Lab MCQs learning Flashcards
Schizonts are normally seen in which part of the body?
Deep tissue capillaries or the liver
they get sequestered in peripheral blood
band form =
p.malariae late stage trophozoite
stage of malaria infective to humans?
Sporozoites in mosquito injected into humans during blood meal
Rocket cell =
p.ovale = fimbriation
differentiate E.Coli and E. Histolytica/disbar cysts?
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.
Intermediate host Schistosomia Haematobium?
Bulinus (snail)
intermediate host Schistosomia Mansoni?
Biomphalaria (snail)
Intermediate host Schistosomia Japonicum?
Oncomelania (snail)
Target cells seen in which conditions?
seen in thalassaemia, iron def and sickle cell anaemia
Pernicious anaemia and folic acid deficiencies are examples of
Megaloblastic anaemias (hypersegmented neutrophils)
The only anaemia that is hypochromic, microcytic but is not iron deficiency anaemia is?
thallassaemia
Which might you most expect to see on a blood smear for beta thalassaemia?
Target cells
Howell-Jolly bodies seen in ?
Asplenia / splenic dysfunction - why else would surgeons know about it?
Crustaceans, shellfish vector for?
P. Westermani
which worm produces eggs that require development in the external environment before becoming infective
Trichuris Trichuria (whipworm) (STH)
Which STHs can infect humans through the penetration of skin in just a few minutes
Hookworm, Strongyloides
Which egg 70 micrometre in length, once developed in water, it will contain?
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
ONLY parasite that can live outside the human as a free living adult
??
Strongyloides
enterobius pinworm normally found where in adult?
perianal skin
where might you find T Cruzii amastigotes?
When they lose flagellum, they may be seen in human tissues e.g. skin, muscle, heart
parasites from the gut of a reduvid bug are likely to be which form?
epimastigote
leishmania form in gut of sandfly?
promastigote
T. cruzii in human blood - form?
trypomastigotes
where might you find pheromastigote forms
of T cruzii?
VECTOR only - reduvid (assasin/kissing bug/triatomes)
what are parasites responsible for cutaneous Leish old/new world
L. Tropica
L. Braziliensis
L. Mexicana
This head of an adult tapeworm of humans causes neurocystercicosis - what is it?
Taenia Solium
SCOLEX with HOOKS
XXXXXX larva hangs upside down, showing a short syphon. Breeds in containers, old cans. Insect form lives close to human habitations - like tyres
Aedes
which larva need aquatic plants?
Mansonia larva
cause W.b in PNG
also Brugia malayi
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?
Anophyles
Eggs laid/breed in: containers, domestic water jars, pots, old cans and motor tyes, leaf axils, tree-holes and some rock pools. ???
Aedes
Can breed in very organically rich water like pit latrines, blocked drains.
Also breeds in rice paddies, rice marshes and standing water.
Larvae???
Culex
which flea have lots of hair - moustache and mullet (combs)??
Cat and dog - not important!
flea showing a meral rod, but no combs, what is it, what does it transmit?
Xenopsylla cheopsis
Plague
Murine endemic typhus
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?
Schistosomiasis
Reducing morbidity
Only in Asia. 2 terminal nuclei - 2 dots after it ends. Would only be present in the blood at night. Mosquito ???
brugia malayi
mansonia
sheathed microfilaria infection from the bite of a day biting FLY (Chrysops)
Loa Loa
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. ??
W. Bancrofti
which ovum produces eggs that require development in the external environment before becoming infective
Trichuris Trichuria
faeces sample in giardia?
smelly, explosive, greasy, float
which mosquito causes:
Brugia timori
O nyong nyong
Plasmodium falciparum
Wuchereria bancrofti
anopheles
long palps, banded wings
Hard tick - how to tell, what does it transmit?
Tick - hard or soft? Hard if it has a scutum (black part)
Borellia burgdorferi (Lyme)
mosquito transmits yellow fever (obviously), Chikungunya, Dengue, sometimes filariasis, zika
Aedes
which insects cause epidemic typhus (rickettsia prowazekii)?
Body louse
Long siphon, pit latrine - which mosquito and what does it cause?
CuLex
Lymphatic filariasis [Wuchereria bancrofti – nocturnally periodic]
JEV, WNV and Rift Valley Fever
What does sequestration mean?
Adherence of infected erythrocytes to the endothelium of capillaries and venules
Schizont seen. Where does next stage of LC happen?
Mosquito
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:
T. Solium
Entamoeba histolytica can be distinguished from Entamoeba dispar using a?
specific faecal Ag test
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:
Cordylobia - clothes (drying clothes worn by person - then get infected)
