Roundworms

Definition

Roundworms, also known as nematodes, are cylindrical helminths that infect various tissues of the host. They can cause significant gastrointestinal and systemic diseases in humans.

5 Must Know Facts For Your Next Test

1. Roundworms are eukaryotic parasites that often have complex life cycles requiring multiple hosts.
2. Common human-infecting roundworms include Ascaris lumbricoides and Enterobius vermicularis (pinworm).
3. Infections typically occur through ingestion of contaminated food or water containing roundworm eggs or larvae.
4. Symptoms of roundworm infections can range from mild gastrointestinal discomfort to severe complications like intestinal blockage and malnutrition.
5. Laboratory diagnosis often involves microscopic examination of stool samples to identify eggs or larvae.

Review Questions

• What are the primary modes of transmission for roundworm infections?
• Name two common species of roundworms that infect humans and describe one symptom associated with each.
• How are roundworm infections typically diagnosed in a laboratory setting?

Related terms

Helminth: A general term for parasitic worms, including flatworms and roundworms.

Virulence Factors: Molecules produced by pathogens, including helminths, that promote their ability to cause disease.

Ascaris lumbricoides: A species of parasitic roundworm known for causing ascariasis in humans.