[Posted 21/Aug/2025]

AUDIENCE: Infectious Disease, Family Medicine

KEY FINDINGS: Authors first revealed the plasma metabolomic characteristics of H7N9 patients and found that a machine-learning model based on plasma metabolites could predict the risk of death for H7N9 in the early stage of admission.

BACKGROUND: Avian influenza such as H7N9 is currently a major global public health risk, and at present, there is a lack of relevant diagnostic and treatment markers.

DETAILS: Authors collected plasma samples from 104 confirmed H7N9 patients, 31 of whom died. Plasma metabolites were detected by UHPLC-HRMS, and a survival prediction model based on metabolites was constructed by machine-learning models. A total of 1536 metabolites were identified in the plasma samples of H7N9 patients, of which 64 metabolites were up-regulated and 35 metabolites were down-regulated in the death group. The enrichment analysis of tryptophan metabolism, porphyrin metabolism, and riboflavin metabolism were significantly up-regulated in the death group. We found that most lipids and lipid–like molecules were down-regulated in the death group, and organoheterocyclic compounds were significantly up-regulated in the death group. A machine-learning model was constructed for predicting mortality based on porphobilinogen, 5-hydroxyindole-3-acetic acid, L-kynurenine, Biliverdin, and D-dimer. The AUC on the test set was 0.929.

Copyright © The Authors. Published by Elsevier Ltd on behalf of International Society for Infectious Diseases. All rights reserved.

Source: Wang, Y., Ni, J., Huanga, M., et al. Metabolomic Profiling of Plasma Reveals Differential Disease Severity Markers in Avian Influenza A(H7N9) Infection Patients. International Journal of Infectious Diseases. 2025; 158: 107957. Published: September, 2025. DOI: 10.1016/j.ijid.2025.107957.

[Posted 28/Aug/2025]

AUDIENCE: Neurology, Pediatric, Neurosurgery

KEY FINDINGS: Infants up to 6 weeks of age with genetically diagnosed SMA who were treated with risdiplam before the development of clinical signs or symptoms appeared to have better functional and survival outcomes at 12 and 24 months than untreated infants in natural history studies. Larger, controlled studies with longer follow-up are needed to further understand the relative efficacy and safety of presymptomatic treatment of SMA with risdiplam.

BACKGROUND: Risdiplam, an oral pre–messenger RNA splicing modifier, is an efficacious treatment for persons with symptomatic spinal muscular atrophy (SMA). The safety and efficacy of risdiplam in presymptomatic disease are unclear.

DETAILS: Authors conducted an open-label study of daily oral risdiplam (with the dose adjusted to 0.2 mg per kilogram of body weight) in infants 1 day (birth) to 42 days of age with genetically diagnosed SMA but without strongly suggestive clinical signs or symptoms. The primary outcome, assessed in infants with two SMN2 copies and a baseline ulnar compound muscle action potential (CMAP) amplitude of at least 1.5 mV, was the ability to sit without support at month 12. Natural history studies have shown that the majority of infants with two SMN2 copies who are untreated would have a severe SMA phenotype (type 1), would never sit independently, would receive permanent ventilation and feeding support, or would die by 13 months of age. Secondary outcomes that were assessed over a period of 24 months included survival, ventilatory support, motor milestones, the development of clinically manifested SMA, feeding, and growth. A total of 26 infants with two, three, or four or more copies of SMN2 were enrolled. After 12 months of treatment, 21 infants (81%) could sit unsupported for 30 seconds, 14 (54%) could stand alone, and 11 (42%) could walk alone. A total of 4 of 5 infants (80%; 95% confidence interval, 28 to 100) with two SMN2 copies and a baseline ulnar CMAP amplitude of at least 1.5 mV were able to sit without support for at least 5 seconds. Three infants were withdrawn from the study by a parent or caregiver after the month 12 visit. Of 23 infants who completed 24 months of treatment, all were alive without the use of permanent ventilation or feeding support. Over a period of 24 months, nine treatment-related adverse events were reported in 7 infants; none of these events were serious.

Copyright © Massachusetts Medical Society. All rights reserved.

Source: Finkel, R. S., Servais, L., Vlodavets, D., et al. (2024). Risdiplam in Presymptomatic Spinal Muscular Atrophy. N Engl J Med. 2025; 393(7): 671-682. Published: August 13, 2025. DOI: 10.1056/NEJMoa2410120.

