COVID-19 Vaccine Research Articles

From speculative to real: community attitudes towards government COVID-19 vaccine mandates in Western Australia from May 2021 to April 2022.

Many governments employed mandates for COVID-19 vaccines, imposing consequences upon unvaccinated people. Attitudes towards these policies have generally been positive, but little is known about how discourses around them changed as the characteristics of the disease and the vaccinations evolved. Western Australia (WA) employed sweeping COVID-19 vaccine mandates for employment and public spaces whilst the state was closed off from the rest of the country and world, and mostly with no COVID-19 in the community. This article analyses WA public attitudes during the mandate policy lifecycle from speculative to real. Qualitative interview data from 151 adults were analysed in NVivo 20 via a novel chronological analysis anchored in key policy phases: no vaccine mandates, key worker vaccine mandates, vaccine mandates covering 75% of the workforce and public space mandates. Participants justified mandates as essential for border reopening and, less frequently, for goals such as protecting the health system. However, public discourse focusing on 'getting coverage rates up' may prove counter-productive for building support for vaccination; governments should reinforce end goals in public messaging (reducing suffering and saving lives) because such messaging is likely to be more meaningful to vaccination behaviour in the longer term.

Pituitary and COVID-19 vaccination: a systematic review.

This systematic review aims to examine the latest research findings and assess the impact of COVID-19 vaccination on the pituitary gland. PubMed and Tripdatabase were searched from January 1st, 2020 to February 12th, 2024. Case reports, case series and reviews related to post COVID-19 vaccination pituitary disease were included. Eligible articles were tabulated and analysed in the attempt to provide an overview on the epidemiology, clinical presentation, imaging, treatment, outcomes and pathophysiological background of post COVID-19 vaccination pituitary disease. Among the 23 case reports included in this review, post COVID-19 vaccination hypophysitis was reported in 9 patients, pituitary apoplexy (PA) in 6 cases, SIADH in 5 cases and Isolated ACTH deficiency in 2 cases. Additionally, precipitating adrenal crisis was registered in 7 patients and pituitary tumor enlargement in 1 patient after receiving COVID-19 vaccination. Despite the rarity of these events, our research findings suggest an association between COVID-19 vaccination and the subsequent development of pituitary diseases. The most common manifestations include hypophysitis with ADH deficiency, PA and SIADH, with symptoms typically emerging shortly after vaccine administration. Potential pathogenetic mechanisms include molecular mimicry, vaccine adjuvants and vaccine-induced thrombotic thrombocytopenia (VITT), with the presence of ACE2 receptors in the hypothalamus-pituitary system contributing to the process. These findings can aid in diagnostic and treatment decisions for patients presenting with these syndromes. Nevertheless, given the rarity of these events, safety and efficacy of the currently available COVID-19 vaccines remain robust and we strongly advocate continuing pursuing vaccination efforts.

Original COVID-19 priming regimen impacts the immunogenicity of bivalent BA.1 and BA.5 boosters.

Waning antibody responses after COVID-19 vaccination combined with the emergence of the SARS-CoV-2 Omicron lineage led to reduced vaccine effectiveness. As a countermeasure, bivalent mRNA-based booster vaccines encoding the ancestral spike protein in combination with that of Omicron BA.1 or BA.5 were introduced. Since then, different BA.2-descendent lineages have become dominant, such as XBB.1.5, JN.1, or EG.5.1. Here, we report post-hoc analyses of data from the SWITCH-ON study, assessing how different COVID-19 priming regimens affect the immunogenicity of bivalent booster vaccinations and breakthrough infections (NCT05471440). BA.1 and BA.5 bivalent vaccines boosted neutralizing antibodies and T-cells up to 3 months after boost; however, cross-neutralization of XBB.1.5 was poor. Interestingly, different combinations of prime-boost regimens induced divergent responses: participants primed with Ad26.COV2.S developed lower binding antibody levels after bivalent boost while neutralization and T-cell responses were similar to mRNA-based primed participants. In contrast, the breadth of neutralization was higher in mRNA-primed and bivalent BA.5 boosted participants. Combined, our data further support the current use of monovalent vaccines based on circulating strains when vaccinating risk groups, as recently recommended by the WHO. We emphasize the importance of the continuous assessment of immune responses targeting circulating variants to guide future COVID-19 vaccination policies.

