Fleas and Lice - Lec

Question 1

False about flea morphology
A.with wings
B.Laterally compressed body
C.Heavily sclerotized
D.no ocelli

Answer 1

A - they are wingless

Question 2

Ctenidia are comblike structures for __

Answer 2

attachment to fur and feathers

Question 3

Which is false about the flea?
A.Not all fleas have eyes
B.Females are larger than males
C.Both larva & adult form are hematophagous

Answer 3

C
only adult sucks blood
larva: debris-eater

Question 4

Flea's pleural arch is made up of
A.ctenidia
B.resin
C.resilin
D.NOTA

Answer 4

C

Question 5

T/F
The tip of the abdomen of male fleas is turned downward, while the tip of the abdomen of females are
turned upward.

Answer 5

F
male - upward (exposed genitalia)
female- downward

Question 6

Which belongs to a different family?
A. Tunga penetrans 
B. Pulex irritans 
C. Echidnophaga gallinacea
D. Ctenocephalides canis

Answer 6

A

The rest - family Pulicidae

Question 7

Which has ctenidia?
A.Pulex irritans
B.Ctenocephalides felis
C.Xenopsylla chaeopis

Answer 7

B

Question 8

Main diff of dog & cat flea?

Answer 8

Genal ctenidia have diff structures

Question 9

Which is false?
A.Echidnophaga gallinacea relationship with host is permanent
B.Tunga penetrans is embedded in the skin of the host
C.BOTA
D.NOTA

Answer 9

D

Question 10

Which is false?
A. a flea has hemimetabulous life cycle
B. pupa forms from third instal larva
C. larva may ingest Dipyllidium caninum

Answer 10

A - holometabulous dapat

Question 11

Which is false?
A. pneumonic plague requires the bite of the flea
B. live attenuated vaccine for plague may only be used for those with constant exposure

Answer 11

A - no required bite

Question 12

Why is Xenopsylla cheopis an effective vector for Yersinia pestis?

Answer 12

1. Bacteria block proventriculus of flea so no blood reaches the stomach
2. Grows ravenous since it was starving to death
3. Bites another host
4. Sucks blood but only disgorges it back into the host’s blood steam

Question 13

(a) flea vector of murine typhus

(b) most important condition that facilitates the spread of murine typhus is __,

Answer 13

crowding

Question 14

(a) another name for Tunga penetrates

(b) type of soil where it is usually found

Answer 14

(a) chigger

(b) sand

Question 15

Echidnophaga gallinacea is also known as __

Answer 15

poultry pest

Question 16

False about Order Anoplura
A. head narrower than thorax
B. distinct external segmentation
C. female larger than male
D. may be transmitted by fomites

Answer 16

B: indistinct dapat

Question 17

Why do lice victims have cemented hair?

Answer 17

dark red excreta of lice cause hair to stick together

Question 18

more frequently encountered in the tropics
A. Pediculus humanus corporis
B. Pediculus humanus capitis
C. equal

Answer 18

B

Question 19

more frequently encountered in the temperate areas
A. Pediculus humanus corporis
B. Pediculus humanus capitis
C. equal

Answer 19

A

Question 20

false about Pthirus pubis
A. prefers coarser texture and thicker diameter to get a good grasp and stay in place
B. found in pubic area only
C. may be transmitted by sharing of towels/undergarments

Answer 20

B - may also be found @ armpits

Question 21

A. What is Vagabond’s disease?

B. What is plica polonica?

Answer 21

A.Vagabond’s Disease-darkened thickened skin due to severe infestation
B. Plica polonica- thickly matted hair caused by the excreta of the lice (adhesive)

Question 22

A. egg of the louse is called __

B. How many moults does it take before it reaches adult stage?

Answer 22

A. nit

B. 3