Fleas and Lice - Lec Flashcards
False about flea morphology A.with wings B.Laterally compressed body C.Heavily sclerotized D.no ocelli
A - they are wingless
Ctenidia are comblike structures for __
attachment to fur and feathers
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
C
only adult sucks blood
larva: debris-eater
Flea's pleural arch is made up of A.ctenidia B.resin C.resilin D.NOTA
C
T/F
The tip of the abdomen of male fleas is turned downward, while the tip of the abdomen of females are
turned upward.
F
male - upward (exposed genitalia)
female- downward
Which belongs to a different family? A. Tunga penetrans B. Pulex irritans C. Echidnophaga gallinacea D. Ctenocephalides canis
A
The rest - family Pulicidae
Which has ctenidia?
A.Pulex irritans
B.Ctenocephalides felis
C.Xenopsylla chaeopis
B
Main diff of dog & cat flea?
Genal ctenidia have diff structures
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
D
Which is false?
A. a flea has hemimetabulous life cycle
B. pupa forms from third instal larva
C. larva may ingest Dipyllidium caninum
A - holometabulous dapat
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
A - no required bite
Why is Xenopsylla cheopis an effective vector for Yersinia pestis?
- Bacteria block proventriculus of flea so no blood reaches the stomach
- Grows ravenous since it was starving to death
- Bites another host
- Sucks blood but only disgorges it back into the host’s blood steam
(a) flea vector of murine typhus
(b) most important condition that facilitates the spread of murine typhus is __,
crowding
(a) another name for Tunga penetrates
(b) type of soil where it is usually found
(a) chigger
(b) sand
Echidnophaga gallinacea is also known as __
poultry pest
False about Order Anoplura A. head narrower than thorax B. distinct external segmentation C. female larger than male D. may be transmitted by fomites
B: indistinct dapat
Why do lice victims have cemented hair?
dark red excreta of lice cause hair to stick together
more frequently encountered in the tropics
A. Pediculus humanus corporis
B. Pediculus humanus capitis
C. equal
B
more frequently encountered in the temperate areas
A. Pediculus humanus corporis
B. Pediculus humanus capitis
C. equal
A
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
B - may also be found @ armpits
A. What is Vagabond’s disease?
B. What is plica polonica?
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)
A. egg of the louse is called __
B. How many moults does it take before it reaches adult stage?
A. nit
B. 3