[Posted 22/Aug/2025]

AUDIENCE: All Healthcare Professionals

KEY FINDINGS:

BACKGROUND: Recurrent Respiratory Papillomatosis (RRP) is a rare and chronic condition caused by human papillomavirus (HPV) types 6 and 11. The disease leads to the formation of benign tumors in the respiratory tract, most often in the larynx, which can cause significant symptoms like voice changes and difficulty breathing. Historically, the primary treatment for RRP has been repeated surgical removal of the tumors, as there have been no approved medical therapies to address the underlying cause.

DETAILS: The U.S. Food and Drug Administration (FDA) has approved Papzimeos (zopapogene imadenovec-drba), a groundbreaking immunotherapy, for the treatment of adult patients with RRP. This therapy is a non-replicating adenoviral vector that works by stimulating a targeted immune response against the HPV-infected cells. It is administered via a subcutaneous injection and represents the first non-surgical therapeutic option for this rare disease, offering a new approach beyond traditional surgical management.

The approval of Papzimeos was based on data from a single-arm, open-label trial. The study demonstrated that 51.4% of patients who received the treatment achieved a complete response, defined as not needing any further surgical intervention for 12 months following the treatment. The clinical benefits were shown to be durable for most patients over a two-year period and correlated with the development of specific T-cells targeting HPV 6 and 11. The therapy had a favorable safety profile with no serious treatment-related adverse events.

Key information:

• First-of-its-kind Approval: Papzimeos is the first approved medical therapy for RRP.
• Novel Mechanism: It is an immunotherapy that targets the root cause of the disease, HPV-infected cells.
• Approval Pathway: The product received Orphan Drug and Breakthrough Therapy designations and was approved under Priority Review, reflecting the significant unmet medical need for RRP patients.

Source: FDA Approves First Immunotherapy for Recurrent Respiratory Papillomatosis. FDA. 2025; Published: August 14, 2025.

Immunogenicity, Safety, and Efficacy of the Vaccine H56:IC31 In Reducing the Rate of Tuberculosis Disease Recurrence In HIV-negative Adults Successfully Treated for Drug-Susceptible Pulmonary Tuberculosis: A Double-Blind, Randomised, Placebo-Controlled, Phase 2b Trial

[Posted 2/Jul/2025]

AUDIENCE: Infectious Disease, Family Medicine

KEY FINDINGS: Vaccination with H56:IC31 at treatment completion for pulmonary tuberculosis did not reduce the risk of recurrent disease. H56:IC31 was well tolerated and immunogenic but might have increased the risk of relapses by endogenous strains.

BACKGROUND: People with tuberculosis who complete treatment remain at risk of recurrent disease. The vaccine H56:IC31 has been shown to be safe and immunogenic in phase 1 and 2 studies, but whether it can reduce the risk of tuberculosis recurrence is unknown.

