Explore the vast range of titles available.

•Existing Ebola interventions are implemented after an outbreak is declared. Preventive vaccination may provide a complementary option to help protect against unpredictable outbreaks.•Our novel individual-based Ebola transmission model accounted for important disease transmission factors, such as human movement and contact heterogeneity.•Targeted preventive vaccination reduced Ebola cases, hospitalizations, and deaths.•Preventive vaccination flattened epidemic curves, protecting healthcare systems and providing more time to implement additional interventions. Nonpharmaceutical interventions (NPI) and ring vaccination (i.e., vaccination that primarily targets contacts and contacts of contacts of Ebola cases) are currently used to reduce the spread of Ebola during outbreaks. Because these measures are typically initiated after an outbreak is declared, they are limited by real-time implementation challenges. Preventive vaccination may provide a complementary option to help protect communities against unpredictable outbreaks. This study aimed to assess the impact of preventive vaccination strategies when implemented in conjunction with NPI and ring vaccination. A spatial-explicit, individual-based model (IBM) that accounts for heterogeneity of human contact, human movement, and timing of interventions was built to represent Ebola transmission in the Democratic Republic of the Congo. Simulated preventive vaccination strategies targeted healthcare workers (HCW), frontline workers (FW), and the general population (GP) with varying levels of coverage (lower coverage: 30% of HCW/FW, 5% of GP; higher coverage: 60% of HCW/FW, 10% of GP) and efficacy (lower efficacy: 60%; higher efficacy: 90%). The IBM estimated that the addition of preventive vaccination for HCW reduced cases, hospitalizations, and deaths by ∼11 % to ∼25 % compared with NPI + ring vaccination alone. Including HCW and FW in the preventive vaccination campaign yielded ∼14 % to ∼38 % improvements in epidemic outcomes. Further including the GP yielded the greatest improvements, with ∼21 % to ∼52 % reductions in epidemic outcomes compared with NPI + ring vaccination alone. In a scenario without ring vaccination, preventive vaccination reduced cases, hospitalizations, and deaths by ∼28 % to ∼59 % compared with NPI alone. In all scenarios, preventive vaccination reduced Ebola transmission particularly during the initial phases of the epidemic, resulting in flatter epidemic curves. The IBM showed that preventive vaccination may reduce Ebola cases, hospitalizations, and deaths, thus safeguarding the healthcare system and providing more time to implement additional interventions during an outbreak.

Background Several prolonged typhoid fever epidemics have been reported since 2010 throughout eastern and southern Africa, including Malawi, caused by multidrug-resistant Salmonella Typhi. The World Health Organization recommends the use of typhoid conjugate vaccines (TCVs) in outbreak settings; however, current data are limited on how and when TCVs might be introduced in response to outbreaks. Methodology We developed a stochastic model of typhoid transmission fitted to data from Queen Elizabeth Central Hospital in Blantyre, Malawi from January 1996 to February 2015. We used the model to evaluate the cost-effectiveness of vaccination strategies over a 10-year time horizon in three scenarios: (1) when an outbreak is likely to occur; (2) when an outbreak is unlikely to occur within the next ten years; and (3) when an outbreak has already occurred and is unlikely to occur again. We considered three vaccination strategies compared to the status quo of no vaccination: (a) preventative routine vaccination at 9 months of age; (b) preventative routine vaccination plus a catch-up campaign to 15 years of age; and (c) reactive vaccination with a catch-up campaign to age 15 (for Scenario 1). We also explored variations in outbreak definitions, delays in implementation of reactive vaccination, and the timing of preventive vaccination relative to the outbreak. Results Assuming an outbreak occurs within 10 years, we estimated that the various vaccination strategies would prevent a median of 15–60% of disability-adjusted life-years (DALYs). Reactive vaccination was the preferred strategy for WTP values of $0–300 per DALY averted. For WTP values > $300, introduction of preventative routine TCV immunization with a catch-up campaign was the preferred strategy. Routine vaccination with a catch-up campaign was cost-effective for WTP values above $890 per DALY averted if no outbreak occurs and > $140 per DALY averted if implemented after the outbreak has already occurred. Conclusions Countries for which the spread of antimicrobial resistance is likely to lead to outbreaks of typhoid fever should consider TCV introduction. Reactive vaccination can be a cost-effective strategy, but only if delays in vaccine deployment are minimal; otherwise, introduction of preventive routine immunization with a catch-up campaign is the preferred strategy.