Public Preference for Financing Preventive Vaccines in Health Shocks: The Case of COVID-19 Vaccines in a Middle-Income Country.

To effectively manage health crises such as disease pandemics, health authorities require reliable information regarding people's preferences. This helps to ensure timely and targeted interventions and avoids increasing societal costs through developing evidence-based policies. This study investigates the Iranian people's preference for financing coronavirus disease 2019 (COVID-19) vaccines and the factors affecting this. A cross-sectional survey was performed during the third-wave peak of COVID-19 in Iran from 1 to 20 February 2021 utilizing various data collection methods. The public preference regarding imported and domestically produced vaccines, their willingness to fully or partially contribute to the financing of these vaccines, and their willingness to pay (WTP) for domestically produced vaccines using the contingent valuation method was assessed in different scenarios. The determinants of the probability of positive financing preferences were evaluated using an ordered probit regression model. Among the 2071 survey respondents, approximately 60% stated willingness to contribute to vaccine financing in the form of partial or full user fee payments. Forty percent of respondents are willing to be vaccinated if it is provided for free by the government. Interestingly, people's preference for financing the vaccine was not related to the type of vaccine. The regression analysis showed that income, having supplementary insurance, being male, perceived COVID-19 risk, education, and working in the health sector are significantly related to a higher probability of contribution to vaccine financing. Regardless of country of origin of COVID-19 vaccines, vaccination is very important for the Iranian people, and the majority of respondents in our study showed an inclination to contribute to vaccine funding, from partial to full user fees, to achieve higher protection against COVID-19 disease. Hence, ensuring timely access to vaccines during health crises such as pandemics is imperative, as it saves lives and reduces the economic burden of disease. This commitment from the health system can be supported by financial contributions from the general public. In this regard, considering public preferences is strongly advised to policymakers.

Transmission risks of Omicron BA.5 following inactivated COVID-19 vaccines among children and adolescents in China.

As SARS-CoV-2 Omicron variants circulating globally since 2022, assessing the transmission characteristics, and the protection of vaccines against emerging Omicron variants among children and adolescents are needed for guiding the control and vaccination policies. Weconducted a retrospective cohort study for SARS-CoV-2 infections and close contacts aged <18 years from an outbreak seeded by Omicron BA.5 variants. The secondary attack rate (SAR) was calculated and the protective effectsof two doses of inactivated vaccine (mainly Sinopharm /BBIBP-CorV) within a year versus one dose or two doses above a year after vaccination against the transmission and infection of Omicron BA.5 were estimated. A total of 3442 all-age close contacts of 122 confirmedSARS-CoV-2 infections aged 0-17 years were included. The SAR was higher in the household setting and for individuals who received a one-dose inactivated vaccine or those who received a two-dose for more than one year, with estimates of 28.5% (95% credible interval [CrI]: 21.1, 37.7) and 55.3% (95% CrI: 24.4, 84.8), respectively. The second dose of inactivated vaccine conferred substantial protection against all infection and transmission of Omicron BA.5 variants within a year. Our findings support the rollout of the second dose of inactivated vaccine for children and adolescents during the Omciron BA.5 predominant epidemic phase. Given the continuousemergence of SARS-CoV-2 variants, monitoring the transmission risk and corresponding vaccine effectiveness againstSARS-CoV-2 variants among children and adolescents is important to inform control strategy.

Drug-Induced dermatomyositis following COVID-19 vaccination

Drug-Induced dermatomyositis following COVID-19 vaccination

After the pandemic subsides: The impact of motivation for vaccination and attitude toward COVID-19 vaccination certificate toward tourists’ travel intention

After the pandemic subsides: The impact of motivation for vaccination and attitude toward COVID-19 vaccination certificate toward tourists’ travel intention

Sociodemographic determinants of vaccination and willingness to pay for COVID-19 vaccines in Hungary, results of a cross-sectional online questionnaire.

