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Healthcare workers' attitudes toward and factors influencing their acceptance of an annual COVID-19 booster vaccine: a cross-sectional study in Palestine

Abstract

Background

The emergence of several SARS-CoV-2 variants may necessitate an annual COVID-19 booster vaccine. This study aimed to evaluate healthcare workers' (HCWs) acceptance of a COVID-19 yearly booster vaccine if recommended and its association with their attitudes and burnout levels.

Methods

We used an online self-administered questionnaire to conduct a cross-sectional study of all HCWs in the West Bank and Gaza Strip of Palestine between August and September 2022. We used the Vaccination Attitudes Examination scale to assess HCWs' vaccination attitudes and the Maslach Burnout Inventory to assess work-related Burnout. In addition, we conducted logistic regression to identify factors independently associated with the acceptance of the booster vaccine.

Results

The study included 919 HCWs; 52.4% were male, 46.5% were physicians, 30.0% were nurses, and 63.1% worked in hospitals. One-third of HCWs (95% CI: 30.5%-36.7%) said they would accept an annual COVID-19 booster vaccine if recommended. HCWs who are suspicious of vaccine benefits [aOR = .70; 95%CI: .65-.75] and those concerned about unforeseeable future effects [aOR = .90; 95%CI: .84-.95] are less likely to accept the booster vaccine if recommended, whereas those who receive annual influenza vaccine are more likely to get it [aOR = 2.9; 95%CI: 1.7–5.0].

Conclusion

Only about a third of HCWs would agree to receive an annual COVID-19 booster vaccine if recommended. Mistrust of the vaccine's efficacy and concerns about side effects continue to drive COVID-19 vaccine reluctance. Health officials need to address HCWs' concerns to increase their acceptance of the annual vaccine if it is to be recommended.

Peer Review reports

Introduction

COVID-19 first appeared in Wuhan, China, in December 2019 and rapidly spread worldwide, prompting the World Health Organization (WHO) to declare a pandemic in March 2020. As of September 2022, it is estimated that 610 million people have contracted the disease, with 1.5 million fatalities [1]. In Palestine, approximately 620,000 cases have been confirmed, resulting in 5,403 deaths over the same period [2]. It also significantly impacted the healthcare system, increasing admissions and infection of healthcare workers (HCWs) and decreasing essential healthcare utilization [3].

Vaccination is among the most advantageous health interventions due to its positive effects on population health and the economy. COVID-19 vaccination has effectively prevented the disease and lowered the risk of hospitalization and death [4]. This protection, however, declines over time due to waning immunity and, most importantly, the emergence of new virus variants [5]. Several SARS-CoV-2 variants have emerged since the pandemic's beginning, the most significant of which were Alpha, Beta, Gamma, Delta, and Omicron. These variants were linked to increased transmissibility or virulence and decreased vaccination effectiveness and were responsible for multiple waves of infections worldwide [6]. The World Health Organization mentions these to explain why we may need COVID-19 booster doses [7] and raises the possibility that a COVID-19 booster vaccine is required. Some wealthy countries are taking steps in this direction by promoting annual COVID-19 vaccination. According to the White House, the United States could have a COVID-19 booster schedule similar to the annual influenza vaccine [8]. In addition, yearly COVID-19 vaccinations are expected in the United Kingdom, particularly for HCWs, to protect against anticipated COVID-19 surges during the winter [9].

Primary prevention strategies rely on the vaccination practices and attitudes of HCWs. Positive attitudes towards vaccination protect themselves, their families, and patients and encourage others to adopt it. They serve as vaccine enablers and communicators to patients and the public [10], but their reluctance to accept booster doses may undermine vaccine trust [11]. Several studies have shown that HCW vaccination hesitancy is variable. A rapid systematic review found that vaccine acceptance varied widely, ranging from 27.7% to 77.3% [12]. Another meta-analysis study revealed that HCWs' COVID-19 vaccine acceptance pooled effect value was 51% [13], while it was generally low in Africa [14].

