Lab MCQs learning

Question 1

Schizonts are normally seen in which part of the body?

Answer 1

Deep tissue capillaries or the liver
they get sequestered in peripheral blood

Question 2

band form =

Answer 2

p.malariae late stage trophozoite

Question 3

stage of malaria infective to humans?

Answer 3

Sporozoites in mosquito injected into humans during blood meal

Question 4

Rocket cell =

Answer 4

p.ovale = fimbriation

Question 5

differentiate E.Coli and E. Histolytica/disbar cysts?

Answer 5

E coli is bigger (15-25) and has more nuclei (up to 8)
E histolytica/dispar are one of the smallest cysts (10-15). 3-4 nuclei.

Question 6

Intermediate host Schistosomia Haematobium?

Answer 6

Bulinus (snail)

Question 7

intermediate host Schistosomia Mansoni?

Answer 7

Biomphalaria (snail)

Question 8

Intermediate host Schistosomia Japonicum?

Answer 8

Oncomelania (snail)

Question 9

Target cells seen in which conditions?

Answer 9

seen in thalassaemia, iron def and sickle cell anaemia

Question 10

Pernicious anaemia and folic acid deficiencies are examples of

Answer 10

Megaloblastic anaemias (hypersegmented neutrophils)

Question 11

The only anaemia that is hypochromic, microcytic but is not iron deficiency anaemia is?

Answer 11

thallassaemia

Question 12

Which might you most expect to see on a blood smear for beta thalassaemia?

Answer 12

Target cells

Question 13

Howell-Jolly bodies seen in ?

Answer 13

Asplenia / splenic dysfunction - why else would surgeons know about it?

Question 14

Crustaceans, shellfish vector for?

Answer 14

P. Westermani

Question 15

which worm produces eggs that require development in the external environment before becoming infective

Answer 15

Trichuris Trichuria (whipworm) (STH)

Question 16

Which STHs can infect humans through the penetration of skin in just a few minutes

Answer 16

Hookworm, Strongyloides

Question 17

Which egg 70 micrometre in length, once developed in water, it will contain?

Answer 17

Coracidium

Cestode = tapeworm
Once passed into water the unembryonated egg develops to release coracidia. These will then be ingested by the first intermediate host, a crustacea

Question 18

ONLY parasite that can live outside the human as a free living adult
??

Answer 18

Strongyloides

Question 19

enterobius pinworm normally found where in adult?

Answer 19

perianal skin

Question 20

where might you find T Cruzii amastigotes?

Answer 20

When they lose flagellum, they may be seen in human tissues e.g. skin, muscle, heart

Question 21

parasites from the gut of a reduvid bug are likely to be which form?

Answer 21

epimastigote

Question 22

leishmania form in gut of sandfly?

Answer 22

promastigote

Question 23

T. cruzii in human blood - form?

Answer 23

trypomastigotes

Question 24

where might you find pheromastigote forms
of T cruzii?

Answer 24

VECTOR only - reduvid (assasin/kissing bug/triatomes)

Question 25

what are parasites responsible for cutaneous Leish old/new world

Answer 25

L. Tropica L. Braziliensis L. Mexicana

Question 26

This head of an adult tapeworm of humans causes neurocystercicosis - what is it?

Answer 26

Taenia Solium SCOLEX with HOOKS

Question 27

XXXXXX larva hangs upside down, showing a short syphon. Breeds in containers, old cans. Insect form lives close to human habitations - like tyres

Answer 27

Aedes

Question 28

which larva need aquatic plants?

Answer 28

Mansonia larva cause W.b in PNG also Brugia malayi

Question 29

Larvae in fresh- or salt-water marshes, mangrove swamps, rice fields, grassy ditches, edges or streams and rivers, small temporary rain ools. Breed in clearer/less ‘polluted’ waters, mostly in (but not only) in rural areas - which larvaae?

Answer 29

Anophyles

Question 30

Eggs laid/breed in: containers, domestic water jars, pots, old cans and motor tyes, leaf axils, tree-holes and some rock pools. ???

Answer 30

Aedes

Question 31

Can breed in very organically rich water like pit latrines, blocked drains. Also breeds in rice paddies, rice marshes and standing water. Larvae???

Answer 31

Culex

Question 32

which flea have lots of hair - moustache and mullet (combs)??

Answer 32

Cat and dog - not important!

Question 33

flea showing a meral rod, but no combs, what is it, what does it transmit?

Answer 33

Xenopsylla cheopsis Plague Murine endemic typhus

Question 34

These are dioecious trematodes, having both male and female individuals, which remain in copula for their lifetime. what and what is aim of control on population level?

Answer 34

Schistosomiasis Reducing morbidity

Question 35

Only in Asia. 2 terminal nuclei - 2 dots after it ends. Would only be present in the blood at night. Mosquito ???

Answer 35

brugia malayi mansonia

Question 36

sheathed microfilaria infection from the bite of a day biting FLY (Chrysops)

Answer 36

Loa Loa

Question 37

Nuclei would not go all the way to the end (empty sheath). Lymphatic filariasis. Much more common - present in Africa + Asia. Would only be present in the blood at night. ??

Answer 37

W. Bancrofti

Question 38

which ovum produces eggs that require development in the external environment before becoming infective

Answer 38

Trichuris Trichuria

Question 39

faeces sample in giardia?

Answer 39

smelly, explosive, greasy, float

Question 40

which mosquito causes: Brugia timori O nyong nyong Plasmodium falciparum Wuchereria bancrofti

Answer 40

anopheles long palps, banded wings

Question 41

Hard tick - how to tell, what does it transmit?

Answer 41

Tick - hard or soft? Hard if it has a scutum (black part) Borellia burgdorferi (Lyme)

Question 42

mosquito transmits yellow fever (obviously), Chikungunya, Dengue, sometimes filariasis, zika

Answer 42

Aedes

Question 43

which insects cause epidemic typhus (rickettsia prowazekii)?

Answer 43

Body louse

Question 44

Long siphon, pit latrine - which mosquito and what does it cause?

Answer 44

CuLex Lymphatic filariasis [Wuchereria bancrofti – nocturnally periodic] JEV, WNV and Rift Valley Fever

Question 45

What does sequestration mean?

Answer 45

Adherence of infected erythrocytes to the endothelium of capillaries and venules

Question 46

Schizont seen. Where does next stage of LC happen?

Answer 46

Mosquito

Question 47

Rural Peru, 10% population recent history of passage of tapeworm ~ 1.5cms. Eggs, 35-45 μm detected in 2% samples. 43% of local, free-ranging pigs had lesions 8mm in tongue, diaphragm and other muscles. The parasite stages detected are most likely to be those of:

Answer 47

T. Solium

Question 48

Entamoeba histolytica can be distinguished from Entamoeba dispar using a?

Answer 48

specific faecal Ag test

Question 49

tourist returns to the UK from West Africa with two boil-like lesions on his lower back. One of the lesions is found to contain a maggot-like larva. The most likely way in which the patient became infected was by:

Answer 49

Cordylobia - clothes (drying clothes worn by person - then get infected)