One of the major objectives in a democratic state is ensuring health security of the citizens including combating epidemic diseases. The subject matter of this article is the presentation and analysis of legal regulations regarding preventive vaccination in Poland, in particular the aspect of imposing a legal obligation and restricting parents’ right to express consent for medical intervention. The reflections made herein are aimed at finding an answer to the question whether the adopted legal solutions are admissible in a democratic state with regard to ensuring health security. The purpose of the analysis is also to assess whether the abovementioned legal regulations have been formulated in a clear way and do not raise interpretation doubts and, consequently, whether they are comprehensible to the parents obliged to comply with them. As it follows from analysis of the legal provisions, parents must not refuse to subject a child to obligatory preventive vaccination and their consent is not required by law, both as regards the medical qualifying examination to exclude contraindications to performing vaccination and the vaccination itself. It is a legal obligation, from which exemption is only possible on grounds of certain medical conditions that would render vaccination inadvisable. The legal provisions that concern obligatory preventive vaccination in Poland, including in particular those referring to its enforceability, have not been formulated in a way that is sufficiently comprehensible to parents who are under the obligation of complying with them, irrespective of the fact that the language of the provisions of law should be clear and raise no interpretative doubts. In a democratic state the protection of public health against epidemic hazards justifies the implementation of legal solutions that restrict an individual’s freedom of self-determination, thus limiting the right of patients or their statutory representatives to grant or refuse consent for a medical intervention in the form of preventive vaccination – the purpose of this legal solution being to prioritize the safeguarding of state health security. It is vitally important to engage in a social dialogue with the purpose of convincing the public of the need for vaccination, its significance and its implementation for the better good.

Background: Influenza imposes a substantial burden on Argentina, particularly among adults aged 50–64 with comorbidities and those aged ≥65. The adjuvanted trivalent influenza vaccine (aTIV) has shown superior effectiveness compared with non-adjuvanted vaccines; however, its cost-effectiveness and budget impact in the 50–64 high-risk population have not been assessed nationally. This study evaluates the cost-effectiveness and budget impact of introducing aTIV for high-risk adults aged 50–64, alongside its use in adults aged ≥65, compared with standard-dose trivalent influenza vaccine (SD-TIV) from the Argentine health care system perspective. Methods: A decision-analytic static model was used to compare aTIV with SD-TIV over a single influenza season. In addition, a 5-year budget impact analysis (BIA) was conducted under scenarios of progressive uptake. Model inputs were derived from international literature, local data, and expert opinion. Deterministic and probabilistic sensitivity analyses were performed. Results: Compared with SD-TIV, aTIV yielded a lifetime gain of 1489 quality-adjusted life-years (QALYs) at an incremental cost of USD 8.34 million, resulting in an incremental cost-effectiveness ratio (ICER) of USD 5599 per QALY gained—well below Argentina’s cost-effectiveness threshold (USD 11,059/QALY). Higher vaccine acquisition costs were largely offset by reductions in outpatient visits and hospitalizations. The BIA showed a modest average annual per-member-per-month increase of USD 0.0025, remaining below the estimated budget impact threshold (USD 0.0065). Conclusions: Implementing aTIV in adults aged ≥50 with risk factors would be cost-effective and affordable in Argentina. These findings support the consolidation and potential expansion of current vaccination strategies to reduce influenza burden.

Background: Within the African meningitis belt, yearly outbreaks of cerebrospinal meningitis (CSM), with incidence rates of 10–100 cases per 100 000 population, are typically punctuated by explosive epidemics occurring every 8–12 years, with incidence rates that can exceed 1000 cases per 100 000 population. From 1928 to 2018, Nigeria recorded the highest number (21%) of cases in the region. The reactive vaccination strategy, a protocol with major drawbacks, has been the vaccination method utilised in Nigeria. Aim: This review highlights the need for governments within the African meningitis belt to start preparations against the next explosive CSM epidemic expected to occur between 2024 and 2028 using the preventive vaccination strategy. Methods: We performed a literature search on the Google Scholar search engine using relevant search strings and included studies and reports between 1905 and 2022 that met set criteria. Results: Neisseria meningitidis serogroups A, B, C, W135, X, and Y; Haemophilus influenzae serotypes a, b, c, e, and f; and Streptococcus pneumoniae serotypes 1, 4, 5, 6, 9, 19, 19F, and 20 were implicated as aetiologies. However, the reactive vaccination strategy was only used against N. meningitidis A or C, H. influenzae b, and pneumococcal conjugate vaccine. Between 2011 and 2017, a polysaccharide vaccine (ACW or ACYW) active against serogroups A, C, W and Y was used within the African meningitis belt for the first time. Varying genotypes of N. meningitidis, H. influenzae and S. pneumoniae were identified. Conclusion: Our results revealed a very high success rate for the preventive vaccination strategy. What this study adds: In order to ensure reductions in the morbidity and mortality associated with invasive CSM, the Federal Ministry of Health, Nigeria, should leverage existing knowledge of the circulating serogroups, serotypes, and genotypes of the primary bacterial aetiologies and commence the implementation of the preventive vaccination strategy.

