Development of bioabsorbable fiber-reinforced composites from bicomponent fibers of polylactic acid and its copolymers

The feasibility of using core.sheath type bicomponent polylactide filaments to produce bioabsorbable continuous, fiber-reinforced composites was investigated The core component was poly(L-lactic acid) (PLLA) An adhesion study was used to determined that poly(L/DL-lactic acid) (PLDL) would be used as the sheath component. Bicomponent filaments with 1:2, 1 1, 2:1, 3:1, and 4:1 core:sheath ratios were produced by melting spinning and drawing processes. The M core:sheath filaments had the best mechanical properties with tensile strength and modulus values of approximately 300 MPa and 4000 MPa, respectively. The 1.1 PLLA PLDL filaments were consolidated into 2.0 mm composite rods using a pultusion die heated at 140 °C, 150 °C, 160 °C, 170 °C, and 175 °C. Maximum-properties were achieved at a processing temperature of 150 °C. The tensile strength of the composite rods was 102 MPa, shear strength of 75 MPa, and bending strength of 117.9 MPa The properties of the bicomponent filaments were not transferred to the composite rods because consolidation of the filaments by heating resulting annealing behavior which reduced the strength of the core fibers. Other factors such as degradation, loss of amorphous orientation, and changes in fiber morphology also contributed to the loss of strength

Entry receptors - The gateway to alphavirus infection

Alphaviruses are enveloped, insect-transmitted, positive-sense RNA viruses that infect humans and other animals and cause a range of clinical manifestations, including arthritis, musculoskeletal disease, meningitis, encephalitis, and death. Over the past four years, aided by CRISPR/Cas9-based genetic screening approaches, intensive research efforts have focused on identifying entry receptors for alphaviruses to better understand the basis for cellular and species tropism. Herein, we review approaches to alphavirus receptor identification and how these were used for discovery. The identification of new receptors advances our understanding of viral pathogenesis, tropism, and evolution and is expected to contribute to the development of novel strategies for prevention and treatment of alphavirus infection

Genome-to-genome analysis highlights the effect of the human innate and adaptive immune systems on the hepatitis C virus

Outcomes of hepatitis C virus (HCV) infection and treatment depend on viral and host genetic factors. Here we use human genome-wide genotyping arrays and new whole-genome HCV viral sequencing technologies to perform a systematic genome-to-genome study of 542 individuals who were chronically infected with HCV, predominantly genotype 3. We show that both alleles of genes encoding human leukocyte antigen molecules and genes encoding components of the interferon lambda innate immune system drive viral polymorphism. Additionally, we show that IFNL4 genotypes determine HCV viral load through a mechanism dependent on a specific amino acid residue in the HCV NS5A protein. These findings highlight the interplay between the innate immune system and the viral genome in HCV control

Vancomycin AUC/MIC ratio and 30-day mortality in patients with Staphylococcus aureus bacteremia

A ratio of the vancomycin area under the concentration-time curve to the MIC (AUC/MIC) of ≥ 400 has been associated with clinical success when treating Staphylococcus aureus pneumonia, and this target was recommended by recently published vancomycin therapeutic monitoring consensus guidelines for treating all serious S. aureus infections. Here, vancomycin serum trough levels and vancomycin AUC/MIC were evaluated in a "real-world" context by following a cohort of 182 patients with S. aureus bacteremia (SAB) and analyzing these parameters within the critical first 96 h of vancomycin therapy. The median vancomycin trough level at this time point was 19.5 mg/liter. There was a significant difference in vancomycin AUC/MIC when using broth microdilution (BMD) compared with Etest MIC (medians of 436.1 and 271.5, respectively; P373, derived using classification and regression tree analysis, was associated with reduced mortality (P=0.043) and remained significant in a multivariable model. This study demonstrated that we obtained vancomycin trough levels in the target therapeutic range early during the course of therapy and that obtaining a higher vancomycin AUC/MIC (in this case, >373) within 96 h was associated with reduced mortality. The MIC test method has a significant impact on vancomycin AUC/MIC estimation. Clinicians should be aware that the current target AUC/MIC of ≥400 was derived using the reference BMD method, so adjustments to this target need to be made when calculating AUC/MIC ratio using other MIC testing methods. Copyrigh

