In Infectious Disease Puscast #84, hosts Daniel Griffin and Sara Dong review recent infectious disease literature. The episode highlights the success and patient preference for long-acting HIV treatment (Cabotegravir + Rilpivirine) in real-world settings due to improved satisfaction and reduced treatment burden. It also uncovers significant gaps in healthcare provider knowledge regarding West Nile Virus diagnostic testing. Discussions cover the systemic spread patterns of Staphylococcus aureus bacteremia and delve into Clostridioides difficile infection (CDI) management, including the effectiveness of fecal microbiota transplantation (FMT) and challenges clinicians face in adhering to new guidelines due to cost and availability of preferred treatments. Rare and interesting cases are presented, such as donor-derived tuberculosis in transplant recipients, zoonotic infections from a brown bear, and a botulism outbreak from home-canned cactus. The hosts also explore factors influencing outcomes in prosthetic joint infections, including the unexpected benefit of Amphotericin B for fungal cases. Finally, the episode touches on the pricing of neglected tropical disease therapies and provides practical tips for ID case presentations. A critical analysis of USAID's global health impact underscores its significant role in preventing millions of deaths and warns against the catastrophic consequences of defunding.
Infectious Disease Puscast #84: A Deep Dive into Recent ID Literature
Details: An observational, real-world study of 308 adults initiating long-acting Cabotegravir + Rilpivirine for HIV-1.
Key Takeaway: 97% of participants maintained viral suppression (<50 copies/mL) at 12 months, and 97% preferred the long-acting injectable over daily oral therapy due to reduced treatment fatigue, adherence anxiety, and convenience. Patient-reported challenges related to HIV treatment (e.g., fear of disclosure, stigma) significantly decreased.
4:45 West Nile Virus (WNV) Diagnostic Testing Knowledge Gap:
Details: A 2022 US survey of 1,502 healthcare providers revealed that only about 25% ordered the correct diagnostic tests for WNV.
Key Takeaway: Providers need a refresher on WNV testing protocols, which include IgM antibody on serum, PCR for immunocompromised or neurological symptoms (CSF IgM and PCR), and confirmatory plaque reduction neutralization tests for severe cases, with no role for IgG in acute diagnosis.
Details: A study analyzing the risk and distribution of metastatic infections from primary infection foci.
Key Takeaway: A visually striking "alluvial" figure demonstrates how primary Staph aureus infection sites can lead to various metastatic locations, with lungs and bones being frequent secondary sites. This helps clinicians understand the patterns of spread.
8:46Clostridioides difficile (CDI) Management with FMT:
Details: A real-world cohort study of 1,170 CDI patients receiving 1,643 FMT treatments via capsules, colonoscopy, or nasojejunal tube.
Key Takeaway: FMT resulted in a 60% cure rate after the first treatment, increasing to 81% after repeated FMT. Prolonged antibiotic pre-treatment improved cure rates by 20%. Repeated FMT was more effective than antibiotics alone for initial failures, regardless of administration method.
Details: A 2024 survey of ID physicians on their management preferences for CDI, compared to 2021 IDSA/SHIA guidelines recommending fidaxomicin over vancomycin for initial and recurrent CDI, and bezlotoximab as a co-intervention for recurrent cases.
Key Takeaway: Despite guideline recommendations, significant barriers like high costs, insurance challenges, and limited availability of fidaxomicin and bezlotoximab impact clinical decision-making and adherence, often forcing reliance on vancomycin.
15:32 Donor-Derived Tuberculosis (TB) in Organ Transplants:
Details: Report of three cases of donor-derived TB in kidney and liver recipients from the same donor, presenting with unexplained fevers 4-5 weeks post-transplant.
Key Takeaway: Donor-derived TB should be considered in solid organ transplant recipients with unexplained fever in the first few months post-transplant (typically 2-3 months), differing from reactivation TB which usually presents much later. Graft involvement can be a key indicator.
Details: Case of septic arthritis and osteomyelitis in a hunter's finger caused by Mycoplasma phocimorsus after skinning a brown bear in Alaska.
Key Takeaway: For treatment-refractory cases with exposure to seals, cats, or bears, consider empiric doxycycline or moxifloxacin while awaiting molecular diagnostic results.
19:52 Foodborne Botulism Outbreak from Home-Canned Cactus:
Details: An outbreak of eight botulism cases in California linked to improperly home-canned prickly pear cactus (nopales).
Key Takeaway: Home canning of low-acid foods requires proper sterilization with a pressure caner, not just boiling water, to prevent Clostridium botulinum growth. All patients recovered due to timely antitoxin administration, but experienced significant morbidity.
23:26 High Reinfection Rates in Polymicrobial Hip Arthroplasty:
Details: The largest study (65 patients) on one-stage revision for polymicrobial periprosthetic joint infection (PJI) in total hip arthroplasty.
Key Takeaway: Nearly one in three patients (33%) experienced septic failure at midterm follow-up, with most reinfections caused by the same initial organisms, highlighting the challenges of managing polymicrobial PJI with a single-stage approach.
Details: Discovery of 4,000-year-old Mycobacterium lepromatosis genomes from archaeological sites in Chile.
Key Takeaway: This provides the oldest evidence of Hansen's disease in the Americas, indicating a long and previously undocumented history of the infection, and also aiding understanding of animal reservoirs like armadillos and squirrels.
Details: A systematic review and meta-analysis of Candida prosthetic joint infections (CPJI).
Key Takeaway: Co-infection with Staphylococcus aureus and retention of the prosthesis were strong predictors of treatment failure. First-line therapy with amphotericin B was associated with a more than tripling of success likelihood, likely due to its superior in vitro antibiofilm activity compared to triazoles.
Details: Retrospective analysis of pricing and availability for 11 NTD treatment products in the US (2019-2024).
Key Takeaway: While albendazole prices decreased significantly, mebendazole prices rose, and miltefosine remains extremely expensive (~$48,000 per course). Limited manufacturers contribute to vulnerability to shortages.
Details: Discussion of an article providing 10 practical tips for successful ID case presentations.
Key Takeaway: It's a valuable resource for new fellows. Strong case conferences don't always require rare "zebras"; discussing "bread and butter" topics can be highly effective and provide lasting value.
Details: A retrospective chart review comparing outcomes of periodic in-person ID care to daily tele-ID care at a community hospital.
Key Takeaway: Daily tele-ID care patients were sicker but had shorter lengths of stay, were less likely to be discharged on IV antibiotics, and more frequently discharged on oral antibiotics, with no significant differences in transfer rates or mortality. A higher 30-day readmission rate for tele-ID was noted but only one was ID-related.
36:05 Impact of USAID Global Health Interventions:
Details: A Lancet analysis evaluating the impact of two decades of USAID funding and projecting the effects of defunding on mortality until 2030.
Key Takeaway: USAID programs prevented over 91 million global deaths (30 million children) and significantly reduced mortality from HIV/AIDS, malaria, and NTDs, by both direct health programs and improving social determinants of health. Projected funding cuts could lead to over 14 million additional deaths by 2030, described as a "conscious and avoidable policy choice" akin to a global pandemic in scale.