Prev Med 6.11

Question 1

Distinguishing characteristic of fleas

Answer 1

ectoparasites of birds and mammals
chigoe flea is an exception its burros into the skin of the host
small laterally compressed, hard bodied insects that lack wings but have legs especially adapted for jumping
eat about once aday

Question 2

Disease importance of oriental rat flea

Answer 2

chief vector of the bubonic plague and flea born typhus

introduced to all of the world with Norway and roof rats

Question 3

general protective measure for fleas

Answer 3

avoid infested area whenever possible
wear PPE
application of insect repellent

Question 4

Treatment of breeding areas

Answer 4

in buildings spray emulsion on floor/rugs and wall surface to height of two feet above floor
yards and building should be treated with residual emulsion
prevent entry into building spray foundation to height of 2-3ft
dust rodent burrows with insecticide

Question 5

Describe hard ticks

Answer 5

distinct hard covering called scutum
attaches to host completely before engorgement is complete
larvae and nymph take on blood meal each
hard ticks have 2-3 host during development
female takes on blood meal before dropping of eggs

Question 6

diseases of hard ticks

Answer 6

Lymes disease
rocky mountain spotted fever
tickborne rickettsioses of eastern hemisphere

Question 7

describe soft ticks

Answer 7

lacks a scutum
hides in cracks and crevices until night to feed
larvae and nymph feed several times before molting
females feed a number of times laying eggs after eat feeding

Question 8

Disease of soft ticks

Answer 8

relapsing fever, bacterial infection that causes recurrent fever with headaches, muscle and joint aches

Question 9

How to control ticks

Answer 9

clear vegetations from area
apply insecticides as early in the year when ticks are noticed
remove all ticks found on the body at once

Question 10

describe Scabies or itch mite

Answer 10

transmits by close body contact
burrows into horny layers of dermis
causse intense itching and occasional erythema

Question 11

Describe food infesting mites

Answer 11

infest dry foods such as bread, cheese, cereals and smoked meats

Question 12

medical importance of food infesting mites

Answer 12

Dermatitis experienced by Workes dealing with them
respiratory complications when mites or by products inhaled
urinary tract infestations that cause irritation or urethral stricture
GI disturbances

Question 13

Describe nest inhabiting mites

Answer 13

Lives in bird or rodents nest only bites man when deprived of normal hosts
important member of mite group capable of vectoring rickettsialpox from mouse to man

Question 14

Three stages of Mite maturation

Answer 14

Larva
Nymph
Adult

Question 15

characteristics of mite larva

Answer 15

six legs
small red or pink
feed on lymph serous fluid
found in damp areas covered in vegetation
parasitic on rodents, incidentally parasitic to man

Question 16

Nymph and adult stages of mites

Answer 16

8 legs
free living
feeds on eggs of small insects and related invertebrates

Question 17

Larval chigger habitat

Answer 17

damp areas
margins of lake and streams
high grass or weeds

Question 18

How to control mites

Answer 18

personal equipment
repellent impregnant clothes
treatment on man with elimit
heat sterilization of clothing and bedding

Question 19

Controls for mite infested foods

Answer 19

dispose of infested material
sanitation of affected areas
use of residual sprays

Question 20

Describe bed bugs

Answer 20

infect warm blooded animals including man
no know vector of human disease
flat reddish, wingless and sucking mouthparts
bites producing small, hard white swellings
hide in seams of mattress and bedding

Question 21

control methods of bed bugs

Answer 21

pesticide applications along the
sides and seams of mattress
racks
corners of bunks
empty lockers
springs
canvas bottoms and grommets
stanchions
behind all equipment close to bulkhead

Question 22

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