Difference between revisions of "Mycoplasmas"

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#REDIRECT[[:Category:Mycoplasmas]]
 
 
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===Overview===
 
 
 
*Pathogens belong to the ''Mycoplasma'' and ''Ureaplasma'' genera
 
*Cause many diseases including contagious bovine pleuropneumonia
 
*Non-pathogenic mycoplasmas present in the rumen
 
*Live on mucous membranes of oronasal cavity, conjunctiva and intestines
 
*Usually host-specific
 
*Limited survival in the environment
 
 
 
 
 
====Characteristics===
 
 
 
*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
 
*''Ureaplasmas'' produce urease, whereas ''Mycoplasmas'' do not metabolise urea
 
*Serolgy is required for specific identification
 
*Growth inhibition tests using specific antisera can be used as well as fluorescent antibody tests
 
 
 
 
 
===Pathogenesis and pathogenicity===
 
 
 
*Mycoplasmas adhere to host cells and produce toxins
 
*Some adhere to neutrophils and macrophages and prevent phagocytosis
 
*Mycoplasmas induce proliferation of macrophages and monocytes, and release of cytokines such as TNF and interleukins
 
*Cause damage to cilia in the respiratory tract leading to pneumonia
 
 
 
===
 
 
 
 
 
 
 
*Cause [[Peritoneal Cavity Inflammatory - Pathology#In sheep|peritonitis in sheep]] and [[Peritoneal Cavity Inflammatory - Pathology#In goats|peritonitis in goats]] and [[Peritoneal Cavity Inflammatory - Pathology#In pigs|peritonitis in pigs]]
 
*Can be secondary to [[Respiratory Viral Infections - Pathology#In Cattle|IBR]]
 
*[[Respiratory Bacterial Infections - Pathology#Enzootic pneumonia of pigs|Enzootic pneumonia of pigs]] caused by ''M. hyopneumoniae'' and ''M. hyorhinis''
 
*[[Respiratory Bacterial Infections - Pathology#Contagious bovine pleuropneumonia (CBPP)|Contagious bovine pleuropneumonia]] caused by ''M. mycoides''
 
*''M. bovis'', ''M. dispar'' and ''Ureaplasma'' in [[Respiratory Bacterial Infections - Pathology#Enzootic pneumonia of calves|Enzootic pneumonia of calves]]
 
* May cause [[General Pathology - Chronic Inflammation#Lymphocytic Inflammation|lymphocytic chronic inflammation]] (peribronchiolar and perialveolar cuffing).
 
*''M. felis'' in mild [[Respiratory Bacterial Infections - Pathology#Mycoplasma felis|respiratory infection]]
 
*''M. ovipneumoniae'' in [[Respiratory Bacterial Infections - Pathology#Enzootic pneumonia of lambs|enzootic pneumonia of lambs]]
 
*''M. hyosynovia'' and ''M. hyorhinis'' produce syndrome similar to [[Haemophilus species|Glasser's disease]] with milder expression, menigitis rare, [[Joints Inflammatory - Pathology#In Pigs|arthritis]] most consistent
 
*In cattle [[Joints Inflammatory - Pathology#In Cattle|arthritis]]
 

Latest revision as of 11:17, 14 May 2010