▁pul mon ary ▁circul ation . ▁They ▁then ▁break ▁out ▁of ▁the ▁cap ill aries ▁and ▁enter ▁the ▁air ▁spaces . ▁Ac ute ▁t issue ▁reaction ▁occurs ▁when ▁several ▁w orm s ▁get ▁lost ▁during ▁this ▁migration ▁and ▁accum ulate ▁in ▁other ▁org ans ▁of ▁the ▁body . ▁The ▁ju ven iles ▁migr ate ▁from ▁the ▁lung ▁up ▁the ▁resp ir atory ▁tract ▁to ▁the ▁ph ary nx ▁where ▁they ▁are ▁sw allowed . ▁They ▁begin ▁producing ▁eggs ▁within ▁ 6 0 – 6 5 ▁days ▁of ▁being ▁sw allowed . ▁These ▁are ▁produced ▁within ▁the ▁small ▁int est ine , ▁where ▁the ▁ju ven iles ▁m ature . ▁It ▁might ▁seem ▁odd ▁that ▁the ▁w orm s ▁end ▁up ▁in ▁the ▁same ▁place ▁where ▁they ▁began . ▁One ▁hypothesis ▁to ▁account ▁for ▁this ▁behavior ▁is ▁that ▁the ▁migration ▁m im ics ▁an ▁intermediate ▁host , ▁which ▁would ▁be ▁required ▁for ▁ju ven iles ▁of ▁an ▁ancest ral ▁form ▁to ▁develop ▁to ▁the ▁third ▁stage . ▁Another ▁possibility ▁is ▁that ▁t issue ▁migration ▁enables ▁faster ▁growth ▁and ▁larger ▁size , ▁which ▁increases ▁re product ive ▁capacity . ▁ ▁History ▁ ▁Gi ant ▁int est inal ▁round w orm s ▁have ▁been ▁known ▁since ▁anti qu ity . ▁In ▁ 1 7 5 8 ▁Lin na eus ▁named ▁them ▁As car is ▁lum br ico ides . ▁For ▁many ▁centuries , ▁they ▁were ▁thought ▁to ▁arise ▁by ▁sp ont aneous ▁generation . ▁In ▁ 1 8 5 5 , ▁ ▁As car is ▁eggs