Similarly, studies conducted in Palestine shortly before the vaccine’s initial launch showed that HCWs hesitated to accept the vaccination [15, 16]. Hesitancy has been linked to various factors, including sex, profession, education, previous influenza vaccination, self-perceived risk, vaccine safety and effectiveness concerns, and many other factors [12,13,14]. A recently published study reported that almost a quarter of British HCWs hesitated to receive a regular COVID-19 vaccination. Age, ethnicity, previous COVID-19 vaccination, attitudes, and influenza vaccinations in previous seasons were all associated with regular COVID-19 vaccination [17].

Negative attitudes toward healthy behaviors may result from the stress of HCWs [18]. Burnout, a psychological work-related stress syndrome that develops in response to occupational stressors [19], is common among HCWs, exacerbated by the COVID-19 pandemic [20]. It consists of three elements: emotional exhaustion (EE), depersonalization (DP) (becoming emotionally distant or indifferent), and a diminished sense of personal accomplishment (PA) [19]. Burnout has many consequences, including decreased job satisfaction, absenteeism, anxiety, depression, substance abuse, suboptimal patient care, and impaired quality of care [21].

Palestinian HCWs experience high levels of Burnout, which can be attributed to the pressures of daily work and the challenges Palestine faces as a developing country still under occupation [22, 23]. In addition to its direct effects, Burnout can have indirect consequences on HCWs, leading to a decline in service quality characterized by reduced adherence to guidelines, ineffective communication, compromised patient outcomes and diminished safety standards [24].

This is the first study in the Eastern Mediterranean Region to examine HCWs' willingness to accept and attitudes toward an annual COVID-19 booster vaccine. A better understanding of the acceptance rate of an annual COVID-19 booster vaccine among HCWs and the factors influencing it would aid in developing interventions to reduce hesitancy and increase uptake. The primary objective of this study is to assess the willingness of healthcare workers (HCWs) to accept an annual COVID-19 booster vaccine, should it be recommended. Secondary objectives are 1. investigating the relationship between HCWs' attitudes towards the COVID-19 vaccine and their willingness to accept the booster dose, 2. examining the association between HCWs’ burnout levels and their acceptance of the vaccine booster dose. The primary hypotheses to be examined in this study are: 1. There is a significant relationship between HCWs' attitudes towards the COVID-19 vaccine and their acceptance of the vaccine booster dose, and 2. There is a significant association between HCWs' level of Burnout and their acceptance of the COVID-19 vaccine booster dose.

Methods

Study design and population

We conducted a cross-sectional study from August to September 2022 using an online self-administered questionnaire. We targeted all Palestinian HCWs, including physicians, nurses, and allied health professionals such as lab technicians, radiology technicians, and occupational and physical therapists. These HCWs worked in various healthcare settings throughout the West Bank and Gaza Strip, including hospitals and primary healthcare clinics run by government and non-governmental organizations. The inclusion criteria were currently HCW, including physicians, nurses, and paramedics, and working in a health care setting. The inclusion of this heterogeneous group of HCWs (physicians, nurses, etc.) with diverse background characteristics is because they all share a high susceptibility to the infection. More importantly, they all share a characteristic of still being seen as a trustworthy information source, promoting vaccination in low-resource settings and among other groups hesitant to vaccinate [10, 25, 26].

A minimum sample size of 911 HCWs was necessary to determine the prevalence of hesitancy for annual COVID-19 vaccination. It was calculated using the formula n = [DEFF*Np(1-p)]/[(d2/Z21-α/2*(N-1) + p*(1-p), where Z = 1.96 is the confidence level statistic, DEFF = 1 is design effect, P = 33% is the estimated proportion of HCWs willing to receive an annual COVID-19 booster vaccine based on previous studies [15], and d = 3% is the absolute precision. Thus, a minimum sample size of 911 HCWs was necessary to achieve the study objectives.

We employed a convenience sampling technique to recruit participants for our study. Specifically, we distributed Google Forms links and introductory invitations to closed institutional groups of HCWs through messaging platforms such as WhatsApp and Messenger. This method allowed us to efficiently reach out to healthcare professionals within specific institutional networks, ensuring a diverse representation of participants from various healthcare settings. The study was carried out in compliance with current laws on ethical standards and privacy protection. Along with the questionnaire, we enclosed an introductory note explaining the study's purpose and assured respondents that their anonymity and the confidentiality of their responses would be strictly protected. In addition, participants were asked to confirm their agreement with the information provided and their willingness to participate online by tapping the "I agree" item. The Institutional Review Board of An-Najah National University approved the study [Ref. #: Med. August 2022/26].

