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Medical Microbiology > Bactira > Flashcards

Bactira Flashcards

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Biology 101 flashcards USMLE® Step 1 flashcards
1
Q

How can differentere between staph and strep?
And between staph family

A

By catalas test ➡️staph + and strep -
By coagulas test ➡️staph .auras + another ( epidermis ➕saprophyticus)

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2
Q

genas staphylococcus ؟

A

gram+
Cocci in cluster
Non motail

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3
Q

Common Tybe of staphylococcus?

A

S.auras

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4
Q

What is distinguished feature s. auras?

A

Small
Golden yellow colony in blood agar and farmantation mentanol in mentanol salt agar
B hymolatic positiv ➡️all Tybe of staph is negative

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5
Q

What is reservoir and transition s.auras ?

A

Reservoir:nasal mucosa and skin it well be in normal flora in (25-30% populations carriers) النسبه للميكوزا
Transetion: hand +sneezing+surgical wounds +contamination foods

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6
Q

What is predisposing factor for infection in s.auras?

A

Surgery and Wound
Foragen body (like tampons ,sutures ,backing)
Sever neutropena اقل من 500
IV abuse
Chronic granulomatous
Cystic fibrosis

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7
Q

What is bathogenesis s.auras?

A

Prioren A ➡️bind Fc components of IgG. (phagocytosis)بتالي بمنع الماكروفاج من الارتباط اذا منع عمليه
Enterotoxin➡️food bossing by fast acting and ❗️heat stableهرن مهم كلمه
TSST1➡️Supraantagen(cytokines Strom)
Coagulates ➡️clot بتالي بعمل Fibrinogen to Fibern ‎هاد بحول
Cytolytic toxine (a toxin)➡️ Pore forming Toxi like pVL(panton valintin leucocidan) بعمل على زياده الشرايسه متلا في MRSA
Exfolitine ➡️skin exfoltine toxine بعمل Scalded skin Syndrom and impetigo and bullos الفقاعات

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8
Q

What is knows about TSST1 ?

A

*superantigen
*non specific ➡️to pinding of toxin to receptor triggers ➡️excessive immune response

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9
Q

What is mechanism staphylococcus enterotoxin?

A

Vomiting➡️by directly effects in intestinal epithelium that stumulation of vages nerve that transition signal to the vomiting center in the brain.

Diarrhoea➡️by distrub activity in large intestines (water can’t absorption in large intestine).

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10
Q

What is distinctive characteristic of s. auras about anthor bacteria Tybe ?

A

Heat stable ➡️all Tybe Bactria is heat boil يعني كل انواع البكتيريا بتموت بالحراره ما عدا هاد النوع بتحمل الحراره

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11
Q

S. auras that case many diseas like ?

A

Slide 13+14

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12
Q

S.auras most common case to ?

A

*Acut indocardiatis
*osteomylites ➡️and arthritis either hematogenous or traumatic cased by s.auraus in children

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13
Q

ERYSIPELOTHRIX Reservoir? Transmission

A

Manly swine الخنازير Reservoir✔️

Humans acquire the infection through occupational exposure, such as cuts & scratches (fish handlers, animal products). Transmission✔️

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Medical Microbiology (5 decks)

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