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Factors effecting influenza vaccination uptake among health care workers: a multi-center cross-sectional study

  • Süheyl Asma1Email author,
  • Hülya Akan2,
  • Yücel Uysal3,
  • A. Gürhan Poçan1,
  • Mustafa Haki Sucaklı4,
  • Erhan Yengil5,
  • Çiğdem Gereklioğlu1,
  • Aslı Korur1,
  • İbrahim Başhan3,
  • A. Ferit Erdogan1,
  • A. Kürşat Özşahin1 and
  • Altuğ Kut1
Contributed equally
BMC Infectious DiseasesBMC series – open, inclusive and trusted201616:192

https://doi.org/10.1186/s12879-016-1528-9

Received: 17 October 2015

Accepted: 28 April 2016

Published: 4 May 2016

Abstract

Background

The present study aimed to identify factors affecting vaccination against influenza among health professionals.

Methods

We used a multi-centre cross-sectional design to conduct an online self-administered questionnaire with physicians and nurses at state and foundation university hospitals in the south-east of Turkey, between 1 January 2015 and 1 February 2015. The five participating hospitals provided staff email address lists filtered for physicians and nurses. The questionnaire comprised multiple choice questions covering demographic data, knowledge sources, and Likert-type items on factors affecting vaccination against influenza. The target response rate was 20 %.

Results

In total, 642 (22 %) of 2870 health professionals (1220 physicians and 1650 nurses) responded to the questionnaire. Participants’ mean age was 29.6 ± 9.2 years (range 17–62 years); 177 (28.2 %) were physicians and 448 (71.3 %) were nurses. The rate of regular vaccination was 9.2 % (15.2 % for physicians and 8.2 % for nurses). Increasing age, longer work duration in health services, being male, being a physician, working in an internal medicine department, having a chronic disease, and living with a person over 65 years old significantly increased vaccination compliance (p < 0.05). We found differences between vaccine compliant and non-compliant groups for expected benefit from vaccination, social influences, and personal efficacy (p < 0.05). Univariate analysis showed differences between the groups in perceptions of personal risks, side effects, and efficacy of the vaccine (p < 0.05). Multivariate analysis found that important factors influencing vaccination behavior were work place, colleagues’ opinions, having a chronic disease, belief that vaccination was effective, and belief that flu can be prevented by natural ways.

Conclusion

Numerous factors influence health professionals’ decisions about influenza vaccination. Strategies to increase the ratio of vaccination among physicians and nurses should consider all of these factors to increase the likelihood of success.

Keywords

Influenza Vaccination behavior Healthcare workers

Background

Influenza is a contagious disease associated with yearly seasonal outbreaks and significant mortality among risk groups [1]. During outbreaks, health professionals are repeatedly exposed to the influenza virus, and generally continue working even when infected. As the disease is often asymptomatic, health professionals can further spread the virus to their patients and families [24]. It has been demonstrated that the administration of influenza vaccine to health professionals is a cost-effective strategy that reduces lost work hours, as well as nosocomial transmission and mortality among hospitalized patients [58]. Previous studies have suggested that physicians who are vaccinated are more likely to recommend the influenza vaccine to their patients, and physician and nurse attitudes are important factors influencing patients’ decisions about vaccination [9, 10].

Similarly to Europe, Turkey has a low ratio of vaccination against influenza [1113]. The targeted vaccination ratio was 45.5 % among health care workers (HCWs) in 2011, with a goal of increasing this ratio to 90 % by 2020 [14].

It is important to understand the attitudes and behaviors of health professionals toward vaccination to develop strategies to improve vaccination rates of health professionals and other individuals. There are a limited number of studies that have investigated the vaccination rates and vaccination status of health professionals, with data particularly limited in Turkey. The majority of the available studies are focused on specific areas or hospitals. Factors affecting decisions about getting vaccinated or not may change from country to country, especially in terms of social and organizational factors.

The present study aimed to investigate the attitudes and behaviors toward influenza vaccination, and factors influencing vaccination behavior of health professionals working in the south-eastern region of Turkey. Based on previous data, we focused our investigation on factors such as years worked, age, gender, sources of knowledge, health status, severity of perceived risks, perceived benefits, perceived barriers, motivating factors, attitudes, social effects, and personal efficacy.

Methods

The present cross-sectional study was conducted between 1 January 2015 and 1 February 2015 using a self-report questionnaire.

