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Flashcards in Rickettsiae Deck (43):
1

causative agent of typhus fever

Rickettsia prowasekii

2

during World War I, this diagnostic agglutination test for typhus was developed

Weil-Felix reaction

3

false about Rickettsiae:
a. anaerobic
b. Gram (-) but Gram stain poorly
c. contains LPS and peptidoglycan
d. all of the above are true

A

aerobic sila

4

false about Rickettsiae:
a. Obligate intarcellular parasites (except for Rochalimaea)
b. require growth cofactors (e.g. acetyl-CoA, NAD, ATP) provided by the cell
c. grow on artificial media & on cytoplasm of eukaryotic cells
d. all of the above are true

C

They do not grow on artificial media

5

After transmission, Rickettsia multiplies in endothelial cells of ___

capillaries

6

Which does not happen in pathogenesis of Rickettsiae?
A. local hypersensitivity
B. regional lymphadenopathy
C. intracellular multiplication
D. none of the above

D

7

Rickettsia may be transmitted through these invertebrates (to humans), except
A. fleas
B. mites
C. ticks
D. spiders

D

8

T or F
Transmission of Rickettsiae in arthropods is transovarial.

T

9

Another name for epidemic recrudesent typhus

Brill-Zinsser typhus

10

Causative agent of Boutonneuse typhus
A. R.canari
B. R. akari
C. R. tsutsugamushi
D. All of the 3

A

11

Causative agent of Rickettsial pox
A. R.canari
B. R. akari
C. R. tsutsugamushi
D. All of the 3

B

12

Causative agent of Scrub typhus
A. R.canari
B. R. akari
C. R. tsutsugamushi
D. All of the 3

C

13

Enumerate the scientific names of the vectors of epidemic typhus

Pediculus humanus corporis
Pediculus humanus capitis

14

One of the symptoms of epidemic typhus is maccular rash after 4-7 days. True or false?

true

15

This type of typhus occurs after the person recovered from epidemic typhus and reactivation of R.prowazekii which remained latent for many years

Brill-Zinsser typhus

16

another name for endemic typhus

murine typhus

17

causative agent of endemic typhus

R. typhi

18

vector of endemic typhus

Xenopsylla cheopis

19

Rocky Mountain Spotted fever is caused by __

R. rickettsii

20

False about rash @ Rocky Mountain spotted fever
A. spread is from trunk to extremites
B. sharply defined maculopapular
C. both are true
D. both are false

A

baliktad

21

benign febrile illness with vesicular rash resembling chicken pox

rickettsial pox

22

vector of Rickettsial pox

Liponyssoides sanguineus

23

reservoir host of Rickettsial pox

Mus musculus

24

Species formerly under Rochalimaea genus are now under ___ genus

Bartonella

25

Some Rickettsia species may cause eschar. Which of the ff bacteria may also cause eschar:
A. Bacillus anthracis
B. Yersinia pestis
C. Vibrio cholerae
D. Streptococcus agalactiae

A

26

gold standard in diagnosing Rickettsial infection

culture and isolation

27

PCR may be used to confirm diagnosis of ___ when infection

ehrlichiosis

28

In Weil-Felix test, what strains are used to find rickettsial antibodies in patient serum?
A. non-motile Shigella strains
B. motile Salmonella strains
C. non-motile Proteus strains
D. motile Enterobacter strains

C

29

Most common strain used in Weil-Felix test

OX 19

30

In Weil-Felix test, the doctor can diagnose endemic/epidemic typhus if
A. strong agglutination with OX19 and OX2
B. strong agglutination with OX 19
C. strong agglutination with OX K
D. strong agglutination with OX 2

B

31

primary reservoir of R.ricketsii

ticks

32

mode of transmission of R.prowazekii

breaks in skin c/o body louse

33

mode of transmission of R.typhi

infected flea inoculates via skin break

34

Coxiella burnetii has two modes of transmission. Enumerate.

airborne particles from contaminated sources
+ ingestion of unpasteurized milk

35

How is Ehrlichia chaffeensis transmitted?

break in skin via infected tick

36

mode of transmission of R.akari

mites

37

mode of transmission of R.canari

ticks

38

T or F. Squirrels are reservoir hosts of R.prowazekii

T

39

Which is not a reservoir host of Coxiella burnetii?
A. cattle
B. sheep
C. goats
D. humans

D

40

Coxiella burnetii causes __

Q fever

41

What is the etiologic agent of trench fever?

Rochalimaea quintana
OR
Bartonella quintana

42

What is pellosis?

pathological entity characterized by gross appearance of multiple cyst-like, blood-filled cavities within parenchymatous organs

43

What is the etiologic agent of bacillary pellosis?

Rochalimaea henselae
OR
Bartonella henselae