The infective stage of which parasite is an egg containing a larva, a free-living larva, or a larva within an intermediate host or transport host?

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The infective stage of nematodes can be an egg containing a larva, a free-living larva, or a larva within an intermediate host or transport host. Protozoa do not have an infective stage that includes an egg or larva. Trematodes and cestodes have complex life cycles involving multiple stages and hosts, but their infective stages typically involve larvae within intermediate hosts or transmitted through environmental sources such as water or soil.

The Infective Stage of Which Parasite Is an Egg Containing