▁ 5 3   µ m ▁in ▁width . ▁E gg s ▁are ▁shed ▁from ▁the ▁host ▁at ▁the ▁ 8 – ▁to ▁ 1 6 - cell ▁stage ▁and ▁h atch ▁in ▁the ▁environment , ▁roughly ▁ 2 4 ▁hours ▁after ▁passing ▁through ▁the ▁host . ▁L 1 ▁lar va e ▁emer ge ▁from ▁the ▁egg ▁and ▁measure ▁from ▁ 3 0 0 – 6 0 0   µ m ▁in ▁length . ▁Three ▁lip - like ▁structures ▁can ▁be ▁seen ▁around ▁a ▁rud iment ary ▁mouth . ▁L 1 ▁lar va e ▁mou lt ▁to ▁L 2 ▁lar va e ▁after ▁ 2 – 3 ▁days ; ▁they ▁then ▁begin ▁feed ing ▁on ▁b acter ia ▁in ▁the ▁environment . ▁The ▁L 1 - stage ▁cut icle ▁ ▁lo os ens ▁from ▁either ▁end ▁of ▁the ▁lar va e , ▁but ▁remain ▁lo os ely ▁associated ▁with ▁the ▁L 2 ▁lar va e , ▁becoming ▁an ▁outer ▁she ath ▁up ▁until ▁in fection . ▁After ▁ 3 ▁days , ▁the ▁L 2 ▁partially ▁m oul ts ▁into ▁ens he athed ▁L 3 , ▁the ▁inf ect ive ▁non feed ing ▁stage . ▁In fect ive ▁lar val ▁stages ▁measure ▁ 4 8 0 – 5 6 3   µ m ▁long . ▁ ▁M ice ▁ing est ▁the ▁L 3 ▁stage ▁of ▁the ▁par as ite ▁and ▁after ▁ 1 8 ▁hours , ▁ex she athed ▁L 3 ▁appears ▁in ▁the ▁int est inal ▁l umen . ▁The ▁L 1 ▁she