Several different coronavirus disease (COVID-19) vaccines were authorized and distributed all over the world, including Hungary, but vaccination rates and acceptance of the different vaccines varied through 2021 and subsequent years. In Hungary Western vaccines and the Chinese and Russian vaccines were available in early 2021. Understanding preference and willingness to pay (WTP) for the COVID-19 vaccine could provide information for policy decision making to control the COVID-19 pandemic. We aimed to assess the socio-demographic factors influencing the COVID-19 vaccination and to analyse individual preferences for the available COVID-19 vaccines in Hungary. A cross-sectional online questionnaire survey was conducted between 25-05-2021 and 08-06-2021 exploring the vaccine acceptance and WTP for vaccination in the Hungarian general population. To assess the preferences towards the different vaccines available in Hungary at the time of the study, we used a multi-step WTP task. Altogether 2,000 respondents filled out our survey, with the average age of 49.1 (SD = 15.3), out of whom 370 respondents (18.5%) stated that they already had a COVID-19 infection. Age above 65years, male gender, higher level of education, higher income and residence in the capital or county seats were associated with a higher probability of vaccination. The average WTP ranged from 14.2 to 30.3 EUR for the different vaccine types. Males, respondents with higher education and income stated a higher WTP value for all vaccines. Better socioeconomic status increased both vaccination coverage and willingness to pay for vaccines.

U.S. Parental Vaccine Hesitancy and the COVID-19 Vaccine: A Scoping Review.

Parental vaccine hesitancy has been a hotly debated issue long before the COVID-19 pandemic. Still, the emergence of a new vaccine during this public health crisis made even pro-vaccine individuals reconsider vaccines for their children. This scoping review was conducted to understand why parents expressed hesitancy towards the COVID-19 vaccine for children under 12 years old. The search included primary sources of evidence published in English from 2020-2022. A final 41 articles met the criteria. Overall, more vaccine-hesitant characteristics were non-white, female, lower education level, lower income, on public insurance, conservative political affiliation, younger age, and rural residence. Concerns affecting confidence in the vaccine were the risk of possible side effects and lack of trust in the development of the emergency approval of the vaccine. School nurses can acknowledge parental fears and provide parents with evidence-based information when communicating with them about vaccinations.

Heterogeneous cutaneous reactions following COVID-19 vaccination and infection

Heterogeneous cutaneous reactions following COVID-19 vaccination and infection

COVID-19 Vaccines in the Pediatric Population: A Focus on Cardiac Patients

Due to the deleterious global impact of the COVID-19 pandemic, tremendous effort has been invested in the development of vaccines against the virus. Vaccine candidates are first tested in adult populations, a number of which have been approved for EUL by the WHO, and are in use across the USA and MENA region. The question remains whether these (or other) vaccines should be recommended to a neonatal, pediatric, and/or adolescent cohort. Incidence and severity of COVID-19 infection are low in pediatric, neonatal, and adolescent patients. Since both overall incidence and severity are lower in children than in adults, safety is an important consideration in vaccine approval for these age groups, in addition to efficacy and a decreased risk of transmission. The following review discusses vaccine immunology in children aged 0–18 years, with emphasis on the negative impact of the COVID-19 pandemic on the lives of children, considerations for pediatric vaccine approval, and available vaccines for pediatric cohorts along with a breakdown of the efficacy, advantages, and disadvantages for each. This review also contains current and future perspectives, as well as a section on the cardiovascular implications and related dynamics of pediatric COVID-19 vaccination.

The Multi-discourse Fight of COVID-19 Vaccine in the World of Digital Platforms: Rethinking Popularity of Anti-intellectualism

Abstract This study explored how government institutions used digital platforms to enhance knowledge and share scientific information regarding the development and distribution of COVID-19 vaccines by drawing samples from official Twitter accounts in five different countries that were front-runners in vaccine manufacturing. Through content analysis, we selected a total of 243 tweets with 4,678 comments from the five Twitter accounts, and data were categorized into two sets for analysis, the first stage being to assign sentiment scores to all the collected comments from tweets to determine their positivity, negativity, and neutrality. Secondly, we analyzed themes derived from comments and established through the themes that geopolitics has exacerbated the anti-intellectualist logic of viewing science as impractical for the control and prevention of the pandemic leading to the domination of irrational thinking towards vaccine efficacy, the origin of COVID-19, and the undermining of the global health governance on COVID-19 control and management.

