Virulence and pathogenicity of parasites Flashcards Preview

RUSVM PID Exam#1 (Orange semester Fall 2016) > Virulence and pathogenicity of parasites > Flashcards

Flashcards in Virulence and pathogenicity of parasites Deck (43)
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1

3 groups of eukaryotic organisms that aflict health and wellbeing of animals?

1. Protozoa
2. Helminths
3. Arthropods

2

single celled, nucleated org that causes harm to health?

Protozoa

3

worm like animals showing differentiation, metazoans

Helminths

4

3 sub classifications of helminths and short description

Nematode-round worm
Cestode- tapeworm (flat words)
Trematode- fluke (flatworm)

5

Arachnids and insects, ectoparasites that afflict health and well being of animals?

Arthropods (Entomology)

6

Lives on the host, causes infestations?

Ectoparasite

7

Lives in the host, causes infection?

Endoparasite

8

harbors adult or sexual stage of the parasite?

Definitive host

9

harbors larval or asexual stage of the parasite?

Intermediate host

10

an unusual host, unnecessary for the maintenance of parasite in nature?

Incidental host

11

conferred by a host's specific immune response developed as a result of a previous parasitic infection?

Acquired immunity

12

resistance to reinfection or superinfection conferred by presence of parasites that are alive but are in check by host immunity-malaria, toxoplasmosis

Premunition

13

Parasites have specificity for?

particular definitive and intermediate hosts

14

Often parasite life cycles can only be completed in?

a particular host

15

How can disease manifestations differ?

Depends upon whether an animal serves as a definitive, intermediate, or incidental host.

16

infection dose and the number of organisms acquired over time?

Severity

17

Ingestion cause of parasite infection?

Giardia, Balantidium coli, Toxoplasma gondii, Cryptosporidium, Cestodes, some Nematodes, some Trematodes

18

Skin or mucosal penetration cause of parasite infection?

Hookworm, Strongyloides stercoralis; schistosomes

19

Transplacental (prenatal) cause of parasite infection?

Toxoplasma gondii, Toxocara canis, Strongyloides stercoralis

20

Transmammary (milk) cause of parasite infection?

Toxocara canis, T. cati, Ancylosotma caninum

21

Arthropod bite (vector) cause of parasite infection?

Babesia, heartworm, Leishmania, Trypanosomes

22

Sexual contact: cause of parasite infection?

Tritrichomonas foetus

23

How does the parasites reproduce in protozoa?

Multiply in Hosts

24

How do helminths reproduce?

Adult worms do not multiply in the definitive host. Worms die over time, unless the host is re-exposed

The severity of the disease is proportional to worm load introduced into the host.

25

Attachment of parasites causes?

Cell and tissue damage

26

Different mechanical or biting mouthparts?

Oral cavity
Attachment organs
Suction disc
direct penetration

27

Ancylostoma tubaeforme have what kind of attachment?

3 pairs of teeth in buccal cavity

28

Adult hookworms in the small intestine of infected dogs or cats are attached to the intestinal villi by?

Large mouth cavity (buccal cavity)

-Adult hook worms can cause loss of .2 mL of blood per day

29

Taenia spp. scolex (T. solium and T. saginata) attach to this area in humans?

small intestine

30

Attach to villi of small intestine

Giardia intestinalis