STRUCTURE AND PHYSIOLOGY Aspergillus versicolor is a slow-growing filamentous fungus found in damp indoor environments and on food products. Colonies can vary greatly in color, starting as white and changing to yellow, orange, and green with pink or flesh hues intermixed as they mature. A. versicolor can grow in very...
STRUCTURE AND PHYSIOLOGY Mucor circinelloides is a fungus commonly found in soil and food. M. circinelloides is described to exhibit dimorphism as it is found to grow in either filamentous mycelia or multipolar budding yeasts, depending on its environment. This microorganism reproduces asexually using sporangiophores and thrives in cooler temperatures. TRANSMISSION...
STRUCTURE AND PHYSIOLOGY A. pullulans is a black-yeast-like mold that can express many varying morphologies based on growth conditions. Prior to the formation of spores, the mold appears smooth and yellowish, creamy, or light pink. Asexual, melanated spores are eventually formed which gives it a characteristic black color. This fungus...
STRUCTURE AND PHYSIOLOGY R. aquaspersa is a black yeast-like fungus that is commonly found as a conidiophore, or a sexual spore generating aerobic fungus. This fungus is closely related to other members of the order Chaetothyriales that are associated with opportunistic infections. It is more prevalent in hot, arid portions...
STRUCTURE AND PHYSIOLOGY Geobacillus stearothermophilus is a thermophilic, aerobic bacterium that can form biofilms and heat-resistant spores. Gram stains as Gram-positive rods. TRANSMISSION AND DISEASE There is no public health-related significance. However, due to its thermophilic nature, this organism can be found in dairy plants and can form biofilms on stainless steel...
STRUCTURE AND PHYSIOLOGY Trichoderma virens is a fungus commonly found in soil that acts as a nonpathogenic parasite to plants. It can be characterized by its rapid growth and bright green spore that is formed at the tip of the hypha of the fungus. Growth is initially fluffy and white....
STRUCTURE AND PHYSIOLOGY Clostridium septicum is a large, motile, Gram-positive, anaerobic bacillus found in the normal gut flora of humans and other animals. Clostridium septicum is a motile, spore-forming pathogen commonly isolated from the intestinal flora of humans TRANSMISSION AND DISEASE Clostridium septicum is more virulent than Clostridium perfringens and can cause...
STRUCTURE AND PHYSIOLOGY Colonies of Mycosphaerella fijiensis are slow-growing on PDA. They are raised, compact and have a gray to pale-buff velvety surface. TRANSMISSION AND DISEASE Mycosphaerella fijiensis causes Black Leaf Streak in banana and plantain plants. It is spread from tree to tree by wind, rain, and irrigation water splashes. It...
Structure and Physiology This bacteria is a Gram-positive, rod shaped, endospore generating obligate anaerobe. Clostridium species are part of the normal human gut flora that produce spores which are highly resistant to chemical and environmental conditions. Transmission and Disease C. difficile is commonly associated with hospital acquired infections and is known to...
Structure and Physiology Bacillus subtilis is a spore forming, motile, rod-shaped, Gram-positive, facultative aerobe. It is mostly found in soil and vegetation with an optimal growth temperature from 25-35 degrees Celsius. B. subtilis has the ability to produce and secrete antibiotics. The genomic structure of this microorganism contains five signal...
Structure and PhysiologyBacillus cereus is a Gram-positive, rod-shaped, endopore-forming facultative aerobe bacterium related to Bacillus anthracis and Bacillus thuringiensis.Transmission and DiseaseAlthough B. cereus is commonly associated with food-borne illnesses, this microbe can also be responsible for several local and systemic infections.DisinfectionDue to this bacterium's ability to sporulate, B. cereus...
