Strongyloides stercoralis hyperinfection: Researchers identify chemical that suppresses parasite

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UT Southwestern Clinic scientific study has identified a compound that suppresses the lethal type of a parasitic infection brought on by roundworms that affects as much as 100 million people in most cases causes only mild signs and symptoms.

“The approach we used might be applied generally to the nematode parasite, not only that one type,” stated Dr. David Mangelsdorf, Chair of Pharmacology, an Investigator within the esteemed Howard Hughes Medical Institute (HHMI), and 1 of 3 corresponding authors from the study printed today in the Proceedings from the Nas. The study’s other corresponding authors are in two universities in Philadelphia.


“The plan’s to build up better compounds that mimic the Δ7-dafachronic acidity utilized in this research and finally to deal with the location of stop parasitic infection,” he added.

The Cdc and Prevention (CDC) reports the soil-dwelling Strongyloides stercoralis nematode, or roundworm, may be the primary strongyloides species that infects humans. Experts estimate that between $ 30 million and 100 million individuals are infected worldwide, and many of them are not aware from it as their signs and symptoms are extremely mild. The parasite can persist for many years in your body due to the nematode’s unique capability to reinfect the host, frequently studying the initial phases of their existence cycle. The nematode that triggers the initial infection exists in dirt on all continents except Antarctica, which is most typical in warmer regions, particularly remote rural areas within the tropics and subtropics where walking barefoot coupled with poor sanitation results in infection.

However, in individuals with compromised natural defenses – for example individuals using lengthy-term steroids for bronchial asthma, joint discomfort, or after a body organ transplant – the mild type of the condition can progress towards the potentially lethal form, a scenario known as hyperinfection. Reports say that mortality from untreated hyperinfection is often as high as 87 percent.

The Planet Health Organization reports that even though the parasitic illness has almost disappeared in countries where sanitation has improved, children remain especially vulnerable in endemic regions because of their elevated connection with dirt. Further, the drug of preference, ivermectin, is unavailable in certain affected countries.

“Ivermectin can be used to deal with the condition but is less efficient within the lethal type of the problem,Inches stated Dr. Mangelsdorf, a Professor of Pharmacology and Biochemistry. “We don’t know how the glucocorticoid [steroid] causes hyperinfection, but when it will, ivermectin far less effective, prompting the quest for new drugs. The brand new drug we utilized in our mouse model seems to be really effective,” he stated.

To review the still unknown pathogenesis from the disease, they created a mouse model susceptible fully selection of infection through the human parasite. Because rodents with intact natural defenses are resistant against S. stercoralis infection, they started by having an immunocompromised strain of rodents, after which uncovered some to some synthetic steroid known as methylprednisolone (MPA) that’s generally accustomed to treat bronchial asthma in humans.

The rodents were then uncovered towards the parasitic worms. In contrast to untreated rodents, individuals that received the steroid demonstrated a tenfold rise in the amount of parasitic female worms along with a 50 % rise in mortality, stated Dr. Mangelsdorf, who holds both Alfred G. Gilman Distinguished Chair in Pharmacology and also the Raymond and Ellen Willie Distinguished Chair in Molecular Neuropharmacology in Recognition of Harold B. Crasilneck, Ph.D.

Additionally, third-stage larvae – the existence cycle stage where the worms can initiate hyperinfection – put together in greater figures within the steroid-treated versus untreated rodents, he added.

“Strikingly, treatment having a steroid hormone known as Δ7-dafachronic acidity, a compound that binds to some parasite nuclear receptor known as Ss-DAF-12, considerably reduced the earthworm burden in MPA-treated rodents,” Dr. Mangelsdorf stated. The Ss-DAF-12 receptor matches an identical receptor within the lengthy-studied C. elegans earthworm.

Dr. Mangelsdorf and colleagues formerly demonstrated (PNAS, 2009) the DAF-12 receptor path can be found in many parasitic species. Additionally they demonstrated that activating the receptor with Δ7-dafachronic acidity could override the parasite’s development and stop S. stercoralis from becoming infectious.

