Gram Positive Cocci | Staphylococcus | Staph. aureus, Staph. epidermidis, Staph. saprophyticus |
Автор: Learn Medical Health Sciences with Dr. Shaista
Загружено: 2024-08-26
Просмотров: 412
By Dr. Umair Khan (MBBS, FCPS)
#microbiology #microbiome #bacteria #bacteriology #viralvideo #trending #staphylococcus #staph #quick #revision #exam #preparation #concept
Gram-positive cocci:
Staph. aureus
Golden-yellow pigmentation
Coagulase-positive (can clot blood)
Catalase-positive (can break down hydrogen peroxide)
Pathogenic (can cause severe infections)
Can produce toxins and cause:
Abscesses
Pneumonia
Sepsis
Food poisoning
Often resistant to antibiotics (e.g., MRSA - Methicillin-resistant Staphylococcus aureus)
Staph. epidermidis
White or cream-colored
Coagulase-negative
Catalase-positive
Non-pathogenic (commensal on skin and mucous membranes)
Can cause infections in:
Immunocompromised individuals
Those with prosthetic devices (e.g., joint replacements, catheters)
Typically sensitive to antibiotics
Staph. saprophyticus
White or cream-colored
Coagulase-negative
Catalase-positive
Found in urinary tract and genital area
Can cause:
Urinary tract infections (UTIs)
Cystitis (bladder infections)
Pyelonephritis (kidney infections)
Typically sensitive to antibiotics
All three:
Are Gram-positive cocci
Are non-motile (don't move)
Have a peptidoglycan cell wall
Are facultative anaerobes (can grow with or without oxygen)
The three Gram-positive cocci can be abbreviated as:
Staph. aureus (Staphylococcus aureus)
Staph. epidermidis (Staphylococcus epidermidis)
Staph. saprophyticus (Staphylococcus saprophyticus)
This is a common way to abbreviate the names of these bacteria in medical and scientific notation. The "Staph." prefix indicates that it belongs to the Staphylococcus genus.
Staph. aureus
Golden-yellow pigmentation
Coagulase-positive
Catalase-positive
Pathogenic
Staph. epidermidis
White or cream-colored
Coagulase-negative
Catalase-positive
Non-pathogenic, commensal
Staph. saprophyticus
White or cream-colored
Coagulase-negative
Catalase-positive
Found in urinary tract and genital area, can cause UTIs

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