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 valley is an elongated lowland between ranges of mountains, hills, or other uplands, often having a river or stream running along the bottom; also an extensive area of land drained or irrigated by a river system.Canyons have steep, cliff-like walls or sides, while valleys have gently sloping sides.ifference between a mountain and a valley? already exists. already exists as an alternate of this question. exists and is an alternate of. You studied communications and law in college. Have you used anything you learned through college in your professional career as a poker player? What is the difference between valley and canyon? What is the ...