas. Texas Department of State Health Services, (online) retrieved from http://www.dshs.state.tx.us/idcu/disease/arboviral/westnile/statistics/, Accessed 20 May 2013.