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'''''Need a quick disease diagnosis?''''' Call the Asia Pacific Centre for Animal Health on +61 3 9731 2275 for cost-effective '''[[Rapid tests for poultry diseases|rapid tests for a range of poultry diseases]]''', including Mycoplasmosis.<br><br>
'''Mycoplasmosis''' is a collective term for [[Types of disease#Infectious_diseases|infectious]] diseases caused by the micro-organisms called mycoplasmas. There are a number of mycoplasmas that can infect poultry, with the main ones being: ''Mycoplasma gallisepticum'' (MG), which affects a number of bird species including chickens, turkeys, gamebirds and pigeons; ''M. synoviae'' (MS), which affects chickens and turkeys; and, ''M. meleagridis'' (MM), which only affects turkeys. 

MG can cause chronic respiratory disease and decreased growth or egg production and affected carcases sent to slaughter may be downgraded. Some chickens may not show symptoms. Where signs occur these include rales, coughing, sneezing, nasal discharge, frothiness and swelling around the [[Nervous system and important sensory organs#Eyes|eyes]] or difficulty breathing. Signs are often more severe in turkeys. MS can cause respiratory disease similar to MG but if it becomes systemic can cause lameness, swollen joints, loss of weight and breast blisters. Greenish diarrhoea can also be present in dying birds. MM is a venereal disease that can result in high mortality of young poults through starvation. Signs in young poults include unthriftiness, difficulty breathing, poor growth and neck and leg deformations. Breeder flocks may experience a drop in egg production and hatchability. 

=== What causes mycoplasmosis?  ===

All of these mycoplasmas can be transmitted vertically and so can be introduced into the flock through infected eggs, including venereal transmission by males for MM. Vertical transmission has been greatly reduced through the establishment and maintenance of MG, MS and MM-free breeder flocks. They can spread through bird-to-bird contact and contact with exhaled respiratory droplets either as aerosols or on equipment, people and surroundings. Birds recovered from MG and MM remain shedders of the organisms. 

=== Treatment and prevention of mycoplasmosis  ===

All of these mycoplasmas are sensitive to several antibiotics, however [[Immune system#Vaccines_and_the_immune_response_to_vaccination|vaccines]] for some mycoplasmas are also available. Good [[Disease prevention#Biosecurity|biosecurity]] procedures are critical for prevention. Mycoplasmas are destroyed by disinfectants and sunlight. Eradication is the best prevention method. 

== Further information  ==

*Poultry Health Handbook 4th Ed, 1994. L. D. Schwartz, Pennsylvania State University.

== See also  ==

*[[List of avian diseases]] 
*[[Types of disease]] 
*[[Disease prevention]] 
*[[Immune system]] 
*[[Rapid tests for poultry diseases|Rapid tests for poultry diseases]]

== External links  ==

*[http://www.merckvetmanual.com/mvm/index.jsp ''The Merck Veterinary Manual''] has a section dedicated to '''Poultry''' 
*[http://www.thepoultrysite.com/diseaseinfo/ ThePoultrySite.com's ''Poultry Disease Guide's''] quick search tool allows easy access to a wealth of information concerning poultry disease and health.

[[Category:Bird_health_and_disease]]