Background The vaccine is a preparation of biological origin containing antigens that stimulate the body’s immune system to produce acquired immunity. Vaccines can contain killed or “live” (attenuated) microorganisms as well as fragments of these (antigens). Although many vaccines are used routinely in pregnancy to provide a seroprotective immune response for mother, fetus and neonate there is much controversy over their use during this unique time. The aim of the study was to find out about the knowledge of adult Poles on the use of preventive vaccinations during pregnancy. Methods The study involved 700 people (100%) aged 18 to 80 years ( x ¯ = 32.16 ± 16.46). Most of the respondents were women (511; 73%). The study consisted of 9 questions about preventive vaccinations of pregnant women and 5 questions about members of the studied group. The aforementioned questions formed the basis of the preparation of the presented article. Results A significant part of respondents (322; 46%) did not have knowledge on the topic of safeness of using preventive vaccinations during pregnancy, 196 (28%) respondents believed that such procedure is not safe. Most of the respondents (371; 53%) did not know about the possibility of using “live” vaccines during pregnancy. 14 (2%) of respondents believed that pregnancy should be terminated in case of administration of a “live” vaccine to a pregnant woman. According to 294 (42%) respondents, vaccinations with “live” vaccines should be completed at least 3 months before the planned pregnancy. The subjects were not aware of the issue of post-exposure vaccination against tetanus and rabies among pregnant women. The respondents’ responses were divided on the issue of the safest trimester of pregnancy for vaccine administration. Almost 1/3 of the respondents (203; 29%) indicated the third trimester as the safest for their performance. Conclusion The knowledge of the surveyed group, the majority of whom were women, about the use of vaccinations before and during pregnancy was unsatisfactory. There is a need to educate the public about the benefits and risks of performing or avoiding preventive vaccinations during pregnancy.

The development of an effective, affordable prophylactic vaccine against hepatitis C virus (HCV) remains a medical priority. The recently described chimeric HBV–HCV subviral envelope particles could potentially be used for this purpose, as they could be produced by industrial procedures adapted from those established for the hepatitis B virus (HBV) vaccine. We show here, in an animal model, that pre-existing immunity acquired through HBV vaccination does not influence the immunogenicity of the HCV E2 protein presented by these chimeric particles. Thus, these chimeric HBV–HCV subviral envelope particles could potentially be used as a booster in individuals previously vaccinated against HBV, to induce protective immunity to HCV.

Hepatitis C virus (HCV) persistently infects approximately 71 million people globally. To prevent infection a vaccine which elicits neutralizing antibodies against the virus envelope proteins (E1/E2) which are required for entry into host cells is desirable. DNA vaccines are cost-effective to manufacture globally and despite recent landmark studies highlighting the therapeutic efficacy of DNA vaccines in humans against cervical cancer, DNA vaccines encoding E1/E2 developed thus far are poorly immunogenic. We now report a novel and highly immunogenic DNA vaccination strategy that incorporates secreted E1 and E2 (sE1 and sE2) into oligomers by fusion with the oligomerization domain of the C4b-binding protein, IMX313P. The FDA approved plasmid, pVax, was used to encode sE1, sE2, or sE1E2 with or without IMX313P, and intradermal prime-boost vaccination studies in BALB/c mice showed that vaccines encoding IMX313P were the most effective in eliciting humoral and cell-mediated immunity against the envelope proteins. Further boosting with recombinant E1E2 proteins but not DNA nor virus-like particles (VLPs) expressing E1E2 increased the immunogenicity of the DNA prime-boost regimen. Nevertheless, the antibodies generated by the homologous DNA prime-boost vaccinations more effectively inhibited the binding of VLPs to target cells and neutralized transduction with HCV pseudoparticles (HCVpp) derived from different genotypes including genotypes 1, 2, 3, 4, 5, and 6. This report provides the first evidence that IMX313P can be used as an adjuvant for E1/E2-based DNA vaccines and represents a translatable approach for the development of a HCV DNA vaccine.

