▁ ▁Mor ph ology ▁▁ ▁As car is ▁lum br ico ides ▁is ▁character ized ▁by ▁its ▁great ▁size . ▁M ales ▁are ▁ ▁in ▁diameter ▁and ▁ ▁long . ▁The ▁male ' s ▁posterior ▁end ▁is ▁cur ved ▁vent r ally ▁and ▁has ▁a ▁bl unt ly ▁pointed ▁tail . ▁Fem ales ▁are ▁ ▁wide ▁and ▁ ▁long . ▁The ▁vul va ▁is ▁located ▁in ▁the ▁anterior ▁end ▁and ▁accounts ▁for ▁about ▁one - third ▁of ▁its ▁body ▁length . ▁U ter i ▁may ▁contain ▁up ▁to ▁ 2 7 ▁million ▁eggs ▁at ▁a ▁time , ▁with ▁ 2 0 0 , 0 0 0 ▁being ▁laid ▁per ▁day . ▁F ert il ized ▁eggs ▁are ▁o val ▁to ▁round ▁in ▁shape ▁and ▁are ▁ ▁long ▁and ▁ ▁wide ▁with ▁a ▁thick ▁outer ▁shell . ▁Un fer til ized ▁eggs ▁measure ▁ ▁long ▁and ▁ ▁wide . ▁ ▁Ep ide mi ology ▁ ▁An ▁estimated ▁ 1 ▁billion ▁people ▁are ▁inf ected ▁with ▁A . ▁lum br ico ides ▁world wide . ▁While ▁in fection ▁occurs ▁throughout ▁most ▁of ▁the ▁world , ▁A . ▁lum br ico ides ▁in fection ▁is ▁most ▁common ▁in ▁sub - S ah aran ▁Africa , ▁the ▁Amer icas , ▁China , ▁and ▁east ▁Asia . ▁Although ▁the ▁pre val ence ▁is ▁low ▁in ▁the ▁United ▁States , ▁the ▁in fection ▁still ▁exists ▁in ▁sout he astern ▁part ▁of ▁the ▁United ▁States ▁due ▁to ▁its ▁temperature ▁and ▁hum id ▁climate . ▁ ▁As car is ▁lum br