Measurement tools

The research team developed the questionnaire for this study using related literature and previous studies (Supplementary File 1). Before being finalized and distributed to participants, the questionnaire was reviewed by three experts in the field and piloted with 30 HCWs. It is divided into four sections. The first section assessed HCWs' background, professional, and clinical characteristics, which included age, gender, profession, workplace place, marital status, smoking status, and presence of chronic diseases. The second section evaluated variables associated with COVID-19 in terms of the history of COVID-19 by polymerase chain reaction (PCR), history of vaccination, and vaccine side effects.

Furthermore, we assessed the annual influenza vaccine uptake by asking, "Do you get the influenza vaccine yearly?". The questionnaire incorporated a specific question to evaluate the primary outcome of the study, directly inquiring of HCWs whether they would agree to receive an annual COVID-19 booster vaccine if recommended, allowing for three potential responses: "Yes," "No," or "Not decided.” Participants were subsequently categorized as acceptant or hesitant, with acceptant referring to HCWs who responded yes. In contrast, hesitant encompassed those who replied negatively or expressed uncertainty by stating "No" or "Not decided."

The third section used the Vaccination Attitudes Examination Scale (VAX) adjusted to the COVID-19 vaccine to assess the HCWs' vaccination attitudes [27]. It has 12 items divided into four sub-scales: mistrust of vaccine benefits, worries over future effects, concerns about commercial profits, and preference for natural immunity. Each subscale has three items scored from 1 (strongly agree) to 6 (strongly disagree), except items of the first subscale, which are reversely coded. Higher scores indicate anti-vaccination attitudes. We used the Arabic version of the VAX scale, which has been used in previous studies and had high internal consistency [28]. The internal consistency coefficient (Cronbach's α) of the VAX scale used in this study was 0.84.

The last section evaluated HCWs' work-related Burnout using the Maslach Burnout Inventory (MBI) [29]. It is a 22-item tool that asks participants, on a 7-point Likert scale (from 0, 'never,' to 6, 'daily'), how frequently they had recently experienced specific feelings related to their work. The MBI is the most commonly used tool, and it consists of three scales: EE (nine items), which measures one's emotional and physical exhaustion as a result of his work; DP (five items), which assesses work-related stress, lack of feeling, impersonal responses to patient care, and reduced empathy; and PA (eight items), which evaluates the individuals' perception of their work and reflects how they perceive its significance. High scores on the EE or DP scales or low scores on the PA scale indicate a high level of Burnout. While no definite cut-off points for MBI subscales exist, we used the following cut-off points from a previous study on HCWs in the region [30]: Burnout was high on EE and PA, and DP when the scores were ≥ 35, ≤ 29, or ≥ 11, respectively. It was moderate on EE, PA, and DP when scores were 21–30, 41–36, and 6–10, respectively. HCWs who ranked high in all three dimensions were considered to have very high Burnout. Internal consistency (Cronbach's) values for the EE, DP, and PA dimensions used in this study were all high: 0.88, 0.80, and 0.90, respectively.

Data analysis

Data entry and analysis were done with the IBM SPSS Statistics for Windows, version 21 (IBM Corp., Armonk, NY, USA). We summarized categorical variables using frequency distributions and proportions, and the associations were tested using the chi-square test. Next, the Kolmogorov–Smirnov test was used to determine the normality of continuous variables, which revealed that they were normally distributed. The data was then summarized using mean and standard deviation (SD), and the association between different groups was conducted using the independent t-test. The binary logistic regression model accounted for confounders and assessed factors independently associated with vaccine booster dose hesitancy. Adjusted odds ratios (aOR) and 95% confidence intervals (CI) were used to present the findings. We computed the area under the curve-receiver operating characteristic (AUC-ROC) to evaluate the performance of the multivariate logistic regression model using fivefold cross-validation and 100 iterations. The AUC equals 82%, which is considered an excellent capacity to discriminate between an acceptant and a hesitant class. This step was done by R cran version 4.3. The significance level was set at a P-value of less than 0.05.