Clinical manifestations and long-term symptoms associated with SARS-CoV-2 omicron infection in children aged 0–17 years in Beijing: a single-center study

ObjectiveThe study aims to analyze the clinical characteristics of acute phase of SARS-CoV-2 infection in children aged 0–17 years with the Omicron variant, and summarize the persistent symptoms or new-onset clinical manifestations from 4 to 12 weeks after acute COVID. Explore the association between the vaccination status and SARS-CoV-2 neutralizing antibody levels post infection among preschool-aged children. The comprehensive study systematically describes the clinical characteristics of children infected with SARS-CoV-2, providing a foundation for diagnosis and evaluating long-term COVID in pediatric populations.MethodsThe study enrolled children who were referred to the Children's Hospital, Capital Institute of Pediatrics, (Beijing, China) from January 10, 2023 to March 31, 2023. Participants were classified as infant and toddlers, preschool, school-age, and adolescent groups. Children or their legal guardians completed survey questionnaires to provide information of previous SARS-CoV-2 infection history, as well as clinical presentation during the acute phase and long-term symptoms from 4 to 12 weeks following infection. Furthermore, serum samples were collected from children with confirmed history of SARS-CoV-2 infection for serological testing of neutralizing antibodies.ResultsThe study recruited a total of 2,001 children aged 0–17 years who had previously tested positive for SARS-CoV-2 through nucleic acid or antigen testing. Fever emerged as the predominant clinical manifestation in 1,902 (95.1%) individuals with body temperature ranging from 37.3 to 40.0°C. Respiratory symptoms were identified as secondary clinical manifestations, with cough being the most common symptom in 777 (38.8%) children, followed by sore throat (22.1%), nasal congestion (17.8%), and runnning nose (17.2%). Fatigue (21.6%), headache (19.8%) and muscle-joint pain (13.5%) were frequently reported systemic symptoms in children. The proportion of children with symptoms of SARS-CoV-2 infection varied across age groups. 1,100 (55.0%) children experienced persistent symptoms from 4 to 12 weeks post the acute phase of infection. Trouble concentrating (22.1%), cough (22.1%), and fatigue (12.1%) were frequently reported across age groups in the extended period. A limited number of children exhibited cardiovascular symptoms with chest tightness, tachycardia, and chest pain reported by 3.5%, 2.5%, and 1.8% of children, respectively. Among 472 children aged 3–5 years, 208 children had received two doses of SARS-CoV-2 vaccine at least 6 months prior to infection, and no association was found between the incidence of long-term COVID and pre-infection vaccination statuses among the 3–5 years age groups (χ2 = 1.136, P = 0.286).ConclusionsIn children aged 0–17 years infected with SARS-CoV-2 Omicron variant, fever was the primary clinical manifestation in the acute phase, followed by respiratory symptoms, systemic non-specific and digestive presentations. In particular, respiratory and digestive system symptoms were more frequent in children aged above 6 years. Regarding the long-term symptoms from 4 to 12 weeks post-infection, the most common presentations were concentrating difficulty, cough, and fatigue. The incidence of persistent symptoms of SARS-CoV-2 did not exhibit a significant correlation with vaccination status, which was attributed to the waning efficacy of the vaccine-induced humoral immune response after 6 months.

Glycosylated SARs Cov 2 interaction with plant lectins.

Lectins are non-immune carbohydrate-binding proteins/glycoproteins that are found everywhere in nature, from bacteria to human cells. They have also been a valuable biological tool for the purification and subsequent characterisation of glycoproteins due to their carbohydrate binding recognition capacity. Antinociceptive, antiulcer, anti-inflammatory activities and immune modulatory properties have been discovered in several plant lectins, with these qualities varying depending on the lectin carbohydrate-binding site. The Coronavirus of 2019 (COVID-19) is a respiratory disease that has swept the globe, killing millions and infecting millions more. Despite the availability of COVID-19 vaccinations and the vaccination of a huge portion of the world's population, viral infection rates continue to rise, causing major concern. Part of the reason for the vaccine's ineffectiveness has been attributed to repeated mutations in the virus's epitope determinant elements. The surface of the Coronavirus envelope is heavily glycosylated, with approximately sixty N-linked oligomannose, composite, and hybrid glycans covering the core of Man3GlcNAc2Asn. Some O-linked glycans have also been discovered. Many of these glyco-chains have also been subjected to multiple mutations, with only a few remaining conserved. As a result, numerous plant lectins with specificity for these viral envelope sugars have been discovered to interact preferentially with them and are being investigated as a potential future tool to combat coronaviruses such as the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) by preventing viral attachment to the host. The review will discuss the possible applications of plant lectins as anti-coronaviruses including SARS-CoV-2, antinociceptive, anti-inflammation and its immune modulating effect.

