ABSTRACT
Background: Production of affordable coronavirus disease 2019 (COVID-19) vaccines in low- and middle-income countries is needed. NDV-HXP-S is an inactivated egg-based recombinant Newcastle disease virus vaccine expressing the spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It's being developed by public sector manufacturers in Thailand, Vietnam, and Brazil; herein are initial results from Thailand. Methods: This phase 1 stage of a randomised, dose-escalation, observer-blind, placebo-controlled, phase 1/2 trial was conducted at the Vaccine Trial Centre, Mahidol University (Bangkok). Healthy males and non-pregnant females, aged 18-59 years and negative for SARS-CoV-2 antibodies, were eligible. Participants were randomised to receive one of six treatments by intramuscular injection twice, 28 days apart: 1 µg, 1 µg+CpG1018 (a toll-like receptor 9 agonist), 3 µg, 3 µg+CpG1018, 10 µg, or placebo. Participants and personnel assessing outcomes were masked to treatment. The primary outcomes were solicited and spontaneously reported adverse events (AEs) during 7 and 28 days after each vaccination, respectively. Secondary outcomes were immunogenicity measures (anti-S IgG and pseudotyped virus neutralisation). An interim analysis assessed safety at day 57 in treatment-exposed individuals and immunogenicity through day 43 per protocol. ClinicalTrials.gov (NCT04764422). Findings: Between March 20 and April 23, 2021, 377 individuals were screened and 210 were enroled (35 per group); all received dose one; five missed dose two. The most common solicited AEs among vaccinees, all predominantly mild, were injection site pain (<63%), fatigue (<35%), headache (<32%), and myalgia (<32%). The proportion reporting a vaccine-related AE ranged from 5·7% to 17·1% among vaccine groups and was 2·9% in controls; there was no vaccine-related serious adverse event. The 10 µg formulation's immunogenicity ranked best, followed by 3 µg+CpG1018, 3 µg, 1 µg+CpG1018, and 1 µg formulations. On day 43, the geometric mean concentrations of 50% neutralising antibody ranged from 122·23 international units per mL (IU/mL; 1 µg, 95% confidence interval (CI) 86·40-172·91) to 474·35 IU/mL (10 µg, 95% CI 320·90-701·19), with 93·9% to 100% of vaccine groups attaining a ≥ 4-fold increase over baseline. Interpretation: NDV-HXP-S had an acceptable safety profile and potent immunogenicity. The 3 µg and 3 µg+CpG1018 formulations advanced to phase 2. Funding: National Vaccine Institute (Thailand), National Research Council (Thailand), Bill & Melinda Gates Foundation, National Institutes of Health (USA).
ABSTRACT
BACKGROUND: Production of affordable coronavirus disease 2019 (COVID-19) vaccines in low- and middle-income countries is needed. NDV-HXP-S is an inactivated egg-based Newcastle disease virus vaccine expressing the spike protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It's being developed in Thailand, Vietnam, and Brazil; herein are initial results from Thailand. METHODS: This phase 1 stage of a randomised, dose-escalation, observer-blind, placebo-controlled, phase 1/2 trial was conducted at the Vaccine Trial Centre, Mahidol University (Bangkok). Healthy adults aged 18-59 years, non-pregnant and negative for SARS-CoV-2 antibodies were eligible. Participants were block randomised to receive one of six treatments by intramuscular injection twice, 28 days apart: 1 µg±CpG1018 (a toll-like receptor 9 agonist), 3 µg±CpG1018, 10 µg, or placebo. Participants and personnel assessing outcomes were masked to treatment. The primary outcomes were solicited and spontaneously reported adverse events (AEs) during 7 and 28 days after each vaccination, respectively. Secondary outcomes were immunogenicity measures (anti-S IgG and pseudotyped virus neutralisation). An interim analysis assessed safety at day 57 in treatment-exposed individuals and immunogenicity through day 43 per protocol. ClinicalTrials.gov ( NCT04764422 ). FINDINGS: Between March 20 and April 23, 2021, 377 individuals were screened and 210 were enrolled (35 per group); all received dose one; five missed dose two. The most common solicited AEs among vaccinees, all predominantly mild, were injection site pain (<63%), fatigue (<35%), headache (<32%), and myalgia (<32%). The proportion reporting a vaccine-related AE ranged from 5·7% to 17·1% among vaccine groups and was 2·9% in controls; there was no vaccine-related serious adverse event. The 10 µg formulation's immunogenicity ranked best, followed by 3 µg+CpG1018, 3 µg, 1 µg+CpG1018, and 1 µg formulations. On day 43, the geometric mean concentrations of 50% neutralising antibody ranged from 122·23 IU/mL (1 µg, 95% CI 86·40-172·91) to 474·35 IU/mL (10 µg, 95% CI 320·90-701·19), with 93·9% to 100% of vaccine groups attaining a ≥4-fold increase over baseline. INTERPRETATION: NDV-HXP-S had an acceptable safety profile and potent immunogenicity. The 3 µg and 3 µg+CpG1018 formulations advanced to phase 2. FUNDING: National Vaccine Institute (Thailand), National Research Council (Thailand), Bill & Melinda Gates Foundation, National Institutes of Health (USA).
