Difference between revisions of "Category:Mycoplasmas"

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|pagebody =The Mycoplasmas are small free-living prokaryotic organisms. They cause many diseases, notably respiratory diseases in farm animals including [[Contagious Bovine Pleuropneumonia]]. 
 
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<categorytree mode=pages>Mycoplasmas</categorytree>
 
<categorytree mode=pages>Mycoplasmas</categorytree>
 
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===Overview===
 
  
*Pathogens belong to the ''Mycoplasma'' and ''Ureaplasma'' genera
 
*Cause many diseases especially respiratory diseases of farm animals including contagious bovine pleuropneumonia
 
*Can be involved in mastitis and conjunctivitis in cattle
 
*Implicated in respiratory and urinary tract diseases in dogs and cats
 
*Non-pathogenic mycoplasmas present in the rumen
 
*Live on mucous membranes of oronasal cavity, conjunctiva and intestines
 
*Stress factors and concurrent disease may predispose to tissue invasion
 
*Usually host-specific
 
*Limited survival in the environment
 
  
===Characteristics===
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[[Category:Bacterial Organisms]]
 
 
*Smallest free-living prokaryotic organism
 
*Pleomorphic organisms
 
*Have no peptidoglycan cell wall
 
*Susceptible to dessication, heat and disinfectants
 
*Require enriched media containing animal protein, sterol and a source of DNA for growth
 
*Colonies have a fried egg appearance
 
*Most are facultative anaerobes
 
 
 
===Pathogenesis and pathogenicity===
 
 
 
*Mycoplasmas adhere to host cells and produce toxins
 
*Some adhere to [[Neutrophils - WikiBlood|neutrophils]] and macrophages and prevent phagocytosis
 
*Mycoplasmas induce proliferation of macrophages and [[[[Monocytes - WikiBlood|monocytes]]]], and release of cytokines such as TNF and interleukins
 
*Cause damage to cilia in the respiratory tract leading to pneumonia
 
*Molecular mimicry allows some mycoplasmas to avoid the host immune response and may initiate immune-mediated disease
 
 
 
===Diagnosis===
 
 
 
*Samples can be tested for the presence of mycoplasmas by fluorescent antibody techniques, peroxidase techniques and PCR
 
*Biochemical profiles such as urease production can be used for identification
 
*''Ureaplasmas'' produce urease, whereas ''Mycoplasmas'' do not metabolise urea
 
*Serolgy is required for specific identification including complement fixation tests, ELISA, agglutination tests and haemagglutination-inhibition tests
 
*Growth inhibition tests using specific antisera can be used as well as fluorescent antibody tests
 
 
 
===Other mycoplasmas===
 
 
 
*''M. bovis'', ''M. dispar'' and ''Ureaplasma'' can be involved in [[Respiratory Bacterial Infections - Pathology#Enzootic pneumonia of calves|Enzootic pneumonia of calves]]
 
*''M. ovipneumoniae'' is implicated in [[Respiratory Bacterial Infections - Pathology#Enzootic pneumonia of lambs|enzootic pneumonia of lambs]]
 
*''M. felis'' may be involved in mild [[Respiratory Bacterial Infections - Pathology#Mycoplasma felis|respiratory infection]]
 
*Mycoplasmas may cause [[Chronic Inflammation - Pathology#Lymphocytic Inflammation|lymphocytic chronic inflammation]] (peribronchiolar and perialveolar cuffing)
 
*Cause [[Peritoneal Cavity Inflammatory - Pathology#In sheep|peritonitis in sheep]], [[Peritoneal Cavity Inflammatory - Pathology#In goats|peritonitis in goats]] and [[Peritoneal Cavity Inflammatory - Pathology#In pigs|peritonitis in pigs]]
 
[[Category:Bacteria]]
 

Latest revision as of 21:31, 5 November 2010