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Description:Under a low magnification of 2X, this photograph depicted a number of Legionella pneumophila colonies that had been cultivated on Feeley-Gorman (FG) agar. Note the “cut-glass” appearance displayed by the round, off-white colored colonies. FG agar is used particularly in the cultivation of Legionella spp. bacteria, and is composed of casein (acid hydrolyzed), agar, beef extract, starch, cysteine and iron (III) pyrophosphate (Fe4(P2O7)3).
Who gets this disease?

People most at risk of getting sick from the bacteria are usually 65 years of age or older, as well as smokers, or those who have a chronic lung disease like emphysema.

People who have weak immune systems from diseases like cancer, diabetes, or kidney failure are also more likely to get sick from Legionella bacteria. People who take drugs to suppress (weaken) the immune system, such as after a transplant operation, or chemotherapy, are also at higher risk.

What should I do if I think I was exposed to Legionella bacteria?

Most people exposed to the bacteria do not become ill. If you have reason to believe you were exposed to the bacteria, talk to your doctor or local health department. Be sure to mention if you have traveled in the last two weeks.

High Resolution: Click here for hi-resolution image (18.34 MB)
Content Providers(s):CDC/ Dr. Jim Feeley
Creation Date:1977
Photo Credit:
Links:CDC - National Center for Immunization and Respiratory Diseases – Legionellosis
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.