Vaccine optimization for COVID-19: who to vaccinate first?
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ABSTRACT:
SUBMITTER: Matrajt L
PROVIDER: S-EPMC7430607 | biostudies-literature |
REPOSITORIES: biostudies-literature
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Project description:In the last two years, the coronavirus disease 19 (COVID-19) pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been a scientific and social challenge worldwide. Vaccines have been the most effective intervention for reducing virus transmission and disease severity. However, virus genetic variants are still circulating among vaccinated individuals with different symptomatology disease cases. Understanding the protective or disease associated mechanisms in vaccinated individuals is relevant to advance in vaccine development and implementation. To address this objective, serum protein profiles were characterized by quantitative proteomics and data analysis algorithms in four cohorts of vaccinated individuals uninfected and SARS-CoV-2 infected with asymptomatic, nonsevere and severe disease symptomatology. The results showed that immunoglobulins were the most overrepresented proteins in infected cohorts when compared to PCR-negative individuals. The immunoglobulin profile varied between different infected cohorts and correlated with protective or disease associated capacity. Overrepresented immunoglobulins in PCR-positive individuals correlated with protective response against SARS-CoV-2, other viruses, and thrombosis in asymptomatic cases. In nonsevere cases, correlates of protection against SARS-CoV-2 and HBV together with risk of myasthenia gravis and allergy and autoantibodies were observed. Patients with severe symptoms presented risk for allergy, chronic idiopathic thrombocytopenic purpura, and autoantibodies. The analysis of underrepresented immunoglobulins in PCR-positive compared to PCR-negative individuals identified vaccine-induced protective epitopes in various coronavirus proteins including the Spike receptor-binding domain RBD. Non-immunoglobulin proteins were associated with COVID-19 symptoms and biological processes. These results evidence host-associated differences in response to vaccination and the possibility of improving vaccine efficacy against SARS-CoV-2.
2022-10-14 | PXD031969 | Pride
Project description:BackgroundThe success of vaccination efforts to curb the COVID-19 pandemic will require broad public uptake of immunization and highlights the importance of understanding factors associated with willingness to receive a vaccine.MethodsU.S. adults aged 65 and older enrolled in the HeartlineTM clinical study were invited to complete a COVID-19 vaccine assessment through the HeartlineTM mobile application between November 6-20, 2020. Factors associated with willingness to receive a COVID-19 vaccine were evaluated using an ordered logistic regression as well as a Random Forest classification algorithm.ResultsAmong 9,106 study participants, 81.3% (n = 7402) responded and had available demographic data. The majority (91.3%) reported a willingness to be vaccinated. Factors most strongly associated with vaccine willingness were beliefs about the safety and efficacy of COVID-19 vaccines and vaccines in general. Women and Black or African American respondents reported lower willingness to vaccinate. Among those less willing to get vaccinated, 66.2% said that they would talk with their health provider before making a decision. During the study, positive results from the first COVID-19 vaccine outcome study were released; vaccine willingness increased after this report.ConclusionsEven among older adults at high-risk for COVID-19 complications who are participating in a longitudinal clinical study, 1 in 11 reported lack of willingness to receive COVID-19 vaccine in November 2020. Variability in vaccine willingness by gender, race, education, and income suggests the potential for uneven vaccine uptake. Education by health providers directed toward assuaging concerns about vaccine safety and efficacy can help improve vaccine acceptance among those less willing.Trial registrationClinicaltrials.gov NCT04276441.
| S-EPMC8143399 | biostudies-literature
Project description:Early distribution of COVID-19 vaccines was largely driven by population size and did not account for COVID-19 prevalence nor location characteristics. In this study, we applied an optimization framework to identify distribution strategies that would have lowered COVID-19 related morbidity and mortality. During the first half of 2021 in the state of Missouri, optimized vaccine allocation would have decreased case incidence by 8% with 5926 fewer COVID-19 cases, 106 fewer deaths, and 4.5 million dollars in healthcare cost saved. As COVID-19 variants continue to be identified, and the likelihood of future pandemics remains high, application of resource optimization should be a priority for policy makers.
| S-EPMC9866695 | biostudies-literature
Project description:The SARS-CoV-2 Delta (B.1.617.2) variant is capable of infecting vaccinated persons. An open question remains as to whether deficiencies in specific vaccine-elicited immune responses result in susceptibility to vaccine breakthrough infection. We investigated 55 vaccine breakthrough infection cases (mostly Delta) in Singapore, comparing them against 86 vaccinated close contacts who did not contract infection. Vaccine breakthrough cases showed lower memory B cell frequencies against SARS-CoV-2 receptor binding domain (RBD). Compared to plasma antibodies, antibodies secreted by memory B cells retained a higher fraction of neutralizing properties against the Delta variant. Inflammatory cytokines including IL-1β and TNF were lower in vaccine breakthrough infections than primary infection of similar disease severity, underscoring the usefulness of vaccination in preventing inflammation. This report highlights the importance of memory B cells against vaccine breakthrough, and suggests that lower memory B cell levels may be a correlate of risk for Delta vaccine breakthrough infection.
