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LEGIONELLALES —another order. 1)  Legionella —this entire genus was discovered fairly recently. They have probably been around  longer than humans, but we had never found them. In 1976 there was an outbreak of an unusual  pneumonia in persons who had attended a national convention of the American Legion. These  bacteria were eventually found to be the cause. The difficulty was that they will not grow on  normal lab media, but media which meet their requirements were developed and now several  species have been identified. In nature they live in water. Occasionally they colonize water lines,  air conditioning systems, produce misting systems, etc. and cause disease when they are inhaled.  2)  Coxiella –C. burnetii  causes a disease called Q fever. It was first grouped with the rickettsias,  but this one is different because it is not transmitted by insects. 
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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