Results

Background characteristics

The study included 919 HCWs in total. Table 1 shows the sociodemographic and work-related characteristics of the study sample. It was found that 52.4% of respondents were male, 58.7% were under 30, and 53.5% were married. Almost half of the participants were employed by the government, 46.5% were physicians, 30.0% were nurses, and 63.1% worked in hospitals. About one-fourth of HCWs smoked, and 7.6% had chronic diseases.

Table 1 Participants' background and demographic characteristics with the willingness to get an annual COVID booster vaccine (n = 919)

Annual COVID-19 booster vaccine

Overall, 308 HCWs (33.5%; 95% CI: 30.5%-36.7%) said they would accept an annual COVID-19 booster vaccine if recommended, while 611 (66.5%; 95% CI: 44.7%- 69.5%) were hesitant; 44.7% said no, and 21.8% were undecided (Fig. 1).

Fig. 1
figure 1

Healthcare workers' responses about receiving an annual COVID-19 booster vaccine

The bivariate analysis revealed significant variations in booster vaccine acceptability based on gender, profession, and work division. For instance, male HCWs were more likely to accept the annual COVID-19 booster vaccine than females (52.4% vs 27.9%; P value 0.001). Furthermore, physicians were more likely to accept the annual COVID-19 booster vaccine than nurses (51.8% vs. 30.0%; P value < 0.001), and HCWs working in hospitals exhibit higher levels of booster vaccine acceptance than HCWs working at PHC centers (63.1% vs 27.0%; P value 0.001) (Table 1). Additionally, HCWs who had previously received the COVID-19 vaccine (52.4% vs. 27.9%; P value < 0.001) and those who routinely received an annual influenza vaccine (56.9% vs. 29.9%; P value < 0.001) demonstrated a greater likelihood of acceptance (Table 2). On the other hand, HCWs who are suspicious of vaccine benefits and concerned about unforeseeable future consequences are more likely to be hesitant (Table 2).

Table 2 HCWs' history of COVID-19 infection, COVID-19 vaccine uptake, and vaccination attitudes with the willingness to get an annual COVID booster vaccine (n = 919)

Burnout among HCWs

Overall, 273 HCWs (29.7%) reported high EE, 454 HCWs (49.4%) reported high DP and 202 HCWs (22.0%) reported high reduced PE. In addition, higher levels of vaccine hesitancy were observed among HCWs with moderate and high levels of Burnout in the three domains, but none reached statistical significance (Table 3).

Table 3 Burnout among HCWs and its association with the willingness to get an annual COVID-19 booster vaccine (n = 919)
Determinants of annual COVID booster vaccine acceptance

A logistic regression was performed to ascertain the effects of sex, professional work division, COVID and Influenza vaccination history, burnout construct, and attitudes towards vaccination on the likelihood of accepting an annual COVID booster vaccine. The model explained 40.0% (Nagelkerke R square) of the variance in accepting an annual COVID booster vaccine. HCWs who are suspicious of vaccine benefits [p-value < 0.001, aOR = 0.70; 95%CI: 0.65-0.75] and those concerned about unforeseeable future effects [p-value 0.001, aOR = 0.90; 95%CI: 0.84-0.95] are less likely to accept an annual COVID-19 booster vaccine if recommended, whereas those who receive annual influenza vaccine are more likely to accept it [p-value < 0.001, aOR = 2.9; 95%CI: 1.7–5.0] (Table 4).

Table 4 Multivariable analysis of variables associated with willingness to get an annual COVID booster vaccine

Discussion

The study reveals that HCWs are generally hesitant to receive an annual COVID-19 booster vaccine, with only one-third accepting it. These findings are significantly lower than those reported among HCWs in high-income countries. For example, in recent surveys, 76.5% of British HCWs [17] and 74.5% of Polish HCWs were willing to receive COVID-19 vaccine booster doses. Higher rates of COVID-19 vaccine booster dose acceptance were reported among HCWs in the United States (83.6%) [31] and China (90.3%) [32]. This subject has not been widely researched in Arab countries. A survey conducted in Saudi Arabia revealed that 67.3% of HCWs expressed willingness to receive the COVID-19 booster vaccine [33].

