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Host invasion by microorganisms (view source)
Revision as of 10:24, 22 August 2008
, 10:24, 22 August 2008→Prevention and control
The lifespan of bacteria differs from that of viruses in that it includes a '''colonization''' phase, which occurs on epithelial surfaces. As bacteria are capable of self-replication (i.e. they don't require host cellular machinery), this colonization phase allows them to develop a highly skilled and lethal army before invading the body. Once invasion occurs, spread can occur via the vascular or lymphatic systems. The pathogenesis of a particular strain of bacteria very much depends upon its location in the body: "''Streptococcus pneumoniae'' in the lung causes pneumonia...whereas in the blood it causes a rapidly fatal systemic illness, pneumoncoccal sepsis." (Murphy, et al, 43)
The lifespan of bacteria differs from that of viruses in that it includes a '''colonization''' phase, which occurs on epithelial surfaces. As bacteria are capable of self-replication (i.e. they don't require host cellular machinery), this colonization phase allows them to develop a highly skilled and lethal army before invading the body. Once invasion occurs, spread can occur via the vascular or lymphatic systems. The pathogenesis of a particular strain of bacteria very much depends upon its location in the body: "''Streptococcus pneumoniae'' in the lung causes pneumonia...whereas in the blood it causes a rapidly fatal systemic illness, pneumoncoccal sepsis." (Murphy, et al, 43)
==Prevention and control==
==Immunity to Bacteria==
*Bacterial evasion of immunity
*Bacterial evasion of immunity
**Bacterial capsules can avoid phagocytosis and complement activation
**Bacterial capsules can avoid phagocytosis and complement activation
Phagocytosis and digestion are the primary tools of the Immune System to conquering bacterial infection. These are enhanced by the production of [[Immunoglobulin G - WikiBlood|IgG]] and CD8+ Tcells, as well as by [[Complement - WikiBlood|complement]] activation.
Phagocytosis and digestion are the primary tools of the Immune System to conquering bacterial infection. These are enhanced by the production of [[Immunoglobulin G - WikiBlood|IgG]] and CD8+ Tcells, as well as by [[Complement - WikiBlood|complement]] activation.
*[[Innate Immune System - WikiBlood#Innate Immunity to Bacteria|Innate Immunity to Bacteria]]
*[[Innate Immune System - WikiBlood#Innate Immunity to Bacteria|Innate Immunity to Bacteria]]
==Prevention and control==
=[[Parasites - WikiBlood|Parasites]]=
=[[Parasites - WikiBlood|Parasites]]=