Question

1) Protists can cause significant problems for travelers. Research one such protist and create an informational poster (to be displayed in a travel or medical centre) advising people about this organism. Ensure you include methods of contraction (i.e. water, food, spa tools), means to prevent infection, (non medical), treatments (those to be taken before/during travel as well as those that one would take should they contract the illness), and prognosis (should one become infected). (20 marks) Marking Rubric on following page

SBI3C - Biology Lesson 7 Key Question #7 Protists can cause significant problems for travelers. Research one such protist and create an informational poster (to be displayed in a travel or medical centre) advising people about this organism. Ensure you include methods of contraction (ie, water, food, spa tools), means to prevent infection, (non medical), treatments (those to be taken before/during travel as well as those that one would take should they contract the illness), and prognosis (should one become infected). (20 marks) Marking Rubric on following page. 2. The kingdom Protista has been described as a collection of misfits. Write a short paragraph on the meaning and accuracy of this statement. (10 marks) An amoeba reproduces by binary fission about once ever 24 h. How many amoebae would be produced from an original cell in a month of 30 days, assuming all survived and reproduced? (2 marks) A peregrine falcon in Washington State was diagnosed with malaria. It was thought to be an isolated case until the disease was discovered in other birds of prey. How do suppose malaria was transmitted to the falcon? What implications could this have on humans? (5 marks)

Answer 1

protist is any eukaryotic organism (cells containing a nucleus) that is not an animal, plant, or fungus. Some protist do resemble like plants and animal rather than other protist.

The word "protist pathogen" may be used to denote any disease-causing microbe that is not bacteria, virus, viroid, prion, or metazoa.

Examples of protists include:

• Amoeba
• Choanaflagellates
• Ciliates
• Diatoms
• Giardia
• Plasmodium (causes malaria)
• Phytophthora (cause of the Irish potato famine)
• Slime molds

Here we will research about the most common protist "Amoeba i. e. Entamoeba histolytica" Which causes "Ameobiasis Or amoebic dysentry".

Entamoeba histolytica is an anaerobic parasitic protozoan which infect humans and other primates causing amoebiasis. It can present with no, mild or severe symptoms.

Histolytica means " Tissue destroyer"

It causes a disease known as "Amoebiasis"

The E. Histolytica exists in two forms, a cyst stage (the infective form) and a trophozoite stage (the form that causes invasive disease). Cysts are typically found in formed stool, whereas trophozoites are typically found in diarrheal stool. Both of them are passed in feces.

Infection occurs by ingestion of mature cysts in fecally contaminated food, water, or hands. The incubation period may ranges from a few days to several months or years, commonly 2-4 weeks. Transmission can also occur through exposure to fecal matter during

• sexual contact Or
• contaminated food,
• water or other objects.

Prevention and Control

1. Educate the general public and asymptomatic carriers in personal hygiene, particularly the sanitar disposal of feces and hand washing after defecation, and before preparing or eating food.
2. Education high-risk groups to avoid sexual practices that facilitate fecal-oral transmission.
3. Dispose of human feces in a sanitary manner and do not use as fertilizer.
4. Protect public water supplies from fecal contamination.
5. Providing adequate drugs supply for treating asymptomatic carriers to reduce the transmission risk.
6. sanitary practices of people who prepare and serve food in public
7. During acute illness, use enteric precautions in the handling of feces, contaminated clothing and bed linen.
8. Confirmed cases should refrain from using recreational water venues until treatment with a luminal drug is completed and any diarrhea has resolved.

Prognosis.

Amebiasis generally responds well to treatment and should clear up in about 2 weeks.

When the condition is treated, the prognosis is good, but in some parts of the world, recurrent infections are common. The mortality rates after treatment are less than 1%.

If amebiasis is left untreated, however, it can be deadly.