“Overall, this latest study supplies a helpful mouse model for S. stercoralis autoinfection and opens the potential of new chemotherapy for hyperinfection by individuals parasite’s own steroid hormone mechanism,” Dr. Mangelsdorf stated.


Four Roundworms: Ascaris, whipworm, hookworm and pinworm

Within this special Thanksgiving airing from the Outbreak News Now Radio Show, I feature four interviews on four common parasitic nematodes, or roundworms– the enormous intestinal roundworm–Ascaris lumbricoides, Trichuris trichiura or whipworm, the hookworms and Enterobius vermicularis, or even the pinworm.

They are tracks from interviews I’ve had with parasitologist and author, Rosemary oil Drisdelle.

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The Outbreak News Now Radio Show, the foremost and only radio program dedicated to infectious disease and health news and information, airs weekly at 8 pm ET in the Tampa San francisco bay area on AM 1380 The Biz and online at

Subscribe, listen, follow and comment on the podcasts at iTunes and Stitcher Radio

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Parasites 101: Whipworm

On today’s podcast, my special expert guest, Parasitology teacher and author of Parasites: Tales of Humanity’s Most Unwelcome Visitors, Rosemary oil Drisdelle and I continue our consider the great realm of human parasites staying with the intestinal nematodes–Trichuris trichiura or whipworm.

Combined with the other soil-transmitted helminths we’ve discussed, hookworms, and Ascaris lumbricoides, they infect more than 1.5 billion people globally, or 24% from the world’s population, comprising a significant burden of disease worldwide.

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  • Dientamoeba fragilis: ‘The unflagellated human flagellate’
  • Lymphatic filariasis in Nigeria: The fight from the disfiguring parasitic disease
  • Parasites 101: Pinworms
  • Parasites 101: Entamoeba histolytica
  • Diphyllobothrium: The biggest known tapeworms that may infect people
  • Parasites 101: Swimmer’s itch
  • Parasites 101: Cyclospora
  • Coyote tapeworm in Alberta: fifth human situation reported
  • Raccoon roundworm: The rare and potentially lethal zoonosis
  • McGill researchers uncover there are three genetically distinct categories of whipworms
  • Chewable parasite drug, EMVERM, available these days for treatment pinworm, others
  • Gnathostomiasis recognized as reason for Australian teen’s illness years after infection

This is a close view of the intestinal mucosa in the case of a patient who’d been infested with the human whip worm, Trichuris trichiura Image/CDCThis can be a close look at the intestinal mucosa within the situation of the patient who’d been infested using the human whip earthworm, Trichuris trichiura

Intro music: “Rapture” by Ross Bugden

Gnathostomiasis recognized as reason for Australian teen’s illness years after infection

An Australian teen was lately identified as having a parasitic infection that they contracted some six years back, based on a Yahoo Australia news report today.


Based on the report, Carly Goff contracted the then unknown parasite after eating undercooked fish during visit to Fiji. The parasite was lately recognized as the parasitic nematode, Gnathostoma.

Based on the Cdc and Prevention (CDC):

Human gnathostomiasis is because several types of parasitic worms (nematodes) within the genus Gnathostoma. The condition is located and it is most generally diagnosed in Southeast Asia, although it has additionally been found elsewhere in Asia, in South and Guatemala, as well as in some regions of Africa. People become infected mainly when you eat undercooked or raw freshwater fish, eels, frogs, wild birds, and reptiles. The most typical manifestations from the infection in humans are migratory swellings underneath the skin and elevated amounts of eosinophils within the bloodstream. Rarely, the parasite can enter other tissues like the liver, and also the eye, leading to vision loss or blindness, and also the nerves, spinal-cord, or brain, leading to nerve discomfort, paralysis, coma and dying.

LISTEN: Rebecca A. Cole, PhD, Parasitologist using the US Geological Survey’s National Wildlife Health Center discusses the current study concerning Gnathostomes in Asian swamp eels within the US 

Gnathostomiasis is given antiparasitic medications. Within the two several weeks because the diagnosis, Carly’s been given earthworm tablets which starve the parasite, and she or he is finally on the path to a healthy body, the report notes.