Acute Noninfectious Anterior Ocular Inflammation Following Ranibizumab Biosimilar Intravitreal Injection in a Patient With Recent COVID-19 Vaccination

Acute Noninfectious Anterior Ocular Inflammation Following Ranibizumab Biosimilar Intravitreal Injection in a Patient With Recent COVID-19 Vaccination

Pre-existing cell populations with cytotoxic activity against SARS-CoV-2 in people with HIV and normal CD4/CD8 ratio previously unexposed to the virus

IntroductionHIV-1 infection may produce a detrimental effect on the immune response. Early start of antiretroviral therapy (ART) is recommended to preserve the integrity of the immune system. In fact, people with HIV (PWH) and normal CD4/CD8 ratio appear not to be more susceptible to severe forms of COVID-19 than the general population and they usually present a good seroconversion rate in response to vaccination against SARS-CoV-2. However, few studies have fully characterized the development of cytotoxic immune populations in response to COVID-19 vaccination in these individuals.MethodsIn this study, we recruited PWH with median time of HIV-1 infection of 6 years, median CD4/CD8 ratio of 1.0, good adherence to ART, persistently undetectable viral load, and negative serology against SARS-CoV-2, who then received the complete vaccination schedule against COVID-19. Blood samples were taken before vaccination against COVID-19 and one month after receiving the complete vaccination schedule. ResultsPWH produced high levels of IgG against SARS-CoV-2 in response to vaccination that were comparable to healthy donors, with a significantly higher neutralization capacity. Interestingly, the cytotoxic activity of PBMCs from PWH against SARS-CoV-2-infected cells was higher than healthy donors before receiving the vaccination schedule, pointing out the pre-existence of activated cell populations with likely unspecific antiviral activity. The characterization of these cytotoxic cell populations revealed high levels of Tgd cells with degranulation capacity against SARS-CoV-2-infected cells. In response to vaccination, the degranulation capacity of CD8+ T cells also increased in PWH but not in healthy donors.DiscussionThe full vaccination schedule against COVID-19 did not modify the ability to respond against HIV-1-infected cells in PWH and these individuals did not show more susceptibility to breakthrough infection with SARS-CoV-2 than healthy donors after 12 months of follow-up. These results revealed the development of protective cell populations with broad-spectrum antiviral activity in PWH with normal CD4/CD8 ratio and confirmed the importance of early ART and treatment adherence to avoid immune dysfunctions.

Safety, immunogenicity and efficacy of the self-amplifying mRNA ARCT-154 COVID-19 vaccine: pooled phase 1, 2, 3a and 3b randomized, controlled trials

Combination of waning immunity and lower effectiveness against new SARS-CoV-2 variants of approved COVID-19 vaccines necessitates new vaccines. We evaluated two doses, 28 days apart, of ARCT-154, a self-amplifying mRNA COVID-19 vaccine, compared with saline placebo in an integrated phase 1/2/3a/3b controlled, observer-blind trial in Vietnamese adults (ClinicalTrial.gov identifier: NCT05012943). Primary safety and reactogenicity outcomes were unsolicited adverse events (AE) 28 days after each dose, solicited local and systemic AE 7 days after each dose, and serious AEs throughout the study. Primary immunogenicity outcome was the immune response as neutralizing antibodies 28 days after the second dose. Efficacy against COVID-19 was assessed as primary and secondary outcomes in phase 3b. ARCT-154 was well tolerated with generally mild–moderate transient AEs. Four weeks after the second dose 94.1% (95% CI: 92.1–95.8) of vaccinees seroconverted for neutralizing antibodies, with a geometric mean-fold rise from baseline of 14.5 (95% CI: 13.6–15.5). Of 640 cases of confirmed COVID-19 eligible for efficacy analysis most were due to the Delta (B.1.617.2) variant. Efficacy of ARCT-154 was 56.6% (95% CI: 48.7– 63.3) against any COVID-19, and 95.3% (80.5–98.9) against severe COVID-19. ARCT-154 vaccination is well tolerated, immunogenic and efficacious, particularly against severe COVID-19 disease.

COVID-19 vaccine fatigue in Scotland: how do the trends in attrition rates for the second and third doses differ by age, sex, and council area?

