In Infectious Disease Puscast #87, Drs. Daniel Griffin and Sarah Dong review recent literature focusing on viral, bacterial, parasitic diseases, and vaccines. Key discussions include the surprising cardiovascular benefits of the recombinant zoster vaccine, the non-inferiority of dalbavancin for complicated Staphylococcus aureus bacteremia, and the critical importance of timely antibiotic therapy for Stenotrophomonas maltophilia pneumonia. They also highlight the utility of PCR in detecting primary syphilis infections missed by serology, and present an oral antibiotic alternative for early syphilis during current penicillin shortages. Furthermore, the episode addresses the increasing length of the Babesia season due to climate change, new findings on ivermectin's dual role in malaria control, and the significantly higher effectiveness of high-dose flu vaccines in older adults for reducing hospitalizations and mortality.
Summarizing Infectious Disease Puscast #87
1:30 Shingles Vaccine & Cardiovascular Health: A study shows that the adjuvanted recombinant zoster vaccine (RZV) not only prevents herpes zoster ophthalmicus (73% reduction) but is also associated with a lower risk of acute myocardial infarction (28% reduction) and stroke (42% reduction) in adults aged 50 and older.
5:21 Dalbavancin for Staph Bacteremia: The DOTS randomized clinical trial found that dalbavancin was not superior to standard therapy for complicated Staphylococcus aureus bacteremia based on a "desirability of outcome ranking" (DOOR) at day 70, but it did meet non-inferiority criteria for clinical efficacy (73% vs. 72%). The hosts discuss that the DOOR endpoint might not fully capture practical benefits like reduced IV access time and hospital stays.
13:39 Timely Antibiotics for Pneumonia: A retrospective cohort study on Stenotrophomonas maltophilia pneumonia demonstrates that timely antibiotic therapy (within 48 hours of culture collection) significantly improved patient outcomes, leading to a 22.8% absolute reduction in 30-day mortality and a 50% reduced death hazard.
16:57 Primary Syphilis Detection: A systematic review and meta-analysis revealed that 10% of Treponema pallidum PCR-positive primary syphilis infections were seronegative at initial presentation, emphasizing the importance of PCR for early detection.
19:14 Oral Option for Early Syphilis: A randomized controlled trial comparing Cefixime (oral, 14 days) to Benzathine Penicillin G for early syphilis showed that while Cefixime had a lower serologic response at 3 months (73% vs. 87%), it achieved comparable rates at 12 months (93% vs. 96.8%), suggesting it could be a viable alternative, especially during penicillin shortages.
23:55 Lengthening Babesia Season: A retrospective cohort study in New England documented a significant expansion of the Babesia season over 31 years, with an increase of 0.33 months per year and a 14% annual growth in cases, primarily due to climate change.
26:27 Ivermectin for Malaria Control: A cluster-randomized trial in Kenya found that ivermectin, administered monthly for three consecutive months, resulted in a 26% lower incidence of malaria infection than albendazole. The discussion suggests ivermectin's efficacy is likely due to its dual action: killing both malaria parasites and mosquitoes that feed on treated individuals.
29:34 High-Dose Flu Shots for Seniors: A post-hoc analysis of the DANFLU-1 trial showed that high-dose influenza vaccines for adults aged 65-79 were associated with a significantly lower risk of first and recurrent hospitalizations for pneumonia and influenza, and a 74% reduction in all-cause mortality, regardless of the patient's frailty score.