Escherichia coli
Escherichia coli O157:H7 is a leading cause of foodborne illness. Based on a 1999 estimate, 73,000 cases of infection and 61 deaths occur in the United States each year.
CDC
7306_ lores.jpg (63 KB)
This thin section transmission electron micrograph (TEM) depicted a Gram-negative Legionella pneumophila bacterium, which was cultured in an embryonated hen's egg; Magnified approximately 119,500x.
At least 46 Legionella spp., and 70 serogroups have been identified. L. pneumophila, an ubiquitous aquatic bacterial organism, which thrives in warm environments, primarily at temperatures ranging from 32 degrees to 45 degrees C, and causes over 90 percent of Legionnaires' disease, (LD), in the United States. Legionnaires' disease, (LD), is the more severe form of legionellosis and is characterized by pneumonia, commencing 2-10 days after exposure. Pontiac fever is an acute-onset, flu-like, non-pneumonic illness, occuring within a few hours to two days of exposure.
Source: CDC
Link to hi-res version:
http://phil.cdc.gov/PHIL_Images/7306/7306.tif
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