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.
1. a hollow or depressed area. 2. a lowering or decrease of functional activity. 3. in psychiatry, a mental state of altered mood characterized by feelings of sadness, despair, and discouragement; distinguished from grief, which is realistic and proportionate to a personal loss.