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Flashcards in houseflies and myiasis Deck (17)
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1
Q

define syanthropic

A

live in close association with man and human settlements

2
Q

4 types of housefly

A

Musca domestica
M. sorbens
Fannia
Stomoxys ‘stable fly’

3
Q

what doe hosueflies have in common with mites

A

they dont bloodfeed

4
Q

morphological characteristics of m.domestica

A

4 dark stripes on thorax

wing vein 4 bends to meet vein 3

5
Q

how do m.domestica feed

A

suck up liquid from food sides, regurgitate and defecate on body surface

6
Q

m.domestica transmit…

A

enteric bacteria like shigella, salmonella, e.coli
cholera
helminth eggs?
polio

7
Q

what behavioural differences are there between m.domestica and m.sorbens

A

D: endophilic, feed on food waste
S: exophilic, feed on faeces

8
Q

Medical importance of m.sorbens

A

chlamydia trachomatis- trachoma

9
Q

fannia transmits…

A

no disease but eggs laid on urine soaked bedding, animals, humans which leads to urino-genital myiasis

10
Q

how can you distinguish a housefly from a stable fly

A

stable fly has prominent forward pointing piercing proboscis that penetrates skin of cattle and man to suck blood

11
Q

wha are stable flies vectors of

A

trypanosomes in cattle

12
Q

what is myiasis

A

infestation of living tissues and organs by the larva of flies

13
Q
genus names for:
tumbuflies
botflies
screwworms
blowflies
fleshflies

which are obligatory and facultative parasites

A
cordylobia    (o)
dermatobia  (o)
cochliomyia  (o)
calliphora     (f)
sarcophaga   (f)
14
Q

tumbu fly and bot fly cause cutaneous myiasis, describe the pathology

A

Tumbu fly
eggs laid on urine soaked clothes or sandy soil
larvae burrow into skin and form boil-like swellings (buttocks genitalia back)
merge from skin and pupate in soil

Botfly
eggs attached to mosquito or stomxys
larvae hatch and drop onto skin
burrow into skin forming boil-like swellings

15
Q

describe invasive myiasis

A

screwworms (cochliomyia) invade natural orifices like nose mouth eyes
sever tissue trauma
screwworms have spines and are screw like

16
Q

describe non-invasive myiasis

A

blowflies (calliphora)
will infest and consume necrotic tissue
good for healing wounds

17
Q

control of houseflies

A
refuse disposal to prevent breeding
screening premises
traps
insecticide
sterile insect technique