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This Week in Parasitism

twip reboot

This Week in Parasitism (TWiP) is a podcast about eukaryotic parasites started by Vincent Racaniello and Dick Despommier. Daniel Griffin, MD joined the team in January 2015 and added not only his expertise in infectious diseases, but began a new feature of TWiP, the case study. Each week Daniel presents the symptoms and signs of an interesting case that he has investigated during his work, without identifying the infectious agent. Listeners are encouraged to send in their guesses to this weekly infectious disease mystery. We call this new change 'TWiP reboot'.

The TWiP trio strives for an informal yet informative conversation about parasites which is accessible to everyone, no matter what their science background. As science Professors at Columbia University, Dickson and Vincent have directed research laboratories focused on parasites and viruses. Their enthusiasm for teaching inspired them to reach beyond the classroom with new media. TWiP is for everyone who wants to learn about parasites in a relaxing way.

Music used on TWiP is composed and performed by Ronald Jenkees and used with permission.

 

TWiP 101: Is it round or is it flat?

The doctors TWiP solve the case of the Woman with White Worms, and explore the role of a secreted growth factor from a carcinogenic parasite in wound healing and angiogenesis.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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 Download TWiP #101 (84 MB .mp3, 111 minutes)

Subscribe to TWiP (free) in iTunes, by the RSS feed or by email

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Listener Pick

Ramon - Ancient Rome was infested with parasites

Case study for TWiP 101

This week's case involves an uncommon parasite. Young girl, <10 y, brought in by parents from rural area to regional hospital with fever, diarrhea for 2 weeks. No blood in stool. Parents: few weeks prior to problems, young girls went with family on wild pig hunting trip. With guns. Girl did consume pig on trip, all meat was very well cooked. Was involved with preparation of meat with Mother only. No one else got sick. No surgery, no allergies. Both parents have diabetes. Has four brothers. Some weight loss. This is outside the US. Physical exam: low grade fever, diffuse mild abdominal discomfort, slight microcytic anemia, size of cells is slightly smaller than normal. WBC: normal, except no eosinophils. Blood cultures negative. Stool examination is where we get our answer.

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TWiP 100: Driving past a milestone

The TWiP trifecta solves the case of the Woman from Bolivia with Belly Pain, and discuss a method for population modification of malaria mosquitoes using a Cas9-mediated driver gene.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Download TWiP #100 (85 MB .mp3, 113 minutes)

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Case study for TWiP 100

This week's case is a 27 yo female, native NY, referred to outpatient at CU after seeing OBGYN, told had seen worms in stool and underwear. Inch or two in length, pale white, round, moving, 2-3 weeks of constant abdominal bloating. Sexually active. No particular diet. Travel: works for NGO, refugee camp in Ethiopian-Sudan border, southern Sudan. Last visit month ago. Noticed worms when she got back from last trip. Eats what local people eat. Raw food popular there: kitfo, raw steak tartare, with melted butter. Made from local beef. Did not take malaria prophylaxis, did not avoid local water, does wear sandals. College graduate. Nothing remarkable in family. CBC, liver, metabolic: all normal. Stool not normal: loose, no mucus or blood.

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TWiP 99: You get your polar bear from your nana

The TWiP trifecta solves the case of the Professor Who Went to Brazil, and discuss an amazing case of a tapeworm that turned into a tumor in an AIDS patient.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Download TWiP #99 (72 MB .mp3, 100 minutes).

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Case study for TWiP 99

This week's case is a 53 yo woman visiting family in US, comes in with intense belly pain, right upper part of belly. Has become strict vegetarian after having breast cancer, on raw vegetable diet (carrots, collect plants in local markets). From Bolivia. Lives in agricultural area, avoids sheep, fearful of dogs. Housekeeper. Married, lives with husband. Noticed pain when came to US. Breast cancer: localized, removed lesion, no therapy, months ago. No allergies, family healthy. No insect bites, lives in concrete house. Physical exam: not febrile, right upper quadrant is very tender, some liver enlargement. CBC: 10,000 white count, mostly eosinophils, liver function: AST, ALT, AlkPhos all normal. Neuro exam: normal. Five months before this diet, she did have normal diet. Some meat, drank milk.

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TWiP is a MicrobeTV production

 

TWiP 98: Resistance is not futile

The TWiP-lets reveal Balamuthia infection in the Children from Peru, and discuss resistance to pyrethroids uncovered by RNA sequencing of Anopheles mosquitoes.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Download TWiP #98 (70 MB .mp3, 97 minutes).

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Case study for TWiP 98

This week's case is a Professor clinician, teacher, researcher.  In his 50s, he presents with lesion on big toe, anterior portion, tip, nodular. No surrounding redness, area is itchy. Has a small central black area the size of pencil tip, concerned because feels is getting larger over last week. Spooky. Travels, last in Brasil, had been for a few weeks, noticed toe issue a week after returned. Spent time on beach, but wore flip flops. Different types of beaches, crowded and not crowded. Went with wife. Healthy man, no prior medical problems.

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TWiP 97: The seven year itch

The paratenic hosts reveal a case of scabies in the Traveling Salesman, and discuss a role for natural antibody in protection from infection with Plasmodium.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Case study for TWiP 97

Daniel has two cases this week. Two people with similar presentations. A 12 yo girl in Peru presented for care with painless dark brown area on right knee. Has brothers and sisters, often play together. No trauma, but area is expanding. Months later develops cognitive changes. Second case is a 5 yo boy from the coastal region of Peru brought in by Mother, has red swollen area on face. Mom says while playing scratched nose, swelling right cheek, eye, nasal obstruction, no response to antibiotics. MRI of both show infiltrating process. Girl, left side of brain, middle cerebral artery territory. Boy in frontal region, midline area. Thus both skin lesions associated with infiltrating process in brain. Came into clinic months after lesions started, and lesions still present.

