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Parasitic life cycles in relation to human infection

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Using the life cycle, environmental factors and risk factors, what interventions will help prevent human infection with the following parasites: Echinococcus granulosus, Toxoplasma gondii, and Trichinella spiralis?

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Hello there,

I'm happy to provide you with a brief overview for this posting. Please be aware that I am not able to complete your assignment for you, but I feel the points and links included in my answer below will help you compose a complete answer. Feel free to augment any section with the level of detail that you see fit.

Echinococcus granulosus

Life cycle:

- Echinococcus granulosus is a parasite that flourishes primarily in canids (the definitive host), such as dogs, wolves and foxes. Within canids, the particular location of E. granulosus infection is the small intestine.
- Adult E. granulosus tapeworms produce eggs which are transported to the environment via the infected canid's feces. From this point, it is possible that E. granulosus can parasitize intermediate hosts (such as livestock and humans) that come in contact with the fecal matter.
- The organs of host livestock that are ingested by canids complete the life cycle of E. granulosus
- within intermediate hosts E. granulosus may cause hydatid disease

Environmental and Risk factors

- coexistence with dogs has been found to increase risk of hydatidosis significantly. Additionally, the number of dogs present in a household/farm and the number of years they have been kept all increase risk of E. granulosus induced hydatid disease
- the restrictions placed on the ...

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Symbiotic Relationship

Symbiotic Relationships. See attached file for full problem description.

Symbiotic Relationship Handout
Laboratory 33
1. What is symbiosis?

2. Describe these types of symbiotic relationships.
A. mutualism
B. commensalism
C. parasitism
3. Complete the following describing these types of symbiosis.

Mutualistic Relationship Organisms Involved Interaction of organisms involved
Root Nodules



Ants and Acacia

4. Complete the table describing these types of commensalism.

Mutualistic Relationships Organisms Involved Interaction of the organisms involved


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5. Complete the table describing types of parasitism found in the textbook.
Name of Parasite
Common name/
Scientific Name Phylum of Parasite Method of transmission Intermediate Host Attacks what organ?
Description of Life Cycle


Image A

1. Name of organism and phylum of each
2. Method of transmission
3. Type of symbiosis
4. Is there an intermediate host?
5. Scientific name
6. Head region called
7. Sections called
8. Symptoms

Image B

1. Names of organisms involved and phylum of each
2. Affect of each organism
3. Type of symbiosis
4. Name of organism in nodules
5. Process undergoing in nodules

Image C

1. Name of organism and phylum
2. Found in what organism
3. Found where
4. How it benefits other organism
5. How the other organism benefit it
6. Type of symbiosis

Image D

1. Organisms involved and phylum of each
2. How each is affected
3. Type of symbiosis
Image E

1. Organisms involved
2. How each is affected
3. Type of symbiosis
4. Phyla involved
Image F

1. Organisms involved and phylum of each
2. Symptoms
3. Mode of transmission

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