Discussion 2 – Concepts of Infectious Disease Topic/Inst


Discussion 2 – Concepts of Infectious Disease Topic/Instructions Read Chapter 2 first. Then come to this discussion. I have set the discussion up around the general topic of Concepts of infectious disease. Since the chapter in the textbook is so full of important concepts it would be difficult to narrow it down to a single topic for discussion. So I have posted this introduction and 5 separate subtopics. Each student should choose one of these subtopics for your major post. Take an active role in presenting this topic to the other students. Explain the concept in your own words or develop it further using a relevant example.You should then read the comments of other students in the other subtopics and respond to at least one in every subtopic that has a primary comment in it. That allows you to develop one subtopic in an active sense but learn about the others by being drawn into them through other people’s posts. You should write well thought out primary comments on at least one of the points below (150-200 words). Then you should make well thought-out comments to your classmates’ comments at least one in every subtopic that is being developed. Subtopic 1: Factors that affect the spread of epidemics – Part 1 : Explain the following statement: Epidemiology is the Study of the relationship between an infectious agent and its host population A balanced host/parasite relationship must exist: The virus can deplete host but if virus completely eliminates the host it will become extinct. Subtopic 2: Factors that affect the spread of epidemics – Part 2 : Explain how the interaction between these factors are relevant to the transmission of AIDS. For example which of these factors are most critical to the transmission of HIV. Which aren’t. 1. Total number of hosts 2. Hosts birth rate 3. Rate at which new susceptible hosts migrate into population 4. Number of susceptible uninfected hosts 5. Rate at which disease can be transmitted from infected to uninfected hosts 6. Death rate of infected hosts 7. The number of infected hosts who survive and become immune or resistant to further infection Subtopic 3: Acute versus Chronic Infections : Compare the definitions of Acute Infections and Chronic Infections below. Based on what you know about HIV/AIDS at this point which description most closely matches AIDS? Explain your answer using evidence from the book to support your position. What is an acute infection? 1. Produces symptoms and makes a person infectious soon after infection. 2. The infected person may: transmit the disease die from the infection recover and develop immunity 3. the acute microorganism STRIKES QUICKLY infects entire group (small group) dies out What is a chronic infection? Person may never show symptoms Person continues to carry infectious agent at a low level Does NOT mount an effective immune response Subtopic 4: Controlling infectious disease : Explain what herd immunity is and how it works. Use an example from either the book or the internet to explain your position. Herd immunity = when all or nearly all susceptibles are immunized no new infection can occur. Agent can be eradicated from the population. Subtopic 5: Modern concepts of Infectious Disease and Koch’s Postulates From the Oxford Dictionary: Definition: postulate verb |psCHlt| [ with obj. ] 1 suggest or assume the existence fact or truth of (something) as a basis for reasoning discussion or belief: his theory postulated a rotatory movement for hurricanes | [ with clause ] : he postulated that the environmentalists might have a case. a thing suggested or assumed as true as the basis for reasoning discussion or belief: perhaps the postulate of Babylonian influence on Greek astronomy is incorrect. Robert Koch was a physician/scientist in the 1800s who studied the transmission of infectious disease. He proposed 4 postulates also known as Koch’s Postulates (p. 12-13) help control the spread of infectious disease. He proposed that a microorganism can be considered to be a disease if it fulfills certain criteria or conditions. These are listed on p. 12 in the textbook. The book also goes on to describe how these postulates helped to prevent the spread of the plague pandemic in the late 1800s. : Using what you learned from the movie And the Band Played On described the ways that Koch’s postulates helped scientists to identify what was going on with this new acquired immune deficiency syndrome (AIDS) and to help it from exploding completely out of control. Module 2 Reflection In each module we’ll have a final discussion to reflect on what we learned this week. Here you can post commentary on something that we discussed how a concept would apply to a particular situation etc. For Week 2 why don’t you each just tell me a new insight that you learned about infectious disease. You can make multiple posts if you’d like or pose s for additional discussions. be creative. Everyone should make at least one meaningful comment and that should be at least 100 words.


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