Children are most commonly infected. Estimated prevalence rates among children in various world regions are 4â28%. Ascariasis: Ascaris, or roundworm, infection is the common helminthic infection in humans, with an estimated worldwide prevalence of 1 billion. The causative organism, A lumbricoides, is cosmopolitan in distribution, being most abundant in tropical countries.
Definition of hollow. 1  1 : an unfilled space : cavity, hole in the hollow of a tree. 2  2 : a depressed or low part of a surface; especially : a small valley or basin.
They are all different sizes: 1  hamlets are are tiny settlements - they are just a collection of houses, perhaps centered around a few farms and maybe without even a shop;  villages are small settlements - several hundred people live in them and they have: a few shops, a place of worship and maybe a school too;