There may be as many as 300,000 species of parasites affecting vertebrates, and as many as 300 affecting humans alone.

Helminths of importance in the sanitation field are the human parasites, and are classified as Nemathelminthes (nematodes) and Platyhelminthes, depending on whether they possess a round or flattened body, respectively.

Ringworm (dermatophytosis) is actually caused

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