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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.
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.
This is a scanning electron micrograph of Plasmodium gallinaceum, which causes malaria in poultry, invading the midgut of the Aedes aegypti mosquito. Credit: NIAID "Fighting Drug-Resistant Malaria" Rick Fairhurst and Others at NIAID Go Global By Kristofor Langlais, NICHD, for the NIH Catalyst (www.niaid.nih.gov...)
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.