DETAILS: In a double-blind, randomised, placebo-controlled, phase 2b trial in South Africa (five clinical trial sites) and Tanzania (one clinical trial site), we enrolled participants aged 18-60 years, without HIV, who had completed more than 5 months (22 weeks) of treatment for drug-susceptible pulmonary tuberculosis. During trial screening (<=7 days after starting treatment), two sputum samples were obtained and frozen for later comparison to recurrent isolates by whole-genome sequencing (WGS). Eligible participants were randomly assigned (1:1; block size of four) to receive two intramuscular doses in the deltoid, 56 days apart, of H56:IC31 or placebo. After the first dose of H56:IC31 or placebo, participants were followed up until study day 421 (1 year after the second dose) and checked at each visit for tuberculosis signs and symptoms. If tuberculosis was suspected, two sputum samples were obtained: one sample was tested by automated molecular test (Xpert MTB/RIF Ultra) and sent for liquid culture; and the other sample was stored frozen for later analysis by whole-genome sequencing (WGS). At the last visit (day 421), two sputum samples were obtained from all sputum-productive participants, regardless of symptoms, to detect cases of asymptomatic tuberculosis. The primary endpoint was culture-confirmed recurrent pulmonary tuberculosis (due to relapse with the same strain, reinfection by a different strain, or indeterminate) occuring during the period starting at day 70 (14 days after the second dose) and ending on day 421 (1 year after the second dose). Vaccine efficacy against recurrent tuberculosis was derived from Cox proportional hazards models. Secondary endpoints included vaccine efficacy to prevent tuberculosis relapse or reinfection independently, as differentiated by WGS, and safety and immunogenicity outcomes (H56-specific CD4 T-cell responses and humoral anti-H56 IgG responses). Primary analysis of vaccine efficacy was based on modified intention-to-treat (mITT), in all randomly assigned participants except those with tuberculosis disease recurrence or who withdrew before day 70 (or 14 days after the second dose for those who received both doses). Safety was assessed in all randomly assigned participants who received at least one dose of vaccine or placebo. The trial was registered with ClinicalTrials.gov, NCT03512249, and is complete. 831 participants (mean age 34.7 years [SD 11.1]; 229 [28%] female and 602 [72%] male; 549 [66%] Black) were enrolled from Jan 31, 2019, to Jan 20, 2022; 415 participants were randomly assigned to receive H56:IC31 and 416 to receive placebo. Follow-up was completed by March 20, 2023 (mean follow-up duration 410.1 days [SD 82.8]). In the primary mITT analysis, recurrent tuberculosis occurred in 23 of 400 participants in the H56:IC31 group (12 relapses, eight reinfections, and three indeterminate); and in 14 of 406 in the placebo group (six relapses, seven reinfections, and one indeterminate). Vaccine efficacy for prevention of recurrence was -73.8% (95% CI -246.9 to 9.8; p=0.10). Vaccine efficacy for prevention of relapse was -116.1% (-522.2 to 16.3; p=0.11) and for prevention of reinfection was -21.1% (-245.3 to 56.5; p=0.71). 2 weeks after the planned second dose, H56:IC31 had significantly increased the frequencies of H56-specific CD4 T cells expressing interferon-γ, tumour necrosis factor, interleukin (IL)-2, or IL-17 in vaccinees (median percentage of CD4 T cells, 0.35% [IQR 0.19 to 0.57]) compared with placebo (0.11% [0.09 to 0.23]; p < 0.0001). H56-specific IgG responses were significantly higher in H56:IC31 recipients (median arbitrary units per mL, 6.84 [IQR 1.64 to 32.8]) than in placebo recipients (1.94 [1.05 to 3.86]; p < 0.0001). A greater proportion of H56:IC31 recipients had mild-to-moderate injection site reactions than placebo recipients (165 [40%] of 415 vs 78 [19%] of 416). No treatment-related serious adverse events were reported. Two participants who received H56:IC31 and six who received placebo died.

Copyright © Elsevier Ltd. All rights reserved.

Source: Borges, A. H., Russell, M., Tait, D., et al. Immunogenicity, Safety, and Efficacy of the Vaccine H56:IC31 In Reducing the Rate of Tuberculosis Disease Recurrence In HIV-negative Adults Successfully Treated for Drug-Susceptible Pulmonary Tuberculosis: A Double-Blind, Randomised, Placebo-Controlled, Phase 2b Trial. The Lancet Infectious Diseases. 2025; 25(7): 751-763. Published: July, 2025. DOI: 10.1016/S1473-3099(24)00814-4.

[Posted 6/Nov/2024]

AUDIENCE: Gastroenterology, Infectious Disease, Internal Medicine

KEY FINDINGS: The results show that CRISPR-Cas13b can be programmed to specifically target and degrade HBV RNAs to reduce HBV replication and protein expression, demonstrating its potential as a novel therapeutic option for chronic HBV infection.

BACKGROUND: New antiviral approaches that target multiple aspects of the HBV replication cycle to improve rates of functional cure are urgently required. HBV RNA represents a novel therapeutic target. Here, we programmed CRISPR-Cas13b endonuclease to specifically target the HBV pregenomic RNA and viral mRNAs in a novel approach to reduce HBV replication and protein expression.

DETAILS: Cas13b CRISPR RNAs (crRNAs) were designed to target multiple regions of HBV pregenomic RNA. Mammalian cells transfected with replication competent wild-type HBV DNA of different genotypes, a HBV-expressing stable cell line, a HBV infection model and a hepatitis B surface antigen (HBsAg)-expressing stable cell line were transfected with PspCas13b-BFP (blue fluorescent protein) and crRNA plasmids, and the impact on HBV replication and protein expression was measured. Wild-type HBV DNA, PspCas13b-BFP and crRNA plasmids were simultaneously hydrodynamically injected into mice, and serum HBsAg was measured. PspCas13b mRNA and crRNA were also delivered to a HBsAg-expressing stable cell line via lipid nanoparticles and the impact on secreted HBsAg determined. The HBV-targeting crRNAs strongly suppressed HBV replication and protein expression in mammalian cells by up to 96% (p <0.0001). HBV protein expression was also reduced in a HBV-expressing stable cell line and in the HBV infection model. CRISPR-Cas13b crRNAs reduced HBsAg expression by 50% (p <0.0001) in vivo. Lipid nanoparticle-encapsulated PspCas13b mRNA reduced secreted HBsAg by 87% (p = 0.0168) in a HBsAg-expressing stable cell line.

