Medical Microbiology

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How do protozoa adapt to harsh environmental conditions?
Protozoa adapt to harsh conditions by developing into a cyst form that is less metabolically active. This cyst is surrounded by a thick external cell wall capable of protecting the organism from otherwise lethal physical and chemical insults.
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Which morphologic form is important in the transmission of protozoa from host to host?
The cyst form.
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How do helminths such as schistosomes avoid the host immune response?
Alteration of the antigenic properties of their external surfaces. This is accomplished in part by incorporating host antigens into their external cuticular layer.
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What are the most common modes of entry of parasites into the human host?
The most common modes of entry are oral ingestion or direct penetration through the skin or other surfaces
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Name two factors that determine the outcome of the interaction between parasite and host.
Two important factors that determine the outcome of the interaction between parasite and host are the route of exposure and inoculum size.
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Name three pathologic mechanisms thought to be important in parasitic diseases.
Three broad pathologic mechanisms in parasitic diseases are (1) the production of toxic parasite products, (2) mechanical tissue damage, and (3) immunopathologic reactions of the host
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Other cards in this set

Card 2

Front

Which morphologic form is important in the transmission of protozoa from host to host?

Back

The cyst form.

Card 3

Front

How do helminths such as schistosomes avoid the host immune response?

Back

Preview of the front of card 3

Card 4

Front

What are the most common modes of entry of parasites into the human host?

Back

Preview of the front of card 4

Card 5

Front

Name two factors that determine the outcome of the interaction between parasite and host.

Back

Preview of the front of card 5
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