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TWiP 96: Salivary pharmacopeia

The TWiPanosomes solve the case about the Young Woman who Went to Belize, and relate how sandfly saliva skews the immune response and increases risk of cutaneous leishmaniasis.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Case study for TWiP 96

Daniel's patient for this week is male patient referred for consultation by OB-GYN: his wife is pregnant, has been admitted and is about the give birth. It is her first pregnancy. There are concerns about the husband's skin problem and whether it is a threat to his pregnant wife. No lesions on woman, husband recently developed itchy skin problem on his hands. Bilateral. Small papules on webs of fingers, brown lines, blood clots at ends, has clearly scratched the lesions. Skin between fingers is involved. Travels, often stays in cheap hotels. Beds not clean. Last trip 1 month before symptoms.  Midwest travel. Family history of heart disease. Sales occupation. No animal exposure. Travels to medium to large cities. 

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TWiP 95: Arsenic and Leishmania

Vincent, Dickson, and Daniel solve the case about the 33 year old Chinese male with watery diarrhea, and discuss whether arsenic in drinking water might lead to treatment failures for Leishmania infections.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Download TWiP #95 (77 MB .mp3, 105 minutes).

Links for this episode:leishmania - leishmania tropica.jpgd15978d9-81d0-42c7-839b-d32b1550f31dOriginal

This episode is sponsored by ASMGAP.

Case study for TWiP 95

Daniel's patient for this week is a 28 yo single female, returns from beach vacation with new boyfriend. Two weeks in Central America (Belize). Often found secluded beaches. Good health, noticed upon her return had small nodules/papules on front of thighs. Thought were insect bites, became very itchy. Noticed serpiginous red lines forming, radiating out from bumps. Felt things moving in her skin. Benadryl did not help. Daniel say something similar occurs in Lima. Healthy, no allergies, surgeries, no relevant family history, using barrier contraception, sexually active. Only drinks alcohol socially. Boyfriend did not report symptoms. She did lie on sand, used thin fabric. Stayed in hotel. There were wild dogs on beach. During her stay she ate ceviche. No intestinal symptoms.

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TWiP 94: Loa hanging fruit

Vincent, Dickson, and Daniel solve the case about the man from El Salvador, and discuss the use of tyrosine kinase inhibitors to treat onchocerciasis and filariasis.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Download TWiP #94 (74 MB .mp3, 102 minutes).

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Case study for TWiP 94

Daniel's patient was seen in the clinic. He is a 33 yo chinese male, from Chinatown NYC, for several months on and off has had watery diarrhea, headaches. Tried reflexology, chiropractic therapy, with no results. Has traveled quite a bit, been in Chile (was there a few months before). Came to US when young. Grew up in the US. In Chile, has had many sexual partners, >50, of both sexes, also has done many drugs. Two years ago was diagnosed with chronic HIV, CD4 count 685, on ARVs triple therapy, virus loads are well controlled. Has had syphilis, nose job, no medication allergies. Lives with family. On exam, afebrile, looks well. Symptom onset a few months after last Chile visit. Is an adventurous eater.

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TWiP 93: A fishy tale unfolds

 Vincent, Dickson, and Daniel solve their fishy tale, and present a new case study for your consumption.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Case study for TWiP 93

April 2015 a 177 lb 5ft10in 39 yo man seen as outpatient in ID clinic, reports 2 y ago had issues with constipation on and off; throat hurts; feels closing when lies down. For several years has had skin irritation on upper chest and arms. Tried to donate blood, was rejected, told to see doctor.

Emigrated to US from El Salvador 2002, married, reports no extramarital sex, smokes 2-3 cigs/day, now quit; had drinking issue in past, no more; was agricultural worker in rural part of El Salvador; has history of asthma, on a number of medicines, including steriod nasal spray, inhaler, no visual problems, healthy appearing, not allergic to medicines. Family history: mother heart attack and diabetes; father peptic ulcer disease.

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TWiP 92: Kleptohaemodeipnonism

Vincent, Dickson, and Daniel discuss how fluctuation in the price of guinea pig food could help transmission of the agent of Chagas disease, and present a new case study for your consumption.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Download TWiP #92 (73 MB .mp3, 100 minutes).

Links for this episode:ascaris adults

  • Ascaris on TWiP 21
  • Ascaris lumbricoides life cycle (jpg)
  • Child with distended abdomen due to Ascaris (jpg)
  • Bottlenecks and Chagas disease (Proc Biol Soc)
  • Letters read on TWiP 92

Case study for TWiP 92

A 20 yo Japanese female student went to the emergency room with severe abdominal pain. nausea, had vomited. Had just enjoyed homemade sushi an hour or two previuosly. She prepared the sushi: rice, salmon, tuna rolls. Salmon was local, caught by boyfriend. Tuna from store, sushi grade. No past medical history, mother with anemia. Takes oral contraceptives. No toxic habits. No travel. Monogamous. Temp 100.2, bp 140/90, hr high 90s, breathing upper teens. Physical exam normal except appears distressed in pain, belly extended, tender in left upper quadrant. Friends ate sushi but no one else got sick. All guests ate both types of fish.

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