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بكتيريا 1 > ch 2 streptococci > Flashcards

ch 2 streptococci Flashcards

1
Q

Streptococci are

A

Gram positive, cocci, chain

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2
Q

Streptococci grow in temp

A

at 35–37 °C with 5% CO 2

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3
Q

All Streptococci are catalase.

A

negative

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4
Q

why do not use catalase on blood agar

A

bacuse RBCs have catalase will give postive fals result

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5
Q

Streptococcus pyogenes A media and colony

A

Blood agar

B-hemolysis

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6
Q

Streptococcus agalactiae media and colony
(Group B Streptococci)

A

Blood agar

B-hemolysis

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7
Q

Susceptibility to bacitracin disc

A

A - Sensitive to bacitracin
B - Resistant

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8
Q

cAMP test

A

A - Negative
B - Postive

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9
Q

Hippurate test

A

A- Negative (No color)
B - Postive ( purble)

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10
Q

cAMP Test is

A

is used to identify Streptococcus agalactiae (group B Streptococci)

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11
Q

Hippurate Test
Enzyme:. End Products:
Substrate:

A

Enzyme: hippuricase. End Products: glycine and benzoate.
Substrate: hippurate

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12
Q

Pyrogenic Exotoxins وش تسبب

A

pyrogenic exotoxins
flesh-eating bacteria
skin-eating streptococci

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13
Q

Diseases caused by Streptococcus pyogenes

A

Pharyngitis
• Tonsillitis
• Otitis
• Pneumonia

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14
Q

Treatment of Group A Streptococci

A

Penicillin

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15
Q

CAMP factor:

A

Forms pores in host-cell membrane

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16
Q

Pili

A

promotes adherence of GBS to host cells

17
Q

Diseases caused by Streptococcus agalactiae:

A

Neonatal meningitis
• Pneumonia
• Sepsis
• UTI

18
Q

Treatment of Group B Streptococci:

A

Penicillin

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