Cocci type bacteria have been associated with a variety of human infections
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Need help with Gram-negative cocci?

I am working on a biology project where my colleagues and I are epidemiologists and we need to solve a scénario.Alors is a problem I have: If a man called Mr. Berg, who works in a museum. It was a Western Prairie Dog Diorama, when he suddenly became ill with a “mysterious disease”. What happened was that he was given a dead dog, the prairie from a local pet store has been filled. The prairie dog was killed by a pet cat, pet store owner was. The cat was tested in order to perfect on all fronts, and all that, but he had a presence puces.Mon team came to the conclusion that Mr. Berg was the plague of fleas, which was still on infected prairie dogs. A tissue sample tested lymphoid tissue that has Herrenberg the presence of cocci Gram négatif.Le problem reveals that there is another prairie dog to the pet, which sells the university was because they needed a new prairie dog as a mascot. The school eventually had many cases of deaths from bubonic or pneumonic plague. However, all victims of the College had the presence of Gram-negative coccobacilles.Donc is my question: What is the difference between gram-negative cocci and gram negative bacteria? If cocci Gram-negative result of the bubonic plague bacillus and gram-negative result of pneumonic plague (We have assumed that the bubonic plague had finally turned into pheumonic so many victims in the school respiratory failure and fluid in the lungs, as well as fever, chills, fatigue .


1 Comment to Need help with Gram-negative cocci?

  1. jowan_jxl's Gravatar jowan_jxl
    January 11, 2010 at 1:11 pm | Permalink

    the difference between a coccobacillus and a coccus is its shape. cocci are round like balls. bacilli are rod shaped. coccobacilli are bacilli that are shorter and rounder than rods, but are not cocci. gram negative relates to how they stain with gram dyes. gram negative do not take up the stain, hence negative.

    bubonic and pneumonic plague are both caused by yersinia pestis, a gram negative coccobacillus. the difference between them is not the bacterium but the way it enters the body. bubonic is via the lymph eg breach of skin, but pneumonic is by inhalation.

    its not necessarily accurate to assume bubonic and pneumonic are interchangeable- fever, chills and fatigue will be present in a lot of infections. fluid in the lungs (pleurisy) is the guiding symptom to differentially diagnose pneumonic.

    its possible these two outbreaks may have been caused by different bacteria altogether.

    your conclusion about the college (plague) is right, but not with mr berg. there is a gram negative coccus that could have caused mr bergs illness- which is unlikely to have come from the dog or cat (or fleas), and which is unrelated to yersinia.

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