Roundworm is a parasitic condition which is seen to commonly affect dogs. The worms can enter the body due to accidental exposure to water bodies which have been infected by roundworm eggs. The egg then hatches inside the body and the emergent worm attaches itself to various vital body organs, thus, feeding on them for its growth and propagation.
There are two species of hookworms that usually infect humans. They are called Ancylostoma duodenale and Necator americanus. They infect adults and children. These species are mainly found in the tropical and subtropical regions.