Modeling HIV/Aids

Great Essays
Review of the mathematical paper

Introduction

The article that is reviewed today is “An introduction to mathematics of HIV/Aids modelling” by Leigh Johnson published in 2004 for Centre of Actuarial Research for University of Cape Town, South Africa.
The article provides an introduction to modelling HIV/Aids transmission as well as survival and focuses on children who lost their parents due to HIV/Aids called orphans. The lack of proper Introduction to the article isn’t easily allowing the reader to understand the purpose of the paper. Reading the first section of the paper, called “Epidemiological Terminology” one is presented with variety of scientific definitions such us Prevalence or Incidence of a disease, hence the very first interpretation
…show more content…
Alongside referencing other work through the paper, very often Johnson is sending the reader to the source if one wanted to find out more information for a given topic. Example of such situation is at the end of section “Improving the modelling of HIV transmission” where Johnson is finishing the section with a reference to Garnett and Bowden paper for further information. The main work that Johnson is building his conclusions on is The ASSA 2000 Suite of models. He mentions it at the beginning of section 4, “Improving the modelling of HIV transmission”.
On top of the publications made by others, Johnson is using statistical distributions and mathematical formulae in the paper, and he does that without much explanation, suggesting that the audience for the paper are mathematicians or bio-mathematicians who want to expand their knowledge in the
…show more content…
Notation seems to be ambiguous, especially with the dot “.”It is not clear what the author meant, although it can be clarified that it is multiplication sign. The entire model looks like it may work, but again the author doesn’t give any specific methods of arriving at the results, nor references, making the reader believe him “on word”. Similar, yet little more complex model is found at Hyman & Stanley,1988 with the equation for the rate of change of infected individuals being the same in both papers. Although it may be assumed that the author was inspired by Hyman’s and Stanley’s paper it is not given anywhere what was the inspiration, what obviously doesn’t give the author much credibility. What author fails to mention, although he might not think it is important, essentially those are Lotka-Volterra (Sternberg, 2009).
Later, author defines a new term, namely “basic reproductive number, R_0 and explains how this number is used in the field of contagious diseases. Importantly the author provides a valid reference. The way in which author calculates the R_0 is correct however somewhat informal, and not clear. More detailed information on the number is found in Jones,

Related Documents

  • Improved Essays

    Fixing a Problem: AIDS The book Nine Hills to Nambonkaha covers a number of different elements that are present in Africa. It teaches the reader of what life is like in Ivory Coast; it portrays a picture far different than what we are used to as Americans. The book speaks of a resilient village called Nambonkaha; things are good in Nambonkaha, but certainly not perfect.…

    • 889 Words
    • 4 Pages
    Improved Essays
  • Improved Essays

    Conquest By Law Analysis

    • 1778 Words
    • 8 Pages

    Lindsay G. Robertson's Conquest by Law: How the Discovery of America Dispossessed Indigenous Peoples of Their Lands centers on the landmark 1823 Supreme Court case Johnson vs. M'Intosh. Robertson's research provides previously undiscovered knowledge of the circumstances surrounding the case, placing the case in a new context. Robertson tells the story of a costly mistake, one made by the American judicial system but paid for by indigenous people who to this day suffer from the effects of American settlement. As reviewer Christopher Tomlin writes, "Robertson's narrative is far less concerned with parsing its legal doctrine, than with the historical circumstances of the case itself." Robertson begins his story in the middle of the 18th century,…

    • 1778 Words
    • 8 Pages
    Improved Essays
  • Improved Essays

    In the article by Karen McVeigh entitled “US Military Veterans Face Inadequate Care after Returning from War”, the author talks about the difficulties that many veterans face on their way home. McVeigh goes on to talk about how the US Department of Defense has not been the best at giving the veterans the needs that they deserve. They have been found to being slow when it comes to that aspect of things. Throughout the article, the author talks about how more things need to be done in order to keep achieving a functional VA and Department of Defense.…

    • 494 Words
    • 2 Pages
    Improved Essays
  • Improved Essays

    Johnson fits the context which it is written in because the formal tone it has makes the court seem more authorial as if their decision was the best. The formal tone makes the court sound smarter and like their decision is strong which helps because it makes their argument sound better and the better choice. The informal Tone of American Flag Stands for Tolerance is appropriate for his writing because he wrote a newspaper editorial about his opinion using things such as historical moments and colloquialism to draw readers in and he uses in depth things such as how people are treated in China if they were to do something like that in their country to support his statement that the flag stands for tolerance. That is why the tones for each story are appropriate for the context of their writings.…

    • 543 Words
    • 3 Pages
    Improved Essays
  • Superior Essays

    It really went into detail, explaining all of the things Lyndon did and thought about. Not only did it talk about the things that everyone knew about Johnson, but it also talked about things that he did which were very important but sometimes forgotten about. I thought that it was really amazing that he went from being in a leader position at his college to being the leader of the country. Another thing I never knew but learned throughout the book was that he was always being underestimated. This is one thing that the author did a great job of explaining and showing.…

