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Aspergillus flavus

Aspergillus flavus, green mold. Conidiophore (fruiting structure / sporangium) producing conidia (asexual conidia / spores). Magnification 220, scanning electron microscopy. Aspergillus flavus is a wide spread saprophyte found in soil, seeds, fruits and decaying vegetation. It is also found indoors on water damaged carpets and building materials. It is one of the Aspergillus species which causes aspergillosis, commonly in the tropics. Aspergillosis is a respiratory lung infection in people with weakened lungs or that are immune deficient (especially AIDS patients). This fungus produces aflatoxin, a group of virulent mycotoxins that are known animal carcinogens. These mycotoxins are can induce liver cancer in humans. The toxins may contaminate stored food (particularly carbohydrates). A. flavus has also been reported to be allergenic and its presence is associated with asthma. Courtesy of Dennis Kunkel.

Burkholderia pseudomallei

Burkholderia pseudomallei (also known as Pseudomonas pseudomallei). Gram-negative, aerobic, rod prokaryote. Magnification 2600, scanning electron microscopy. A zoonotic microorganism that causes melioidiosis. It is transmitted from infected rodents to humans through exposure to soil contaminated by rodent body wastes. Courtesy of Dennis Kunkel.

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