Which of the following statements regarding Giardia spp. is FALSE?
A.Giardia is a single-celled protozoan parasite.
B.The infective form of Giardia in the environment is called a sporozoite.
C.Giardia has the potential to produce bloody, watery, mucoid diarrhea in the primary hosts.
D.The infective form of Giardia is very resistant in the environment and can survive for great lengths of time.
Answer A is true: protozoan parasites are, by nature, single-celled.
Answer C is also true: in addition to the diarrhea described in the answer, Giardia can cause fever, nausea, swollen abdomen & abdominal pain and vomiting in its host animal (including humans!)
Answer D is true as well: the infective form of Giardia can survive for months in cold water. It is generally 7-14 days from the time the host is infected to the time symptoms show up, and then the symptoms can last anywhere from 2-4 weeks. Since Giardia is microscopic, it is very difficult to get rid of.
That leaves Answer B as the false answer: a sporozite is the spore formed after the fertilization of an apicomplexan parasite. The active (infective) stage of protozoan parasites is called trophozoite.