ABSTRACT
PURPOSE: To determine whether self-examination through video, by creating visual illness narratives of living with asthma, is associated with improved disease-specific quality of life. METHODS: Nineteen children and adolescents (aged 8-19 years) with moderate or severe asthma by 1992 National Heart, Lung, and Blood Institute criteria were administered the Pediatric Asthma Quality of Life Questionnaire (PAQLQ) twice before (T1 and T2) and once immediately after (T3) they made Video Intervention/Prevention Assessment (VIA) visual narratives of their lives with asthma. The PAQLQ is a previously validated scale (range 1-7) that measures asthma-specific quality of life in three domains: activity limitation, symptoms, and emotional function. Overall and domain-specific PAQLQ scores were compared using general linear model repeated measures analysis. Participant exit interviews about the VIA experience were analyzed using grounded theory. RESULTS: The mean PAQLQ score did not change between T1 and T2, but significantly increased from 4.78 at T1 to 5.30 at T3 (p = .045). The activity level domain score increased from a mean of 4.08 at T1 to 5.08 at T3 (p < or = .001). Qualitative data indicated that VIA was associated with increased disease-awareness and more confident self-management for most participants. CONCLUSIONS: The results of this pilot study suggest that creating visual illness narratives is associated with improved quality of life for children and adolescents with asthma. Research with larger numbers and a control group is needed to evaluate VIA as an intervention and to further quantify its impact on health-related quality of life.
Subject(s)
Asthma/psychology , Asthma/rehabilitation , Quality of Life , Self Efficacy , Video Recording , Adolescent , Adult , Asthma/complications , Child , Female , Health Status , Humans , Male , Treatment OutcomeABSTRACT
Sulphadoxine/pyrimethamine (SP) has become the first-line treatment of uncomplicated malaria in a number of African countries. Molecular surveillance of resistance-mediating mutations in Plasmodium falciparum dihydrofolate reductase (dhfr) and dihydropteroate synthase (dhps) has been proposed as a means of predicting SP treatment outcomes, but optimal methods of surveillance in different populations have not been well established. To investigate the relationship between molecular markers of SP resistance, host immunity, and response to therapy, we evaluated the association between the presence of five key dhfr and dhps mutations at enrollment and clinical outcome in children and adults treated with SP for uncomplicated malaria in Kampala, Uganda. Clinical treatment failure was 11% at 14 days, increasing to 30% at 28 days, after excluding new infections. Outcomes varied markedly based on the number of dhfr and dhps mutations and on the age of treated subjects. All infections with less than two dhfr/dhps mutations were successfully treated. Treatment failure associated with any two, three, or four dhfr/dhps mutations occurred in nine of 24 (38%) children up to 5 years, but not in older patients (0/20). In the presence of all five mutations, treatment failure occurred equally in children aged 5 years or younger [7/16 (44%)] and in older patients [8/16 (50%)]. Our results showed that age, a surrogate marker of antimalarial immunity, had a major impact on the relationship between polymorphisms in SP target enzymes and treatment outcomes. The use of molecular markers of SP resistance to predict treatment failure rates should take age into account.
