02/11/2023
Mycoplasma is a very challenging disease for backyard poultry owners and people who have breeding flocks because the only way to eliminate it with 100% certainty is via 1. culling or 2. testing and culling of breeding hens. Many responsible poultry owners get a diagnosis and then are confused on what they โshould do.โ This is in part due to the reality that Mycoplasma is considered somewhat ubiquitous in backyard flocks.
Hence, if you test your birds and they come back positive can you assume that all backyard poultry are already positive and therefore you are โOK going to a poultry show or selling your birds?โ From my perspective, although you went the extra mile testing, you still have one more step which is to not take sick birds to shows and to communicate your results with others who may be potentially affected.
In general, infections from Mycoplasma cause significant acute and chronic respiratory disease (i.e. coughing, sneezing, sinus infections, ocular and nasal discharge) and โsecondaryโ problems including swollen and infected joints in the hock and foot pad, skeletal deformities, weakness, poor laying and embryo mortalities.
While the clinical signs listed above are often seen in Mycoplasma positive poultry you canโt assume that if you see those signs that your birds have a Mycoplasma infection. This is because other infectious diseases have similar clinical signs in poultry include Infectious coryza, fowl cholera, Newcastle Disease, and Infectious Bronchitis.
In fact, the only way to know for sure what disease your birds may or may not have is via diagnostic testing. Diagnostic testing for Mycoplasma can be done while the birds are alive (i.e. ante-mortem testing) or once they are dead (i.e. post-mortem testing).
While infected birds can be treated with antibiotics by injection and/or in the feed, the treatment is not considered reliable in completely eliminating Mycoplasma but can be a potential option for an owner who does not want to cull infected carriers or flocks.
In addition, because the bacteria can be transmitted from the hen to the chick, if you have sick chicks you need to also test the breeding flock to confirm they are not infectious. In summary while Mycoplasma doesnโt kill a lot of birds, it is highly infectious and very common in backyard birds. Good biosecurity is a must if you hope to prevent it from affecting your flock.