Strongyloides stercoralis description. The parasitic nematode is infectious to humans and has a unique feature – both parasitic and free-living generations. Although prevalent almost worldwide, except only in the far north and south, the global burden of this parasitic infection is still underestimated because of the unavailability of precise data from endemic areas. It was identified by Baray in 1876. However, in some cases, it can lead to serious health complications, especially in immunocompromised individuals. The parasite is unique in that it has both parasite and free living form Habitat: The parasite females live in the mucus membrane of small intestine of human especially in the duodenum and jejunum. The parasite is also known as threadworm causing infection with fecal contamination of soil or water. Estimates of the human infection burden range from 30–100 million people, primarily in tropical and subtropical areas of sub-Saharan Africa, Southeast Asia and South America [1]. An estimated 614 million people are infected worldwide. stercoralis infection is frequently underdiagnosed. Because many cases are asymptomatic and sensitive diagnostic methods are lacking, S. These tiny worms are parasitic in nature and can infect humans and other animals. Its common name in the US is threadworm. In the Strongyloides stercoralis is an intestinal nematode capable of causing disseminated, fulminant, and even fatal infections in some immunocompromised patients, in particular those receiving corticosteroids. It is a human pathogenic parasite which causes disease, known as strongyloidiasis. Strongyloidiasis occurs in warm, moist areas such as the subtropics and tropics, and in rural areas of the southern United States. stercoralis infections in humans was in 1876, when soldiers returning from the region that is now Vietnam began suffering from severe diarrhea (Bavay, 1877). stercoralis is capable of Jul 1, 2016 · Colon nontumor - Strongyloides stercoralisStrongyloides filariform larvae in fecally contaminated ground penetrate skin, enter the systemic circulation and migrate to the lungs where they induce inflammation They climb the tracheobronchial tree and are swallowed In the intestines they mature into adult worms Eggs (made by mature worms) hatch in the intestines and release rhabditiform larvae Strongyloides stercoralis is a roundworm. Strongyloidiasis is one of the major infections that are transmitted via contaminated soil. Here is an introduction to Strongyloides: Life Cycle: The life cycle of Strongyloides involves both free-living and parasitic stages. The increasing incidence of autoimmune and wasting diseases and increased use of immunosuppressive agents, as well as the increased Apr 8, 2019 · Strongyloides stercoralis Strongyloides stercoralis is commonly known as dwarf threadworm. . [1] S. In the free-living cycle: Rhabditiform larvae are passed in the stool of an infected definitive host , develop into either infective filariform larvae (direct development) or free-living adult males and females that mate and produce eggs , from which Sep 4, 2023 · Strongyloides stercoralis, commonly known as threadworm, is a soil-transmitted human parasite belonging to a group of nematodes called roundworms. Strongyloidiasis is an infection caused by the soil-transmitted helminth Strongyloides stercoralis, capable of completing its life cycle within the human host. Findings Apr 1, 2025 · Strongyloides stercoralis is an important soil-transmitted helminth occurring world-wide and affecting 30–100 million people. 61,62 Humans are transcutaneously infected through contact with contaminated soil; filariform larvae migrate to the small intestine, where the female larvae reside and lay eggs. The Strongyloides stercoralis, commonly known as the human threadworm, is a skin-penetrating gastrointestinal parasitic nematode that infects hundreds of millions of people worldwide. It is commonly called a threadworm in the US. The adult parasitic stage lives in tunnels in Strongyloides stercoralis By Jason Hallman Geographic Range Habitat Physical Description Development Reproduction Behavior Communication and Perception Food Habits Predation Ecosystem Roles Economic Importance for Humans: Positive Economic Importance for Humans: Negative Conservation Status Other Comments Contributors References The first description of S. Findings include abdominal pain and diarrhea, rash, pulmonary symptoms (including cough and wheezing), and eosinophilia. Rhabditiform Strongyloidiasis is an intestinal infection caused by 2 species of the parasitic nematode Strongyloides. Jun 16, 2025 · Definition / general Nematode helminth (roundworm) parasites that settle in the small intestine and cause infection in humans Infection most commonly caused by Strongyloides stercoralis and less often by zoonotic species like Strongyloides fuelleborni (Clin Microbiol Rev 2023;36:e0003323) Jul 26, 2022 · Strongyloides stercoralis is a nematode parasite which belongs to the family Strongylidae under order Rhabditida. stercoralis, therefore Strongyloides stercoralis is a human pathogenic parasitic roundworm causing the disease strongyloidiasis. The lifecycle of Strongyloides stercoralis is unique, as it can reproduce Jul 1, 2023 · Strongyloides is a genus of parasitic nematodes (roundworms) that includes the species Strongyloides stercoralis, commonly known as the human threadworm or threadworm. Like other Strongyloides species, S. It is rare in developed countries while in the developing countries, it is more invasive in rural . Treatment is with ivermectin or albendazole. Feb 16, 2022 · Strongyloides stercoralis is a parasitic roundworm that causes strongyloidiasis. Jun 13, 2020 · Strongyloidiasis is infection with the nematode (worm) Strongyloides stercoralis. The most common and clinically important pathogenic species in humans is S stercoralis (see the following image). This parasite can live in the human body for many years, often without causing symptoms. Diagnosis is by finding larvae in stool or in the small intestine or occasionally in sputum or by detection of antibodies in blood. Mar 11, 2023 · Strongyloides stercoralis, commonly known as the dwarf threadworm, is the causative agent of strongyloidiasis. [2] The Strongyloides stercoralis nematode can parasitize humans. Introduction and basic biology Organismal biology and significance to human health Strongyloides stercoralis is a significant human pathogen and also a parasite of dogs. In the UK and Australia, however, the term threadworm can also refer to nematodes of the genus Enterobius, otherwise known as pinworms. It is the smallest nematode known to cause infection in humans. The Strongyloides stercoralis life cycle is complex, alternating between free-living and parasitic cycles and involving autoinfection. Apr 25, 2025 · What is Strongyloidiasis? Strongyloidiasis is an infection caused by the parasitic roundworm Strongyloides stercoralis.
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