| S-SCDT-EMM-2021-15227 | biostudies-other
Project description:The uptake of the COVID-19 vaccine will determine the trajectory for improved population health and economic recovery from the COVID-19 pandemic. Identifying factors associated with vaccine acceptance is imperative as public health officials strategize to improve uptake. In this study, we identified predictors of vaccine willingness and acceptance using univariate logistic regression to model predictors and calculate odds ratios. Participants (N = 946) who reported greater vaccine willingness were male, older, and had a higher level of education and income. Behaviors indicative of reducing the spread of COVID-19 (e.g., testing) and perceived risk of COVID-19 infection were associated with vaccine willingness, as were participants who believed they were "highly likely" to be infected (by a factor of 8). Education tailored to demographic groups with low vaccine uptake should focus on the high degree of communicability associated with COVID-19. Implementing mobile healthcare screenings could remove barriers to healthcare, thereby improving health equity.
| S-EPMC8603649 | biostudies-literature
Project description:BNT162b2 (Comirnaty®; BioNTech and Pfizer) is a lipid nanoparticle-formulated, nucleoside-modified mRNA vaccine for the prevention of the novel coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. BNT162b2 encodes the SARS-CoV-2 spike protein, the expression of which elicits immune responses against the antigen in recipients. In early December 2020, BNT162b2 received a temporary emergency use authorization (EUA) in the UK and, subsequently, a series of approvals or authorizations for emergency use in Bahrain, Canada, Mexico, Saudi Arabia and the USA. Soon after, BNT162b2 received conditional marketing authorizations in Switzerland (19 December 2020) and the EU (21 December 2020) for active immunization to prevent COVID-19 caused by SARS-CoV-2 in individuals 16 years of age and older. BNT162b2 is administered intramuscularly in a two-dose regimen. This article summarizes the milestones in the development of BNT162b2 leading to these first approvals for the prevention of COVID-19.
| S-EPMC7938284 | biostudies-literature
Project description:Blood collected from adults pre vaccination and post vaccination to study the immune effects of COVID-19 vaccination and how they relate to antibody and T-cell responses.
2023-01-12 | GSE199750 | GEO
Project description:PurposeThis cross-sectional study was conducted to assess the parents' willingness to vaccinate their children with the COVID-19 vaccine and related determinants with specific attention to willingness for adolescents as compared to younger children.MethodsData were collected through a confidential online questionnaire.ResultsA total of 607 parents agreed to participate. More than two-thirds of the parents had good knowledge about the modes of transmission of COVID-19, knew that subjects of any age may be susceptible to SARS-CoV-2 infection, and 85.5% correctly indicated the main behavioral preventive measures against COVID-19. With regard to attitudes, 78.7% agreed that COVID-19 is a serious disease, whereas only 42.3% agreed that it is preventable. Overall, 68.5% were willing to vaccinate their children with the COVID-19 vaccine, specifically 74.5% of parents of adolescents and 65.5% of those of younger children, and the results of the multivariate analysis showed that parents of adolescents aged 12-15 years or 16-18 years compared to those of children aged 11 years or less, those who had more than two children, those who reported that their children had been visited by the primary care pediatrician/physician in the previous 12 months, those who agreed that COVID-19 is a serious disease, considered very useful the COVID-19 vaccine, had been vaccinated against influenza in the previous season, and had received at least one shot of COVID-19 vaccine were more likely to be willing to vaccinate their children.ConclusionIn conclusion, a relevant proportion of parents are willing to vaccinate their children, with the parents of adolescents showing a higher willingness compared to those of younger children. However, there is still room for reducing hesitancy and refusal of the COVID-19 vaccine in this strategic population group by promoting communication to mitigate concerns toward the COVID-19 vaccine.
| S-EPMC8767903 | biostudies-literature
Project description:BackgroundThe ongoing COVID-19 has had a huge worldwide influence. Vaccinations are a crucial component of illness prevention. Thailand's vaccination program for children above the age of five is in its initial stages. Many Thai parents are still unwilling to vaccinate their children with the COVID-19 vaccine. The purpose of this study was to analyze the rate of parental hesitancy and influential variables among Thai parents and guardians living in Thailand.MethodsThis was a cross-sectional survey in Thailand during October and November of 2021. Through online social media networks, an online survey (REDcap) was distributed. Thai parents and guardians with at least one child under the age of 18 were invited to participate.ResultsA total of 1064 responses for analysis. One thousand and sixty-four were available for analysis with 74.4% of those who participated being female. The results found that the parental COVID-19 vaccination hesitancy rate was higher among parents with children under the age of 12 than among parents with children over the age of 12. (56.9% vs 17.1%, p-value < 0.001). Parents were more concerned about vaccination side effects (82.5%), safety (60.0%), and vaccine efficacy (37.2%). Low vaccine reluctance among parent with children age less than 12 years old was associated with higher education (aOR = 0.35, 95 %CI = 0.13-0.93, p-value = 0.036) and a favorable attitude regarding covid-19 immunizations (aOR 0.16, 95% CI 0.04-0.67, p-value 0.012).ConclusionThe majority of Thai parents with children under the age of 12 were hesitant to vaccinate against COVID-19. To minimize Thai parent vaccination hesitancy and increase vaccine uptake among children, the government and health care providers should target this population with evidence-based information, promote positive attitudes toward COVID-19 vaccinations, and encourage educated parents to vaccinate their children at first.
| S-EPMC9190183 | biostudies-literature
Project description: Not available
| S-EPMC7489926 | biostudies-literature