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.
A vale is a long depression in the land, usually between two hills and containing a river. A vale is a valley. If you've ever gone to a place where there are mountains, you've seen plenty of mountain ranges, mountaintops, and valleys. Valleys are the low points between hills, and they are also known as vales.