BASIC - LAB 3

Question 1

what is the ability of an organism to cause disease

Answer 1

pathogenicity

Question 2

why are some bacteria highly virulent

Answer 2

due to the presence of virulence factors

Question 3

______ refers to the degree of pathogenicity within a group or species of microogranisms

Answer 3

virulence

Question 4

presence of virulence factors ______ host deferenses, assist bacterial survival, and damage tissues

Answer 4

decreases

Question 5

strict pathogens are ___ associated with pathogenicity such as ___ and ____

Answer 5

always
m. tb, n. gonorrhoeae

Question 6

____ take advantage of the environment and a compromised host to cause infection

Answer 6

opportunistic pathogens

Question 7

what bacteria typically colonize in host as normal flora and are often beneficial to host

Answer 7

commensals

Question 8

what are bacterial enzymes that coagulate plasma and are involved in abcess formation

Answer 8

coagulases

Question 9

what species produce coagulases

Answer 9

some staphylococci species

Question 10

coagulase tests are used to

Answer 10

differentiate between coagulase positive (s. aureus) and coagulative negative (s. epidermis)

Question 11

is s. aureus coagulase positive or negative?

Answer 11

positive

Question 12

is s. epidermis positive or negative?

Answer 12

negative

Question 13

how does coagulase work

Answer 13

it binds plasma fibrinogen causing a clot in the plasma to gorm

Question 14

what is a serological test designed to detect the presence of antibodies for specific microbial antigens in serum

Answer 14

agglutination

Question 15

what type of antibiotics are administered based on laboratory results - when the organism is identified

Answer 15

therapeutic

Question 16

what bacteria is a lactose fermenter

Answer 16

e coli

Question 17

what bacteria are non lactose fermenters

Answer 17

p aeruginosa, salmonella

Question 18

what bacteria are mannitol fermenters

Answer 18

s aureus

Question 19

what bacteria are non mannitol fermenters

Answer 19

s epidermis

Question 20

the primary causes of a urinary tract infection are

Answer 20

staphylococci , e coli and pseudomonas

Question 21

bacterial antigens are categorized into 3 broad types based on their origin

Answer 21

o, h, k

Question 22

o antigens are derived from

Answer 22

cell wall of gram negative bacteria

Question 23

h antigens are derived from

Answer 23

flagella of motile enteric bacilli

Question 24

k antigens are derived from

Answer 24

surface antigen secreted by the organism

Question 25

E coli O157 causes

Answer 25

severe gastroenteritis

Question 26

salmonella O D9-12 causes

Answer 26

typohoid fever

Question 27

agglutination test is useful in detecting _____ carriers who harbor the bacteria but are asymptomatic

Answer 27

salmonella