    • 1728 Words
    • 7 Pages
    Superior Essays
  • Decent Essays

    In the article “AIDS in Africa” by Alison Katz, a widely known member of the People’s Health Movement, there is a clear line between what many people think the root problems of AIDS/HIV are and what Katz believes. She makes many strong statements about this and makes her argument very well understood by the audience. She also gives light to why the masses ideas on AIDS/HIV are wrong. There are many comments made by Katz which tell the reader that the majority of people’s ideas about AIDS/HIV are wrong. She states that they think that AIDS/HIV is spread because African people are promiscuous and overall bad people.…

    • 446 Words
    • 2 Pages
    Decent Essays
  • Improved Essays

    How Poison Frogs Avoid Poisoning Themselves In Abby Olena’s article “How Poison Frogs Avoid Poisoning Themselves” is an article explaining the studies and the findings of biologist that have found about poisonous frogs. Abby Olena specifically talks about an evolutionary biologist, named Rebecca Tarvin, and some of her colleagues that are researching how poisonous frogs can avoid poisoning themselves. A few points the article makes are how they become poisonous, the evolution of the amino acid sequence, and the understanding of consequences from evolving. This article begins by explaining how frogs become poisonous.…

    • 1041 Words
    • 5 Pages
    Improved Essays
  • Superior Essays

    He says that her request is just a desire, a want, and is a request that does not abide to the general rules of society. He goes on in his complex sentence to state that her request is not proper, not made with reason, and does not follow common occurrences in life that should be changed, but rather, is being forced to change, through the woman’s request. In the end, by using complex syntax in his letter, Johnson is able to craft his denial effectively by comparing how the woman made her request, which is improper and unorthodox, to how society’s requests should be made, which is proper, sophisticated, and pondered…

    • 1574 Words
    • 7 Pages
    Superior Essays
  • Improved Essays

    In between these phrases, he mentions political issues that need to be passed through congress quickly. Johnson uses the past president's death as a way to make the American people believe that they need to pass these laws. By using this contrast at the end, Johnson truly uplifts and motivates the audience. He also alludes to the previous work he had done with the civil rights movement. Once again using credibility, instead of emotion, to persuade his audience.…

    • 870 Words
    • 4 Pages
    Improved Essays
  • Improved Essays

    tolerate my "slacking off" in his emergency room. Telling Johnson my reluctance to ghostwrite a journal article for him shouldn't be misinterpreted as "slacking off," I walked away, and went looking for an emergency to handle. For the most part, Johnson left me alone during the rotation and interacted with me only on rare occasion. One day, however, a number of residents were out sick, and Johnson was forced to serve as a back-up physician for a few hours.…

    • 1763 Words
    • 8 Pages
    Improved Essays
  • Improved Essays

    Johnson starts by letting the reader know that he is responding to Thomas Friedman. He refers indirectly to the article by Friedman. For example, he narrate how Friedman wrote about…

    • 768 Words
    • 4 Pages
    Improved Essays
  • Superior Essays

    To me this story reflects his intentions to help American citizens who have been oppressed due to poverty or discrimination or any other hardship. I think that it also displays some guilt that he might have about weakening a previous Civil Rights act. This story could also aid Johnson in his use of pathos by creating a sense of responsibility and feelings of guilt among the American people for having allowed such acts of…

    • 1741 Words
    • 7 Pages
    Superior Essays
  • Improved Essays

    On page 339 Johnson states that “integration is then, in principle, a calling from God”. In your own words explain what he means by this phrase. In its purest form the integration of Christianity and modern psychology is a “calling from God” (Johnson, 2011). It is accepted and believed within the integration perspective that all truth and knowledge comes from God; whether this knowledge is obtained through the Bible or discoveries made in natural science, mathematics, philosophy, and etc.…

    • 1293 Words
    • 5 Pages
    Improved Essays
  • Superior Essays

    'Acquired Immune Deficiency Virus (AIDS) is caused by a human immunodeficiency virus (HIV) that weakens the immune system , making the body susceptible to and unable to recover from op­portunistic diseases that lead to death' (USAID, 2010, pp.173). It is one of the major challenges for Pub­lic Health and it is the world's leading infectious killer. According to the WHO, 35 million people are living with HIV worldwide. In middle and low income countries is the majority of infec­ted people. In 2013, 2.1 million new infections occurred in low and middle income countries (WHO, 2013).…

    • 2493 Words
    • 10 Pages
    Superior Essays
  • Improved Essays

    "If you knew I was HIV positive would you still treat me as an equal, would you still be my friend, would you still touch me, would you still love me?” These are some of the thoughts that go through the minds of the millions of people worldwide who are currently living with HIV/AIDS. Despite the mass impact of the disease, many still remain ignorant to its definition, history, and effects, leading to the negative associations of those affected. I’m here to give you a brief enlightenment of HIV/AIDS in an effort to to lessen the misconceptions and stigma of HIV/ AIDS. First, we need to understand the basics.…

    • 1048 Words
    • 4 Pages
    Improved Essays