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  • Janette Cicolini

    Borrelia burgdorferi is a spirochete, a class of long, slender bacteria that typically take on a coiled shape. Infection with this bacterium causes Lyme disease. Credit: Tina Carvalho, University of Hawaii at Manoa, NIGMS photo gallery

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Image of Streptococcus, a type (genus) of spherical bacteria that can colonize the throat and back of the mouth. Stroptococci often occur in pairs or in chains, as shown here. Tina Carvalho, University of Hawaii at Manoa

A colorized scanning electron micrograph of Mycobaterium tuberculosis, the bacteria that cause TB. Tuberculosis, commonly known as TB, is a contagious and an often severe airborne disease caused by a bacterial infection. TB typically affects the lungs, but it also may affect any other organ of the body. It is usually treated with a regimen of drugs taken for 6 months to 2 years, depending on the type of infection.

bacteria cell shapes - www.Rikes.Lr-Part... - PN 01867252 - Jahres-starter-Treffen 12.01.2014 in Schweinfurt mit Aloe Vera Papst (KAPILLAREN bestimmen unser Schicksal und KREBS wo ist dein Sieg?) (Fibromyalgie, Pilze, Pilzerkrankungen, Pilzinfektionen)

The bacterium, Enterococcus faecalis, which lives in the human gut, is just one type of microbe that will be studied as part of NIH's Human Microbiome Project. Credit: United States Department of Agriculture

bacteria, Mycobacterium buberculosis, young colony on a brain heart infusion; typical virulent strain

A human neutrophil interacting with Klebsiella pneumoniae (pink), a multidrug–resistant bacterium that causes severe hospital infections. Credit: NIAID

Francisella tularensis. Scanning electron micrograph of a murine macrophage infected with Francisella tularensis strain LVS. Macrophages were dry-fractured by touching the cell surface with cellophane tape after critical point drying to reveal intracellular bacteria. Bacteria (colorized in blue) are located either in the cytosol or within a membrane-bound vacuole. Credit: NIAID

Vibrio fischeri Bacteria are Gram-negative, flagellated, bioluminescent, curved rod-shaped marine prokaryotes. They live on decaying organic...

Staphylococcus aureus: USA:300 is a strain of gram-positive coccus bacteria responsible for Methicillin-resistant Staphylococcus aureus (MRSA), or Staph infection in humans. This strain of S. aureus is resistant to β-lactam antibiotics. When cultured, this bacteria appears as golden clusters. The golden color is the result of a carotenoid pigment that protects the bacteria against host-immune system reactive oxygen species, and adds to the bacteria's virulence.

Bacillus anthracis. Bacteria used as biological weapon: Anthrax. Oliver Meckes

Hartmannella vermiformis as it entraps a L. pneumophila bacterium. After it is ingested, L. pneumophila can survive as a symbiont within what then becomes its protozoan host. The amoeba becomes what is referred to as a ”Trojan horse”, by harboring the pathogenic bacteria, the amoeba can afford them protection, and, in times of adverse environmental conditions, are able to metamorphose into a cystic-stage enabling it, and its symbiotic resident pathogens to withstand environmental stresses.