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.
The Central Valley (also called the Great Central Valley) is a very large valley in the middle of California, in the United States. About 42,000 square miles (108,779 square kilometers) in size, it is about the size of the state of Tennessee.It consists of two connected, differently named valleys, the Sacramento Valley and the San Joaquin Valley.bout 42,000 square miles (108,779 square kilometers) in size, it is about the size of the state of Tennessee. It consists of two connected, differently named valleys, the Sacramento Valley and the San Joaquin Valley.