The psychological and wellbeing impacts of quarantine on frontline workers during COVID-19 and beyond

Objective: The current study investigated the experiences, wellbeing impacts, and coping strategies of frontline workers who participated in “Hotels for Heroes”, an Australian voluntary hotel quarantine program during the COVID-19 pandemic. The program was open to those who were COVID-19 positive or exposed to COVID-19 as part of their profession. Methods: Frontline workers who had stayed in voluntary quarantine between April 2020 and March 2021 were invited to participate in a voluntary, anonymous, cross-sectional online survey including both quantitative and qualitative responses. Complete responses were collected from 106 participants, which included data on sociodemographic and occupational characteristics, experiences of the Hotels for Heroes program, and validated mental health measures. Results: Mental health problems were prevalent amongst frontline workers (e.g., moderate anxiety symptoms, severe depression symptoms, and greater than usual impact of fatigue). For some, quarantine appeared to be helpful for anxiety and burnout, but quarantine also appeared to impact anxiety, depression, and PTSD negatively, and longer stays in quarantine were associated with significantly higher coronavirus anxiety and fatigue impacts. The most widely received support in quarantine was from designated program staff; however, this was reportedly accessed by less than half of the participants. Conclusions: The current study points to specific aspects of mental health care that can be applied to participants of similar voluntary quarantine programs in the future. It seems necessary to screen for psychological needs at various stages of quarantine, and to allocate appropriate care and improve its accessibility, as many participants did not utilise the routine support offered. Support should especially target disease-related anxiety, symptoms of depression and trauma, and the impacts of fatigue. Future research is needed to clarify specific phases of need throughout quarantine programs, and the barriers for participants receiving mental health supports in these contexts

Factors affecting the delivery and acceptability of the ROWTATE telehealth vocational rehabilitation intervention for traumatic injury survivors: a mixed-methods study

Background: Returning to work after traumatic injury can be problematic. We developed a vocational telerehabilitation (VR) intervention for trauma survivors, delivered by trained occupational therapists (OTs) and clinical psychologists (CPs), and explored factors affecting delivery and acceptability in a feasibility study. Methods: Surveys pre- (5 OTs, 2 CPs) and post-training (3 OTs, 1 CP); interviews pre- (5 OTs, 2 CPs) and post-intervention (4 trauma survivors, 4 OTs, 2 CPs). Mean survey scores for 14 theoretical domains identified telerehabilitation barriers (score ≤ 3.5) and facilitators (score ≥ 5). Interviews were transcribed and thematically analysed. Results: Surveys: pre-training, the only barrier was therapists’ intentions to use telerehabilitation (mean = 3.40 ± 0.23), post-training, 13/14 domains were facilitators. Interviews: barriers/facilitators included environmental context/resources (e.g., technology, patient engagement, privacy/disruptions, travel and access); beliefs about capabilities (e.g., building rapport, complex assessments, knowledge/confidence, third-party feedback and communication style); optimism (e.g., impossible assessments, novel working methods, perceived importance and patient/therapist reluctance) and social/professional role/identity (e.g., therapeutic methods). Training and experience of intervention delivery addressed some barriers and increased facilitators. The intervention was acceptable to trauma survivors and therapists. Conclusion: Despite training and experience in intervention delivery, some barriers remained. Providing some face-to-face delivery where necessary may address certain barriers, but strategies are required to address other barriers

Effects of antiplatelet therapy on stroke risk by brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases: subgroup analyses of the RESTART randomised, open-label trial

Background Findings from the RESTART trial suggest that starting antiplatelet therapy might reduce the risk of recurrent symptomatic intracerebral haemorrhage compared with avoiding antiplatelet therapy. Brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases (such as cerebral microbleeds) are associated with greater risks of recurrent intracerebral haemorrhage. We did subgroup analyses of the RESTART trial to explore whether these brain imaging features modify the effects of antiplatelet therapy