The picture above represents which of the following bacteria?
A.) Bacillus subtilis
B.) Staphylococcus aureus
C.) Mycobacterium chelonae
D.) Acinetobacter calcoaceticus genospecies 3
E.) None of the above
 
 
Answer: B.) Staphylococcus aureus
An aerobic gram-positive coccus that produces smooth colonies. Pigmentation of the colonies may range from gray, gray-white, yellow, yellow-orange or orange. It produces both free and bound coagulases and hemolysins (exotoxins). Some isolates produce an epidermolytic toxin that is responsible for the staphylococcal scalded skin syndrome. Some isolates produce endotoxins which when ingested are responsible for staphylococcal food poisoning. It can be part of the normal flora of the skin, skin glands, anterior nares, mucous membranes, gastrointestinal tract, and genital tract of humans, warm-blooded animals, and birds. It is an opportunistic pathogen causing a wide range of infections including: furuncles (boils), carbuncles, impetigo, epidermal necrolysis, osteomyelitis, meningitis, endocarditis, pneumonia, mastitis, bacteremia, enterocolitis, staphylococcal food poisoning and toxic shock syndrome. S. aureus is a spherical bacterium (coccus) which on microscopic examination appears in pairs, short chains, or bunched, grape-like clusters. Some strains are capable of producing a highly heat-stable protein toxin that causes illness in humans.  Staphylococci exist in air, dust, sewage, water, milk, and food or on food equipment, environmental surfaces, humans, and animals.
 
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