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.
3. any depression or hollow resembling a valley. 4. a low point or interval in any process, representation, or situation. 5. any place, period, or situation that is filled with fear, gloom, or the like: the valley of despair. 6. a depression or angle formed by the meeting of two inclined sides of a roof.