問題一覧
1
Which of the following is associated with biofilm associated infection due to contamination of prosthetic
all the above
2
Biofilm bacteria are less susceptible to out immune system, and consequently a biofilm associated infections can persist for a lengthy period.
True
3
The clear around the disk on a disk diffusion is
zone of inhibition, no growth
4
Penicillin drug in lab activity o birby bauer was found to be. Because it did not work.
narrow spectrum, against G- bacteria
5
Which standard unit is used to measure the zone of inhibition
mm
6
Which of the following medium is most suited for kirby bauer method
nutrient muller Hinton agar
7
Appearance of colonies growing inside zone of inhibition indicate drug resistant variants present in culture used to study
true
8
Antibiotics can be used to to treat viral infection
False
9
Antibiotics susceptibility mean drug cannot kill a certain bacteria
false
10
Most commonly used McFarland standard for isk diffusion method is 0.5
true
11
Type of hemolysis caused by streptococcus pyogenes is called
beta hemolysis
12
What appearance does alpha hemolysis produce
dirty green color
13
Which of the following is a differential growth media used for streptococci
sheep blood agar
14
What appearance does gama hemolytic bacteria produce
no change in color
15
A small percentage of hemolosyns enzymes are oxygen liable that is why steptococci must be grown in which of the following condition to observe hemolosys
candle jar 5% CO2 anaerobic jar
16
what speiceis of streptococci are beta hemolytic
S. pyogenes and s.agalactae
17
Beta hemolytic, A group streptococcus (s.pyogen) cause s step throat
true
18
Which of the following is not consider a normal flora in the human throat
beta hemolytic s. pyogenes
19
Which speiceis of streptococcus is susceptible to bacitracin disk
group A s. pyogenes
20
Which of the following disease of central nervous system sometimes caused by respiratory normal flora such as s,pneumonia
meningitis
21
Which of the following gram positive alpha hemolytic cocci can be can be distinguish from each other based on optochin sensitivity
pneumonia and viridans
22
CAMP test is used to distinguish alpha hemolytic streptococci from staphylococci
False
23
What type of bacteria will grow on bile esculin media
e. fecalis
24
Viral colonies from a person with Viral sore throat will cause complete hemolysis on BAP
False
25
What make bile esculin a selective media
bile
26
What is differential property of bile esculin media
esculin
27
What does positive bile esculin test look like
it forms black persipication
28
What is the color of lactose fermenter enteric colonies on macconkey
pink/ purple
29
Idole test is done on a specific growth medium and it confirms
breakdown of amino acid tryptophan in that medium
30
Opportunist pathogens
cause disease only in immune compromised host
31
The urease is an enzyme that hydrolysis urea and the color of the broth turns
fuchsia pink
32
Which of the following are non lactose fermenter and true GI tract pathogens
shigella and salmonella
33
28 year old female experience frequent painful urination. Gram negative lactose fermenting rods cultured from her urine. Most likely etiology is
e coli
34
All the following is true about staphylococcus aureus exept
it is an appornistic pathogen
35
Mannitol salt agar is selective medium withannitol as a protein source
false
36
Which of the following represents a graphite cluster of cocci and one of its species is most common flora of human skin
staphylococci
37
MSA is a selective medium and contains a higher concentration, a PH indicator and mannitol sugar. Which of the following make it selective medium
salt
38
microbes such as S. aureus containing thus group of enzyme are consider serious pathogens
beta hemolysis and coagulase
39
A suspected staphylococcus is isolated in the lab which of the following test would be used to identify it as staphylococcus aureus
coagolase
40
The staphylococcus culture on BAP that show beta hemolysis is most likely s. Aureus
true
41
Which of the following is a major culprit of nosocomial wound infection
MRSA
42
A gram positive coccus was isolated from urine sample of an adolescent female and was found to be resistant to novobiocin, which of the following is the most likely speiceis present
staphylococcus saprophiticus