Final answer:
The helminth infection that can be diagnosed using tape is commonly a nematode infection, specifically pinworms. The tape test method is not used for diagnosing cestode, trematode, or fluke infections.
Step-by-step explanation:
Which type of helminth infection can be diagnosed using tape? The correct answer is (a) Cestode infection. This method, often referred to as the "tape test", is typically used to diagnose infections by pinworms, which are a type of nematode, not a cestode. It involves pressing a piece of clear adhesive tape against the perianal skin to collect possible pinworm eggs, which can then be observed under a microscope.
The term 'helminth' is a general term that refers to parasitic worms which include cestodes (tapeworms), nematodes (roundworms, pinworms, hookworms, and whipworms), and trematodes (flukes). Cestodes are characterized by having flat, segmented bodies with a head (scolex) that attaches to the intestinal wall. Nematodes are round-bodied and often have a complete digestive system, while trematodes are typically flat, non-segmented worms that often inhabit certain body organs like the liver or blood vessels.
To clarify the question's options: Trematode infection and Fluke infection refer to the same group of helminths, since flukes are a type of trematode worm.