Helmintos are a group of parasitic worms that can infect various animals, including humans. They belong to two main categories: nematodes (roundworms) and cestodes (flatworms). These organisms often live in the intestines and can cause various health issues, such as malnutrition and digestive problems. Transmission of helmintos typically occurs through contaminated food, water, or soil. Once inside a host, they can reproduce and grow, leading to increased infection severity. Preventive measures include proper hygiene, cooking food thoroughly, and maintaining clean water sources to reduce the risk of infection.