Abstract Vaccine fatigue is the propensity for individuals to start but not finish a vaccination program with several doses, which means they are less protected. Our study examines vaccine fatigue in the COVID-19 vaccination programme in Scotland. We model the attrition rates across multiple doses with a hierarchical binomial logistic regression model with correlated age- and area-specific random effects with conditional autoregressive priors, where inference uses integrated nested Laplace approximations. We find attrition rates smoothly decrease with increasing age, are much higher for the third dose than the second, and are generally higher for males than females.

Non-cross-reactive epitopes dominate the humoral immune response to COVID-19 vaccination – kinetics of plasma antibodies, plasmablasts and memory B cells

IntroductionCOVID-19 vaccines are highly effective in inducing protective immunity. While the serum antibody response to COVID-19 vaccination has been studied in depth, our knowledge of the underlying plasmablast and memory B cell (Bmem) responses is still incomplete. Here, we determined the antibody and B cell response to COVID-19 vaccination in a naïve population and contrasted it with the response to a single influenza vaccination in a primed cohort. In addition, we analyzed the antibody and B cell responses against the four endemic human coronaviruses (HCoVs).MethodsMeasurement of specific plasma IgG antibodies was combined with functional analyses of antibody-secreting plasmablasts and Bmems. SARS-CoV-2- and HCoV-specific IgG antibodies were quantified with an in-house bead-based multiplexed immunoassay.ResultsThe antibody and B cell responses to COVID-19 vaccination reflected the kinetics of a prime-boost immunization, characterized by a slow and moderate primary response and a faster and stronger secondary response. In contrast, the influenza vaccinees possessed robust immune memory for the vaccine antigens prior to vaccination, and the recall vaccination moderately boosted antibody production and Bmem responses. Antibody levels and Bmem responses waned several months after the 2nd COVID-19 vaccination, but were restored upon the 3rd vaccination. The COVID-19 vaccine-induced antibodies mainly targeted novel, non-cross-reactive S1 epitopes of the viral spike protein, while cross-reactive S2 epitopes were less immunogenic. Booster vaccination not only strongly enhanced neutralizing antibodies against an original SARS-CoV-2 strain, but also induced neutralizing antibodies against the Omicron BA.2 variant. We observed a 100% plasma antibody prevalence against the S1 subunits of HCoVs, which was not affected by vaccination.DiscussionOverall, by complementing classical serology with a functional evaluation of plasmablasts and memory B cells we provide new insights into the specificity of COVID-19 vaccine-induced antibody and B cell responses.

Immunogenicity and Safety of SARS-CoV-2 Protein Subunit Recombinant Vaccine (IndoVac®) as a Booster Dose against COVID-19 in Indonesian Adults

According to the WHO target product profile for COVID-19 vaccines, the vaccine in development should be indicated for active immunisation in all populations. Therefore, PT Bio Farma developed a candidate vaccine in a subunit protein recombinant platform to help overcome the issue. This trial was an observer-blind, randomised, prospective intervention study. This study targeted individuals who had received complete primary doses of the authorised/approved COVID-19 vaccine. The groups were divided into the primary inactivated vaccine (CoronaVac®) group, the primary viral vector vaccine (ChAdOx1) group, and the primary mRNA vaccine (BNT162b2) group that received the recombinant protein (IndoVac®). The groups were compared with the control and primary mRNA vaccine (BNT162b2). The participants enrolled in the study were from two primary care centres in Bandung City and three primary care centres in Denpasar City. A total of 696 participants were enrolled from 1 September to 31 October 2022. The demographic characteristics of the all-vaccine group showed a uniform distribution. The results showed that, compared with the control, the investigational product had inferior effectiveness 14 days after the booster dose was administered. However, 28 days after the booster dose, the investigational product exhibited non-inferior effectiveness compared with the primary groups that received CoronaVac® (GMR 0.76 (0.57–0.99)) and ChAdOx1 (GMR 0.72 (0.56–59.93)), but the BNT162b2 group (GMR 0.61 (0.39–0.94)) was inferior to the control. At 12 months follow-up after the booster dose, three serious adverse events (SAEs) were reported in three participants, with causality not correlated with the investigated products. Neither AEs of special interest nor severe COVID-19 cases were reported throughout the follow-up period; thus, the IndoVac® vaccine as a booster was immunogenic and safe. Until the 6-month follow-up after the booster dose, the IndoVac® vaccine was well tolerated and all reported AEs resolved. This vaccine is registered and can be included in the immunisation programme.