Chapter 4 Page 2

Question 1

Family Demodicidae:

Answer 1

unusual family of mites (that become specialised skin parasites of humans and other mammals.
-They are HOST-SPECIFIC.

Question 2

Demodex cati

Answer 2

Cat

Question 3

Demodex equi

Answer 3

horses

Question 4

Demodex phylloides

Answer 4

pigs

Question 5

Demodex bovis

Answer 5

cattle

Question 6

Demodex musculi

Answer 6

mice

Question 7

Demodex caviae

Answer 7

guinea pigs

Question 8

Two species that live on humans:

Answer 8

Demodex folliculorum

Demodex brevis

Question 9

Demodex Folliculorum:

Answer 9

carrot shaped and lives in the hair follicle of simple hair.

Question 10

Demodex Brevis

Answer 10

has a shorter stumpy body and lives in the sebaceous glands of vellus hair.

Question 11

The life cycle of Demodex Folliculorum:

Answer 11

consists of an egg, larval, protonymph, deutonymph, and adult stage. (Takes about 14-18 days)

Question 12

1) mites feed on ….

2) eggs are laid on …

Answer 12

1) host cells

2) hosts skin

Question 13

Family Sarcoptidae:

Answer 13

contains scabies mites:
Sarcoptes scabiei
Knemidocoptes mutans (scaly legs in hens)
Notoedres cati: cats/dogs

Question 14

Genus Sarcoptes:

Answer 14

Sarcoptes scabiei exists as a variety of Host-Specific Sub-Species.

Question 15

Example of sarcoptes host-specific sub-species

Answer 15

1) Humans are infected by Sarcoptes scabiei var hominis

2) Dogs are infected by Sarcoptes scabiei var canis

Question 16

Mite infestation can be an indicator of

Answer 16

poverty/neglect

Question 17

The mites are protected within their burrows and are not removed by frequent washing i

Answer 17

hot soapy water

Question 18

Scabies is a problem with cramped unhygienic circumstances

Answer 18

in the urban squatter settlements and refugee camps.

Question 19

Sarcoptes scabiei are small circular-shaped mite with small legs.

Answer 19

Front 2 pair of legs terminate in structure called pedicels that look a bit like SINK PLUNGERS.

Question 20

Scabies are transmitted by

Answer 20

15-20 minutes of close physical contact and depends on the # of mites involved.

Question 21

Scabies can be a particular problem for poor people and children b/c they

Answer 21

wear fewer clothes in the tropical countries due to the heat.
Night = sleeping together on a bed, bunk, hammock there is more skin contact increasing chances of getting it