Introduction: The number of people refusing to vaccinate their children is growing in Poland every year. Anti-vaccine organisations lead very fierce disinformation campaigns. The incidence of vaccine preventable diseases is on the rise. Monitoring of parents’ attitudes towards preventive vaccinations and gauging the level of their understanding of the issue may enable more effective actions of organisations responsible for public health. Aim: The objectives of the study included finding out about parents’ opinions and views as well as evaluating their knowledge about vaccinations in Poland. The study was also to define a parents’ assessment of the range of campaigns promoting vaccination and actions of anti-vaccine movements. Material and method: The studies were carried out with a survey conducted among 233 parents or legal guardians of the children being under the obligation of vaccinations. Results: Nearly 90% of respondents are proponents of vaccinations, one-third of them consider some vaccinations unnecessary, and almost 7% of the surveyed describe themselves as opponents of vaccinations. 78% among the parents surveyed encountered campaigns promoting the Childhood Immunisation Programme, and most of them regard such campaigns as useful. Anti-vaccine movements were heard of by 62.4% of all the surveyed parents or legal guardians. 60% of respondents regard their own knowledge of the issue of vaccinations as sufficient. However, only 35% of respondents provided correct answers to the control questions about preventive vaccinations. People with higher education have better knowledge on vaccinations, whereas those with primary education have the best opinion on their own knowledge. Conclusions: Parents’ knowledge in terms of preventive vaccinations seems inadequate. The number of opponents of preventive vaccinations is systematically growing. The paediatrician being the main source of information on the issue of vaccinations for the parents. Monitoring of parents’ attitudes and opinions about the issue of preventive vaccination will be useful in better directing promoting campaigns in social media, and in adjusting healthcare workers’ activities to specific social groups.

Introduction: The immunosuppressive effect of the disease and the applied treatment in children with juvenile idiopathic arthritis increases the risk of infections. It is therefore essential that vaccinations be properly implemented and that a proper serological response is provoked after the vaccination. A competent nurse acting in compliance with the current recommendations constitutes one of the safety pillars of immunization of pediatric patients with juvenile idiopathic arthritis. Aim: To discuss evidence-based recommendations for immunization of pediatric patients with juvenile idiopathic arthritis in the context of nursing vaccination practice and vaccinology education. Material and Methods: A systematic review of the literature presenting evidence-based recommendations of the European League Against Rheumatism (EULAR) expert group on immunization of children with juvenile idiopathic arthritis. Compilation of source data selected subjectively by the authors in a standard literature search of Medline, Cochrane and Scopus databases, including both recommendations for immunization of children with juvenile idiopathic arthritis and the tasks to be performed by nurses in the course of vaccine administration. As part of the standard literature review of Medline, Cochrane and Scopus databases, including both recommendations for immunization of children with juvenile idiopathic arthritis and the tasks to be performed by nurses in the course of vaccine administration. Results: Most vaccines are immunogenic and safe for patients with juvenile idiopathic arthritis. The use of attenuated vaccines in patients receiving long-term immunosuppressive treatment should be considered with particular caution. Education and further training of nurses should take into account the recommendations and principles of immunization regarding children with juvenile idiopathic arthritis. Nurses should present the current knowledge of active immunoprophylaxis in such a way as to encourage parents/guardians to vaccinate their children in accordance with the national guidelines. Conclusion: The recommendations of the European League Against Rheumatism place special emphasis on the use of active immunoprophylaxis in the form of vaccination in children with juvenile idiopathic arthritis. The immunization schedule must be adjusted to the applied JIA treatment regimen. Such a stance on this matter is highly important as treatment regimens increasingly include biological drugs. Correctly performed by a nurse, a vaccination procedure is an important determinant of the desired immunoprophylactic results and minimizes the risk of adverse events following immunization. The priority for a nurse who provides active immunoprophylaxis should be to systematically broaden her training in immunization of chronically ill children, including juvenile idiopathic arthritis.