Copyright © Elsevier Inc. All rights reserved.

Source: McCoullough, L. C., Fareh, M., Hu, W., et al. (2024). CRISPR-Cas13b-mediated Suppression of HBV Replication and Protein Expression. Journal of Hepatology. 2024; 81(5): 794-805. Published: November, 2024. DOI: 10.1016/j.jhep.2024.05.025.

First Influenza Vaccine That Does Not Need to be Administered by a Health Care Provider

[Posted 4/Oct/2024]

AUDIENCE: Infectious Disease, Family Medicine, Nursing

On September 20, 2024, the U.S. Food and Drug Administration approved FluMist for self- or caregiver-administration. FluMist is approved for the prevention of influenza disease caused by influenza virus subtypes A and B in individuals 2 through 49 years of age. FluMist is sprayed into the nose and has been used safely and effectively for many years. It was initially approved by the FDA in 2003 for use in individuals 5 through 49 years of age, and in 2007, the FDA approved the use of FluMist to include children 2 through 5 years of age. It is the first vaccine to prevent influenza, more commonly known as the flu, that does not need to be administered by a health care provider

"Today's approval of the first influenza vaccine for self- or caregiver-administration provides a new option for receiving a safe and effective seasonal influenza vaccine potentially with greater convenience, flexibility and accessibility for individuals and families," said Peter Marks, M.D., Ph.D., director of the FDA's Center for Biologics Evaluation and Research. "Getting vaccinated each year is the best way to prevent influenza, which causes illness in a substantial proportion of the U.S. population every year and may result in serious complications, including hospitalization and death. This approval adds another option for vaccination against influenza disease and demonstrates the FDA's commitment to advancing public health."

The flu is a common and contagious respiratory disease that is caused by influenza viruses that typically circulate during the fall and winter in the U.S. It can cause mild to severe illness with a range of symptoms that usually appear suddenly, such as body aches, fever, coughing, sore throat, tiredness and a stuffy or runny nose. Flu can be life-threatening and cause serious complications that can lead to hospitalization or death, particularly in high-risk groups such as the elderly, young children and people with certain chronic medical conditions. Each flu season is different and the health impacts can be substantial and vary widely from season to season, with some flu seasons being worse than others. According to the U.S. Centers for Disease Control and Prevention, flu has resulted in about 9.3 million to 41 million illnesses, 100,000 to 710,000 hospitalizations and 4,900 to 51,000 deaths annually between 2010 and 2023. Numerous FDA-approved vaccines are available each flu season to prevent influenza.

FluMist contains a weakened form of live influenza virus strains and is sprayed in the nose. A prescription is still required to receive FluMist. There are now two approved options for receiving FluMist. The vaccine may be administered by a health care provider in a health care setting (including a pharmacy) or it may be administered by the vaccine recipient or a caregiver who is 18 years of age or older.

The most commonly reported side effects of FluMist are fever over 100°F in children 2 through 6 years of age, runny nose and nasal congestion in individuals 2 through 49 years of age and a sore throat in adults 18 through 49 years of age.

For those interested in self- or caregiver-administration, the vaccine manufacturer plans to make the vaccine available through a third-party online pharmacy. Those who choose this option will complete a screening and eligibility assessment when they order FluMist. The third-party pharmacy determines eligibility based on the completed screening and, if it is determined that the intended vaccine recipient is eligible, the pharmacy writes the prescription and ships the vaccine to the address provided by the individual who placed the order. The vaccine can then be administered to the prescribed household member(s) at their convenience. A caregiver should administer FluMist to individuals 2 through 17 years of age, as individuals in this age group should not self-administer the vaccine.

A study was conducted with vaccine recipients and caregivers to evaluate whether the instructions for use were appropriately designed so that recipients and caregivers could safely and effectively use the vaccine.

Vaccine recipients and caregivers who administer FluMist will be sent the vaccine, the Prescribing Information, Information for Patients and their Caregivers and Instructions for Use. The Instructions for Use provides detailed instructions for storage, administration and disposal of FluMist.

The FDA granted this approval of FluMist (Influenza Vaccine Live, Intranasal) to MedImmune LLC.

Source: FDA Approves Nasal Spray Influenza Vaccine for Self- or Caregiver-Administration. FDA. 2024; Published: September, 2024. DOI: FDA.