What are the two diagnostic forms of Giardia?

What are the two diagnostic forms of Giardia?

• A. Cysts and trophozoites
• B. Merozoites and schizonts
• C. Oocysts and sporocysts
• D. Ova and L3 larvae

Answer: (A)

Two diagnostic forms of Giardia are cysts and trophozoites. The cyst is a hardy, environmentally resistant stage that is shed in feces and is the form most often detected in routine stool exams because it survives outside the host. The trophozoite is the active, motile stage that inhabits the small intestine and is typically seen in fresh diarrheic stool or during duodenal sampling. Diagnostic tests target either cysts or trophozoites to confirm infection, with cysts being more commonly identified due to their durability. The other terms refer to life-cycle stages of different parasites and are not used to diagnose Giardia.

Two diagnostic forms of Giardia are cysts and trophozoites. The cyst is a hardy, environmentally resistant stage that is shed in feces and is the form most often detected in routine stool exams because it survives outside the host. The trophozoite is the active, motile stage that inhabits the small intestine and is typically seen in fresh diarrheic stool or during duodenal sampling. Diagnostic tests target either cysts or trophozoites to confirm infection, with cysts being more commonly identified due to their durability. The other terms refer to life-cycle stages of different parasites and are not used to diagnose Giardia.