Generally, the acceptance rates of the COVID-19 vaccine in Arab countries are low and exhibit variability across different countries. A multinational study found that more than half of Arabs are unwilling to receive the COVID-19 vaccine [34]. According to a recent systematic review and meta-analysis, the acceptance rates range from 20% to 97.8%, with countries such as Egypt, Palestine, Jordan, and Oman demonstrating low rates [35]. This limited acceptance may impede the effectiveness of disease control efforts and shape perceptions regarding vaccinations, mainly if the requirement for annual vaccinations is enforced.

The effectiveness of vaccines, particularly the booster vaccine, was a significant factor in the general public's acceptance of the COVID-19 booster vaccine among Algerians and Americans [36, 37]. However, employee organization trust plays a significant role in hesitancy in the UK. It has also been reported that ethnic diversity affects the hesitancy levels of HCWs [17]. In Palestine, and with comparable results in Africa, hesitance to receive a booster vaccination was strongly correlated with a lack of confidence in the value of vaccination [38]. Worries about unforeseen future effects were another factor that hindered the acceptance of COVID-19 booster vaccinations. Also, study participants from Poland and Jordan disagreed that a booster dose of the COVID-19 vaccine would be as safe as the initial doses [39, 40]. Reassuring HCWs of the efficacy of COVID-19 vaccines and being transparent about their side effects are crucial strategies for addressing vaccine benefits and fear of side effects, thereby increasing acceptance of booster vaccination. The publication of new studies showing the vaccine's long-term safety can dispel many HCWs’ concerns and increase the vaccine's acceptance.

Acceptance of an annual COVID-19 booster vaccine is significantly associated with annual influenza vaccination. The logistic regression results indicated that healthcare workers who receive the yearly influenza vaccine are 2.9 times more likely to accept an annual COVID-19 booster vaccine. A review of COVID-19 vaccination hesitancy among HCWs found that previous vaccination habits, particularly for influenza, were associated with support for COVID-19 vaccination [41]. As participation in healthy behavior is expected to be generic, it is assumed that receipt of a previous COVID-19 vaccine should be associated with acceptance of an annual vaccine [31].

The results showed no association between gender and willingness to get the annual COVID-19 booster vaccine, contrary to previous studies. Women have historically been more reluctant to receive vaccinations than men [42], specifically for the COVID-19 vaccine; people surveyed believed that the vaccine could cause infertility [43]. Previous COVID-19 intention and uptake studies demonstrated that female HCWs were less likely to intend to take and certainly take the COVID-19 vaccine [15, 28]. The disappearance of the gender gap for the annual booster COVID-19 in this study could be attributed to the general low acceptance rate among all and the high level of concern about unanticipated future effects shared by both genders. These results emphasize that interventions aimed at increasing the uptake of a booster vaccination amongst Palestinian HCWs should not necessarily be targeted toward either gender.

We did not find a significant association between the HCW profession and acceptance of an annual COVID-19 booster. French nurses were more reluctant to accept the COVID-19 vaccine during the initial pandemic wave than physicians [44]. Similarly, a systematic review study investigated the predictors of vaccine hesitancy and acceptance across different groups and reached an identical conclusion [45]. Although our analysis did not uncover this correlation, the rate of vaccination acceptance among nurses remains low, which may negatively impact the vaccination compliance of individuals who interact professionally or personally with vaccine-hesitant nurses in the future.

The lack of belief in the vaccine's effectiveness and concerns about potential unseen side effects have a negative impact on the willingness to accept an annual COVID-19 booster dose, as indicated by the logistic regression analysis. Studies have shown that mistrust in vaccine efficacy has remained constant throughout the COVID-19 pandemic. This could be attributed to the limited availability of long-term research on the topic and the rapid introduction of the COVID-19 vaccine despite the disparity between early COVID-19 and post-COVID-19 anti-vaccination attitudes [46].

