Which larval stage of ascaris is infective?

The infective larval stage of Ascaris lumbricoides, a type of roundworm, is the third-stage larva (L3). This larva develops within the eggs after they are laid and must undergo a process of maturation in the environment, usually in soil, to become infective. Once ingested by a host, the eggs hatch in the intestines, releasing the larvae that can then migrate through the body.