Which of the following features have not helped Giardia become the most common intestinal parasite?
A) A tough cyst form that resists chlorine disinfection used for municipal water treatment, UV light, and freezing.
B) Ingesting as few as 10 cysts is sufficient to establish infection.
C) It can be transmitted via fecal-oral route, via contaminated fomites, or from direct contact with an infected patient.
D) No drugs are currently available for treatment.
E) It lives in animals other than humans.
Answer: A
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What will be an ideal response?