This Week in Parasitism

TWiP explains a study that carries out selection of Plasmodium falciparum in the presence of inhibitors to identify determinants of drug resistance, and a paleoparasitological analysis of a 5th–16th c. CE latrine. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Naegleria fowleri acquired at splash pad (MMWR) Determinants of P. falciparum drug resistance (Science) Paleoparasitological analysis of 5th–16th c. CE latrine (Parasitol) Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

Michelle Labrunda joins TWiP to solve the case of the Georgian in Guinea with fever and dry cough, and describe a new case for you to solve. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Guest: Michelle Labrunda Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Letters read on TWiP 255 New Case A man who is on eculizumab, a recombinant humanized monoclonal antibody that targets complement protein C5 which serves as a terminal complement inhibitor, comes in with left arm swelling. He lives in a city in the north part of the island of Borneo. He is being managed by a doctor in the Malaysian City of Kuching. Now the doctor caring for this man is married to an Infectious Disease expert and she raises concerns that this might be due to a parasitic disease. She is told by the husband that the disease of which she is thinking is not present in the region. She is not swayed and admits him for nightly blood smears which are negative. She then does a rapid immunochromatographic dipstick test that is positive. He lives in a community outside the city and they go to that village and find others with limb swelling issues who are also positive on antigen testing. He is treated with an antibiotic, not antiparasitic for 4 weeks and the arm improves. Hint: this is not Wuchereria Bancrofti. Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

TWiP explains a study which finds that tissue spaces are reservoirs of antigenic diversity for Trypanosoma brucei, then remembers our departed colleague Dickson Despommier. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Click arrow to play Download TWiP #254 (88 MB .mp3, 61 minutes) Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Tissue spaces are reservoirs of antigenic diversity for T. brucei (Nature) Understanding trypanosome antigenic variation (Emerg Top Life Sci) Tissue resident T. brucei (PLoS Path) Hero – Dickson Despommier Despommier Photo Art Parasitology Course (YouTube) Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees TWiP explains a study which finds that tissue spaces are reservoirs of antigenic diversity for Trypanosoma brucei, then remembers our departed colleague Dickson Despommier. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Tissue spaces are reservoirs of antigenic diversity for T. brucei (Nature) Understanding trypanosome antigenic variation (Emerg Top Life Sci) Tissue resident T. brucei (PLoS Path) Hero – Dickson Despommier Despommier Photo Art Parasitology Course (YouTube) Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

TWiP solves the case of the man with somnolence and something extra-erythrocytic, and presents a new puzzle for you to solve. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Letters read on TWiP 253 New Case 26-year-old female with no past medical history. Patient is from Georgia in the US and is volunteering in Hérico, Guinea (town in the Lélouma Prefecture in the Labé Region of northern-central Guinea). She arrived in Guinea in December 2023. She was taking doxycycline for malaria prophylaxis and says that she has not missed any doses On October 2024 she presented with fever and dry cough. Lab work was done and follow up planned for the following day. The patient slept poorly, was febrile to 104 and had ongoing cough. The next day she went to the hospital and was evaluated in the ER for acute febrile illness of unclear etiology. In the hospital, VS were 97.9F, BP 105/70, P 94 Oxy sat 98%, normal physical exam. She was started on Augmentin and Coartem. Pause here to think about the differential at this point and maybe some more history and what testing you might want WBC 14, Hb 13, HCT 40, PLT 285, Neut abs 8, Eos Abso0.80; BUN/creat normal, AST normal; ALT 44, GGT 125 Stool parasite screen + for some sort of eggs, malaria smear negative, CXR with b/l infiltrates She was given a medication (vomited 30 min after dose received). She then received a second dose of medication 5 hours after the first) and was discharged. The following day the patient returned to the ER, stating that she felt worse. Her temperature had climbed to 104 overnight, and she developed watery diarrhea and nausea. There were no additional episodes of vomiting. She was given an additional dose of a medication, ibuprofen, and started on ceftriaxone 1 gm IV Q12 hrs. During the day she continued to have low grade fevers and developed abdominal pain. That night she was again febrile to 104 F. She remained admitted for 5 days with ongoing symptoms of diarrhea, nighttime fevers and diffuse abdominal discomfort. Three more malaria tests were negative (rapid test and slide review) Blood cultures collected – no growth She continued to have mild elevation of WBC and slight elevation of AST and ALT. The patient was transferred to a different hospital. They give her a different medication, and within 24 hours symptoms resolve. What is the diagnosis and what happened here with management? Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

TWiP discusses a study of the safety and immunogenicity of a late liver-stage attenuated malaria parasite delivered by mosquito bite. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Live attenuated malaria vaccine (NEJM) Plasmodium metabolism during hepatic development (Cell) Heroes – Jimmy and Rosallyn Carter, and the Carter Center The Carter Center Guinea Worm Eradication Programme Guinea Worm data visualisations (Our World in Data) Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

TWiP solves the case of the woman who went to Belize and notices a lesion on her face, and presents a new clinical case for you to solve. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Letters read on TWiP 251 New Case Recent case, Arusha hospital, 1800 m, 28 yo comes in, has been visiting game parks. Developing fevers, malaise, bad headaches, body aches, somnolent. Blood smears negative, no malaria. Repeat blood smear, see something extra-erythrocytic. This gives them the diagnosis. HIV neg, no toxic habits, no history. Symptom onset about a week ago. Rest of family is ok. Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

TWiP reviews a study showing that the gut microbiota is essential for suppression of colitis by Trichinella spiralis. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Gut bacteria and Trichinella suppression of colitis (PLoS NTD) Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

TWiP solves the case of the middle-aged man with eosinophilia and a history of sexual activity with paid sex workers in Okinawa, and presents a new case for you to solve. Hosts: Vincent Racaniello, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Letters read on TWiP 249 New Case Woman in 30s or 40s goes to Belize and after returning notices a lesion on her face. She goes to see several physicians and despite a number of topical creams the ulcer on her face does not heal. She is then referred to our office where a certain parasitic infection is considered and we involve our friends at Columbia to help us with the diagnosis.. Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

TWiP reviews the observation that infection of Azlheimer's disease mice with Toxoplasma gondii reduces brain amyloid density globally and regionally. Hosts: Vincent Racaniello, Dickson Despommier, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Toxoplasma reduces amyloid in brain (J Inf Dis) Hero: Theodor Hiepe (Parasitol Res) Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees

TWiP solves the case of the Manhattan man with pain on urination or ejaculation, and presents a new case for you to solve. Hosts: Vincent Racaniello, Dickson Despommier, Daniel Griffin, and Christina Naula Subscribe (free): Apple Podcasts, Google Podcasts, RSS, email Links for this episode Join the MicrobeTV Discord server Hero: Charles Louis Alphonse Laveran Letters read on TWiP 247 New Case A middle-aged male is referred to evaluation because of eosinophilia. This man is married, living here in the NY tristate area, and this was picked up on 'routine blood work' by his primary care doctor. This man had been in the military, serving as a marine, with time spent in Okinawa, Japan. This individual does report sexual activity with paid sex workers while in Okinawa but has been monogamous with his current wife for many years. A number of investigations are done with a test coming back showing serological evidence of a prior parasitic infection and he was treated with an antiparasitic medicine with resolution of the eosinophilia. The eosinophilia returned and he was referred to us. Blood work is now down showing evidence of a viral infection that might explain why the eosinophilia returned after treatment. Pt is HIV negative. This was prior to the COVID-19 pandemic. He is on no medications and in general feels fine. Become a patron of TWiP Send your questions and comments to twip@microbe.tv Music by Ronald Jenkees