The relationship between HCWs' vaccination hesitancy and Burnout is a significant concern in the healthcare sector. Few studies suggest that vaccine hesitancy among HCWs' can be linked to increased levels of burnout [47]. Galanis P and colleagues found that Greek nurses who had encountered Burnout were less likely to accept a booster COVID-19 vaccine dose [47, 48]. HCWs' unwillingness to receive vaccinations not only indicates a potential lack of understanding about its benefits but also can be attributed to stress and emotional exhaustion [49]. EE was present in one-third of the sample, and high DP and low PA were present in approximately half of the sample. Our results on the prevalence of Burnout are significantly higher than HCWs in Turkey [50]. The burden of pandemic-related challenges and concerns about personal health and safety may exacerbate Burnout among HCWs. This situation presents a dual challenge, as Burnout affects not only individual well-being but also has implications for the overall quality of patient care. Our bivariate analysis results indicated that those who reported higher burnout levels for the three subscales were more likely to be hesitant to receive an annual booster dose, though this was not statistically significant. A survey conducted in the United States revealed that stress does not affect COVID-19 vaccine hesitancy [51].

Our findings should be interpreted with the following limitations in mind. First, the obtained results may be of limited representativeness due to the non-random sampling technique used to recruit participants for this study. Second, our study is susceptible to self-reporting bias as we relied on HCWs to share their views and practices regarding COVID-19 vaccines. This may not be entirely accurate, as people have a tendency to present themselves positively. Comparing these results to future vaccine uptake would be a helpful analysis. Third, even though the first question in the survey asked HCWs if they agreed to participate, an online survey makes estimating the response rate difficult. This may introduce non-response bias, undermining the study's generalizability. Last, the cross-sectional survey design limits our ability to establish causal relationships, and HCWs' attitudes may change over time. Despite these limitations, the study included a large sample of healthcare workers from various sectors, making it one of the first to address this issue in this population group. The findings should aid in a better understanding of the problem and future research.

Conclusion

In conclusion, the acceptance of an annual COVID-19 booster vaccine is low among Palestinian HCWs. Mistrust of the annual COVID-19 booster vaccine efficacy and concerns about unforeseen side effects remain significant factors in COVID-19 vaccine hesitancy. We recommend launching educational campaigns to address concerns about vaccine benefits and potential long-term effects, as well as developing tailored communication strategies for specific groups, such as female HCWs, nurses, and PHC center staff, to improve understanding and acceptance of the booster vaccine, which helps to increase trust in the COVID-19 vaccine. Healthcare leadership should strongly endorse the significance of vaccinations, encouraging administrators and department heads to set a positive example. On-site vaccination clinics should be established in healthcare facilities, offering flexible scheduling and incentives. Establish a long-term monitoring system to track vaccination adverse effects and complications and the acceptance of annual COVID-19 booster vaccines by HCWs. Regularly assess and adapt strategies based on changing perceptions and needs. Further research is needed to identify and address specific vaccine concerns and build trust among HCWs.

Availability of data and materials

The datasets supporting the conclusions of this article are included within the article and its additional files.

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Acknowledgements

We thank all of the Palestinian HCWs who participated in the study for their time and effort.

Funding

The authors did not receive support from any organization for the submitted work.

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Authors

Contributions

ZN and YE contributed to the idea conception and the study design. ZN and BM designed the methods, supervised data collection analysis, and wrote the first draft of the manuscript. MD, TJ, and HB contributed to data collection and analysis. All authors interpreted the results and commented on previous versions of the manuscript. All authors read and approved the final manuscript and have agreed to submit it to the journal.

Corresponding authors

Correspondence to Zaher Nazzal or Yousef El Hamshary.

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Ethics approval and consent to participate

All procedures performed in this study have followed the Declaration of Helsinki. The study was approved by the Institutional Review Board of An-Najah National University [Ref #: Farm. Med. August 2022/26].

All subjects involved in the study were invited to participate voluntarily, and informed consent was obtained from all participants.

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Not applicable.

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The authors declare no competing interests.

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Maraqa, B., Nazzal, Z., Baroud, H. et al. Healthcare workers' attitudes toward and factors influencing their acceptance of an annual COVID-19 booster vaccine: a cross-sectional study in Palestine. BMC Health Serv Res 24, 624 (2024). https://doi.org/10.1186/s12913-024-11016-w

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