Micro Lesson 4 New Infection and disease transmission

Micro Lesson 4 New Infection and disease transmission -...

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Lesson 4 Lesson 4 The Disease Process and The Disease Process and Disease Transmission Disease Transmission DEA 1135 DEA 1135 Introduction to Microbiology Introduction to Microbiology
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Larry, did you find that microbe yet?
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Principles of the Disease Process: Principles of the Disease Process: It is important that we understand that microorganisms are significant for  many reasons, but especially for the diseases that they can cause. Disease  is the result of the inability of the body’s defenses to fight off an  infection by a microorganism. If the infection is contained in a very small area, then it is a  local  infection. If the infections spreads and involves all or most of the body it is termed  systemic infection . Disease may be acute or chronic or both.  Acute  means that the disease process occurs fairly rapidly. (The  disease begins rapidly; progresses rapidly and recovery occurs rapidly). If the disease is prolonged; onset, duration or recovery, it is considered  chronic . A chronic disease may begin quickly but then not recover  quickly.
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Factors necessary for an infection to develop: Factors necessary for an infection to develop: For an infection to develop: 1. The microorganism must be able to get into the body 2.  It must be  stronger  than the host tissue and 3.  It must be able to  destroy  the host tissue. 
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Inflammatory process Inflammatory process Once the microorganism is inside the body, it begins to multiply and cause disease. The body often responds to the infection by way of the  inflammatory  process.  The symptoms of inflammation are:   swelling , redness,  heat , pain and  loss of function. These symptoms are designed to prevent the  propagation of the disease process.  If the body wins the battle against the invading pathogens, then the  infection is  stopped
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Transient vs. resident microorganisms Transient vs. resident microorganisms The type of a microorganism that comes from outside the  body to cause a disease process is called a  transient  microorganism.  It is the microbe that is normally not part of  the human body.  Under normal circumstances, the microorganisms present  in the body do not cause any disease. These  microorganisms are called  resident  microorganisms.  (i.e.  normal oral flora)
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The Disease Process: The Disease Process: The course of any disease can be divided into four main stages: 1 . Incubation 1. Prodromal 2. Acute 3. Resolution
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Incubation Incubation Incubation is the time period from the pathogens entry into the body until symptoms appear. (The microorganism is becoming established, growing and multiplying in this stage) Latent period is the time no signs or symptoms have become evident. The latent period during incubation may be short
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This note was uploaded on 08/19/2011 for the course DEA 1135 taught by Professor Guilford during the Spring '05 term at Gulf Coast Community College.

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Micro Lesson 4 New Infection and disease transmission -...

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