Vector Control

Question 1

Which vector causes Chagas disease?
A. Glossina
B. Triatomine tick
C. Phlebotomus sandflies
D. Ochlerotatus mosquito

Answer 1

B

A- trypanosomiasis
C -leishmania

Question 2

Which vector causes lymphatic filariasis?
A. Glossina
B. Triatomine tick
C. Phlebotomus sandflies
D. Ochlerotatus mosquito

Answer 2

D

Question 3

How can population migration increase vector-borne disease?

Answer 3

unplanned urbanization –> open sewers and water storage containers
PLUS↑ population density –> humans are preferred

Question 4

Which is false?
A. Aedes aegypti biting patterns are also being affected and modified by changing environments and climate
B.↑ diseases associated with mosquitoes due to
cooler climates and ↑ rainfall as a result of global
climate change
C. BOTA

Answer 4

B

Dapat warmer climate!!

Question 5

Enumerate 3 factors that may affect vector control

Answer 5

1. Advanced technology
2. Modern pesticides – can cause side effects
3. Man’s ability to modify environmental conditions

Question 6

Which vector has larvae parallel to water surface?
A. Anopheles mosquito
B. Aedes mosquito
C. Culex mosquito
D. Ochlerotatus mosquito

Answer 6

A

Question 7

Which vector has larvae 45 degrees to water surface?
A. Anopheles mosquito
B. Aedes mosquito
C. Culex mosquito
D. Ochlerotatus mosquito

Answer 7

C

Question 8

Which vector "loves" permanent polluted water?
A. Anopheles mosquito
B. Aedes mosquito
C. Culex mosquito
D. Ochlerotatus mosquito

Answer 8

C

Question 9

Differentiate endemic from outbreak

Answer 9

Endemic – continually present at a steady level

Outbreak – slight increase over endemic level

Question 10

Which type is most common @ PHL? Also causes cerebral malaria.
A. P.vivax
B. P.falciparum
C. P.malariae
D. P.ovale

Answer 10

B

Question 11

Yellow fever is affected by jungle urban cycle of Aedes aegypti. Explain please!

Answer 11

For the person: trips to the forest: trekking (bitten by the mosquito -> goes back to the city (gets sick)

Shifts between forest/jungle habitat to urban/indoor habitat

Question 12

Which is false?
A. Yellow fever may be controlled via vaccine.
B. Humans are natural hosts of encephalitis virus.
C. Flies are both mechanical & biological vectors.
D.Ectoparasite control should be done prior to trapping.

Answer 12

B

birds dapat

Question 13

Enumerate 3 factors part of the early control program for vector control?

Answer 13

Screening of houses
Use of mosquito nets (pesticide-impregnated)
Drainage or filling of swamps and other water sources

Question 14

Which is/are used on adult mosquitoes?
A. aspirator
B. light traps
C. syringe and vial
D. dipper

Answer 14

A & B

Question 15

Which is/are used on larvae mosquitoes? How?
A. aspirator
B. light traps
C. syringe and vial
D. dipper

Answer 15

C & D

D: Placing the lip of the dipper under the water surface → pull forward; Larvae are counted and recorded

Question 16

Why are fumigants problematic?

Answer 16

they do not kill; adults are just displaced, no effect to larvae, short term effect

Question 17

Factors affecting level of pesticides in food chains- enumerate the 4

Answer 17

1. Amount of pesticide ingested
2. Time period over which pesticides are ingested
3. Pesticide-storage capability of animal
4. Rate of detoxification and excretion

Question 18

What incident revealed the revealed adverse side effects of DDT to humans and the environment in general?

Answer 18

Rachel Carson’s Silent Spring

Question 19

How does biological control work for mosquitoes?

Answer 19

Small fishes – eat larvae

 Birds, bats and dragonflies – eat adult mosquitoes

Question 20

not a disadvantage of mosquito biological control for humans
A. Parasitic infestations
B. Exposure to harmful toxins
C. Allergic reactions
D. Increased risk of NCDs

Answer 20

D

Question 21

What won't happen to beneficial organisms bc of mosquito bio control?
A. Infestation
B. Predation
C. Multiplication
D. Displacement

Answer 21

C

Question 22

Enumerate DOH 4S strategy against dengue

Answer 22

Search and destroy - breeding places
Self protection measures
Seek early consultation
Say “no” to indiscriminate fogging

Question 23

Differentiate Breteau index (BI) from Container Index (CI)–

Answer 23

Breteau index (BI) – number of positive containers per 100 houses inspected
Container index (CI) – percentage of water-holding containers infested with larvae or pupae.

Question 24

Enumerate components of the DOST’S Ovi Trap!! + purpose of each

Answer 24

black can/cup: female Aedes LOVE black
OL pellets + water: to KILL
lawanit paddle: attract Aedes to lay eggs there. TRAP!!

Question 25

Which is false? A. household garbage - most important source of flies B. flies are mechanical vectors of anthrax C. a gravid female fly can lay 100-150 eggs D. Cockroaches can be prevented via regular handwashing.

Answer 25

B - biological dapat

Question 26

Cockroaches family name

Answer 26

Blattidae

Question 27

False about Cimex lecturalis A.Hide in crevices and cracks, feed at night B.Nuisance and may cause hypersensitivity reactions C.Control through insecticides and regular handwashing D.No larva stage

Answer 27

C | bed bugs ito kaya little effect ang handwashing

Question 28

``` lice are vectors for all except A. pediculosis B. epidemic typhus C. relapsing fever D. plague ```

Answer 28

D - kasi sa Xenopsylla cheopis ito

Question 29

``` Rodents are not reservoirs for/ A. leptospirosis B. salmonellosis C. murine typhus D. NOTA ```

Answer 29

C - they are host for the tick & the flea (Xenopsylla cheopis)

Question 30

Which is not true about rats? A.Keen sense of touch B.color blind C.Taste sense well developed

Answer 30

C A- through vibrissae and tactile hairs

Question 31

Enumerate the 3 things revealed @ rodent surveillance

Answer 31

species population density frequency

Question 32

Which instrument is used to Detects rat urine stains

Answer 32

phosphorescent UV light bulb

Question 33

Name 2 rodenticides + effect @ rat

Answer 33

Anticoagulants - warfarin (bleed to death) | Red squill –natural emetic (causes vomiting)

Question 34

``` vector of Guinea worm A. Copepod B. Triatomine tick C. Phlebotomus sandflies D. Ochlerotatus mosquito ```

Answer 34

A

Question 35

``` lack of control of this vector may increase cases of river blindness A. Glossina B. Triatomine tick C. Black fly D. Ochlerotatus mosquito ```

Answer 35

C