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.
Basin vs Valley. A basin is a depression or hollow on the earthâs surface, which is surrounded by higher land. A valley is also a depression or hollow between hills, mountains and uplands. A basin, which is also called a watershed, is the part of land that is drained by a river and its various tributaries.Creeks and streams are the characteristics of a basin, which helps in the draining of the water that falls on the surface into a river, which is then carried into the ocean.asin vs Valley. A basin is a depression or hollow on the earthâs surface, which is surrounded by higher land. A valley is also a depression or hollow between hills, mountains and uplands. A basin, which is also called a watershed, is the part of land that is drained by a river and its various tributaries.