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The ''[[Borrelia burgdorferi]]'' sensu lato complex is the cause of '''[[Lyme disease]]'''. The complex comprises three major species:

The ''[[Borrelia burgdorferi]]'' sensu lato complex is the cause of '''[[Lyme disease]]'''. The complex comprises three major species:

*''Borrelia burgdorferi'' sensu stricto, the most common cause of canine Lyme disease in the USA.

*''Borrelia burgdorferi'' sensu stricto, the most common cause of canine Lyme disease in the USA.

*''[[Borrelia garinii]]'' which, with ''B. afzelii'', is the most common cause of Lyme disease in Europe.

*''Borrelia garinii'' which, with ''B. afzelii'', is the most common cause of Lyme disease in Europe.

 

The ''Borreliae'' bacteria multiply in the blood stream of susceptible hosts and disseminate throughout the body. They can localise in joints, brain, nerves, eyes and heart.  

The ''Borreliae'' bacteria multiply in the blood stream of susceptible hosts and disseminate throughout the body. They can localise in joints, brain, nerves, eyes and heart.