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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 105: Survival of the fattest

The TWiPanosomes solve the case of the Young Man from Anchorage, and discuss how cestode parasites increase the resistance of brine shrimp to arsenic toxicity.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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Links for this episode:journal.ppat.1005459.g001

Case study for TWiP 105

This week's case involves a 32 yo male with several concerns. Spent 6 weeks doing religious missionary work in Kenya, performed baptisms in Lake Victoria.Waist deep in water, no shoes. Took malaria drugs, ate lots of interesting foods: cichlids, ugali, corn based food, flavored with greens; stew with some sort of meat, beef and goat. Five weeks after return developed rash with fever, shortness of breath. Three of four friends who were with him in Kenya reported similar symptoms. The fourth who did not get sick did not go in water, nor did he eat very much. No medical/surgical history, no drugs. Had some sexual activity while there. Elevated white count, 70% eosinophils. Chest CT shows nodules in lungs. Doc told him, allergy, you will be fine. The water he went into is near a village, there are rodents nearby, and a runoff.

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TWiP 104: La maladie du sommeil

Michael returns to help the TWiP trio solve the case of the Delusional African Expatriate, who then discuss the association of natural and induced antibodies in mice with differential susceptibility to secondary cystic echinococcosis.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

Guest: Michael Libman

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Download TWiP #104 (78 MB .mp3, 102 minutes)

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Links for this episode:Screenshot 2016-02-27 08.55.13

 Case study for TWiP 104

This week's case involves a young man in his thirties, admitted in hospital in Anchorage AK in early June. Chief complaint, severe muscle pain and tenderness. Usually healthy guy, 1 week ago had bad case of diarrhea with belly pain and vomiting, lasted a full week. Now has fever. Concerned because wife now is having diarrhea. Unremarkable history, unknown family history. HIV negative. All childhood vaccinations. Does not eat raw meat. No meds, does seasonal work, social drinker. Came back from successful hunt, got a black bear. Dressed in field, cooked at home really well. Wife also ate bear meat. Bear meat is in freezer. No vegetables. Also eats salmon which he caught the previous season, then frozen. Drinks water from the stream when he hunts. Physical exam: hot, 38.5, bp 115/75, pulse 105, breathing comfortably. Anxious, swelling around both eyes. Sclera not noted. Labs: WBC elevated 14,000, 30% eosinophils; chemistries fine; muscle enzymes LDH, CK elevated.

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TWiP 103: Scroll down, please

The TWiP-scholars solve the case of the Housewife from Kolkata, discuss mutations in the IL17 gene associated with cerebral malaria, and hear a case presentation from guest Michael Libman.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

Guest: Michael Libman

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 Case study for TWiP 103

This week's case concerns a 42 yo male, refugee in Canada, from DRC, former Zaire, where there is unending civil war. Upper middle class, professor of French at university. Had been imprisoned, tortured, lived in jungle for a few years, reached refugee camp in Tanzania, moved to Canada. Came to health care system 15 months after arrived. Was sent to psych, unstable emotionally, delusions, hallucinations, depression, post traumatic issues. Was under psych care for ~1 yr, did not improve, became worse. Sent to hospital. History: talked about having minor injury, hurt lower back, pain there bothering him. Some anemia (normochromic), basic hem/chem/urine/liver nothing remarkable. Physical exam, nothing remarkable. HIV negative. Some evidence for chronic inflammatory condition: sed rate 60 (elevated), had diffuse increase in IgG, IgM. Developed some low level autoantibodies; anti-nuclear, p-anka, anti-neutrophil cytoplasmic antibodies. Slightly elevated fever for a few days, then few days or week with no fever. No eosinophilia. Radiology: on CT did have some mediastinal, aortic, axillae lymphadenopathy. Prob screened in Africa for malaria and treated; prob also got ivermectin. Also got head MRI: not completely normal, classic nonspecific midbrain abnormality. Diffuse mild edema. Weight loss not remarkable. No visual problems.

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TWiP 102: Nursing eosinophils

The TWiPyzoites solve the case of the Uncommon Parasite, and discuss the role of eosinophils in promoting the growth of Trichinella in skeletal muscle.

Hosts: Vincent RacanielloDickson Despommier, and Daniel Griffin

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 Case study for TWiP 102

This week's case involves a 24 yo housewife, from a village outside of Calcutta. Comes into a tertiary care hosp, 6 months coughing up blood, fever, no weight loss. Drinks rainwater, milks her cow. Dogs everywhere, no livestock except cows. Eats meat, well cooked. No extramarital encounters. Husband well. 4 children. Cistern for drinking water is covered.  No health issues. Reports salty, clear mucus. No blood in stool, no changes in stool. Exam: looks healthy, lungs clear. Lab tests: White count of 9000, 12% eosinophils (elevated). So she has eosinophilia. Chest X-ray and CT: lesion on left side in xray. CT: shows 4 cm cavity, with air pocket on left side, mid-lung. HIV negative. Dusty soil, birds.

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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)

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Links for this episode:Opisthorchis viverrini 3

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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Links for this episode:Screenshot 2016-01-09 11.56.31

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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Links for this episode:H nana adultF

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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Links for this episode:Balamuthiatrop

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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