Textbook Question
Cryptosporidium cannot be killed by routine boiling. Another parasite resistant to such boiling is __________.
a. Giardia
b. Trypanosoma
c. Toxoplasma
d. Plasmodium
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21. Principles of Disease
Characteristics of Infectious Disease
2:11 minutesProblem 17
Textbook Question
Which of the following is most effective in preventing infection by Giardia? __________
a. Sexual abstinence
b. Drinking only bottled water
c. Use of insect repellent
d. Cooking all food
Verified step by step guidance1
Step 1: Understand the nature of Giardia. Giardia is a protozoan parasite that causes giardiasis, an intestinal infection typically transmitted through contaminated water or food.
Step 2: Identify the common routes of Giardia transmission. The parasite is often spread by ingesting cysts from contaminated water sources, such as untreated or poorly treated drinking water.
Step 3: Evaluate each option in terms of preventing Giardia infection: (a) Sexual abstinence does not directly prevent Giardia since it is not primarily sexually transmitted; (b) Drinking only bottled water reduces the risk of ingesting contaminated water, which is a common source of Giardia; (c) Use of insect repellent is irrelevant because Giardia is not transmitted by insects; (d) Cooking all food can kill many pathogens, but Giardia cysts are more commonly associated with water than food.
Step 4: Conclude that the most effective prevention method among the options is to avoid drinking contaminated water, which is best achieved by drinking only bottled water or properly treated water.
Step 5: Therefore, the best choice is the option that directly addresses the main transmission route of Giardia, which is drinking only bottled water.
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Transmission of Giardia
Giardia is a protozoan parasite transmitted primarily through ingestion of contaminated water or food containing cysts. Understanding its transmission routes helps identify effective prevention methods, focusing on water safety and hygiene.
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Waterborne Parasite Prevention
Preventing Giardia infection involves avoiding contaminated water sources. Drinking bottled or properly treated water reduces exposure to Giardia cysts, which are resistant to some common disinfection methods but can be removed by filtration or boiling.
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Ineffectiveness of Other Measures
Measures like sexual abstinence, insect repellent use, or cooking food do not effectively prevent Giardia infection because the parasite is not transmitted sexually or by insects, and cooking food is less relevant since waterborne cysts are the main source.
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