The study population consisted of nurses and physicians who were working in university hospitals in the south-eastern region of Turkey, and who agreed to participate and gave informed consent. There are six university hospitals in the study region, and a total of 3650 health professionals (1551 physicians and 2099 nurses) were invited to participate. One university hospital did not participate, meaning five university hospitals (Baskent University Adana Hospital, Mersin University, Hatay Mustafa Kemal University, and Kahramanmaraş Sutcu Imam University) were enrolled in the study. This gave a sample of 2870 health professionals (1220 physicians and 1650 nurses). Staff email address lists were filtered for physicians and nurses by the five participating hospitals and provided to the present researchers. All health professionals were contacted via email and asked to complete the questionnaire electronically. Questionnaires were sent to participants three times during the study. The targeted minimum response rate was 20 %.

The questionnaire comprised two sections. The first section included multiple-choice questions concerning demographic characteristics such as age, gender, occupation, years worked in health services, and the institute and department in which the participant worked. Intensive care units, surgical areas and emergency medicine units accepted as “high risk areas”. Vaccination status has been asked as “Do you vaccinate against influenza?” The anwer choices were “I have never vaccinated”, “I have vaccinated before but I do not vaccinate every year” and “I regularly vaccinate every year”. HCWs answering “I regularly vaccinate” accepted “vaccine compliant” and others accepted “vaccine non-compliant”.

The second section focused on influenza vaccination, and covered behavioral factors assessed by five-point Likert-type questions of total 50 questions. The answers were expressed as: 1 is “I strongly agree”, 2 is “I agree”, 3 is “neutral”, 4 is “I disagree”, 5 is “I strongly disagree”. The questions were adapted from a previous study conducted among primary care health workers in 2015 (Akan et al., unpublished). In that study a questionnaire have been prepared based on studies and approach of Looijmans-Van den Akker et al. and Hopman et al. and relevant Turkish literature and recommendations from the Ministry of Health [15, 16]. The present researchers used a consensus-based approach to further adapt questionnaire items to secondary and tertiary health professionals, and the content of some items were changed. The primary domains of this section of the questionnaire were the severity of the perceived risks, perceived benefits, perceived barriers, motivating factors, attitudes, social effects, and personal efficacy. The Cronbach’s alpha coefficient for the questionnaire was calculated as 0.92 in a pilot study conducted with 35 physicians and nurses at Baskent University.

We asked participants about the status of regular vaccination to assess vaccination compliance. Participants who reported having been regularly vaccinated were considered as the vaccination compliant group, and those who had never been vaccinated or vaccinated only once were considered to be the vaccination non-compliant group.

Statistical analysis

Categorical variables were summarized by number and percentage, and continuous variables were described by mean, standard deviation (SD), median, inter-quartile range, minimum, and maximum. The vaccination compliant and non-compliant groups were compared using Mann Whitney U tests due to a non-normal distribution pattern for continuous variables. Categorical variables were compared using chi-square or Fisher’s exact tests.

Estimating effects of independent variables on vaccination habits were evaluated with univariate logistic regression models. Variables had statistically significant estimating effect on vaccination habits (p < 0.10) were included to mutually adjusted multivariate logistic models and results of the model with the best Bayesian information criterion (BIC) value were reported. Regression results were summarized with odds ratio (OR), 95 % confidence interval (CI) boundaries of the OR, and P values.

The type 1 error level was set at 0.05, as the hypothesis was two-sided. Analyses were performed on SPSS software version 21.0 (IBM SPSS Statistics for Windows, Version 21.0. Armonk, NY: IBM Corp.).

We obtained ethics committee approval from Baskent University (project number: KA 15/08).

Results

Responses were received from 642 to 2870 health professionals, giving a response rate of 22.4 %. In total, 628 subjects were included in the analysis; 14 participants were excluded as they did not respond to the question about vaccination habits. The mean age of the participants was 29.6 ± 9.2 years (range 17–62 years); 177 (28.2 %) were physicians and 448 (71.3 %) were nurses, 406 (64.6 %) were female and 218 (34.7 %) were male. Of the participants, 397 (63.28 %) were from Adana, 149 (23.7 %) were from Kahramanmaras, 47 (7.5 %) were from Mersin, and 34 (5.4 %) were from Hatay.

The ratio of participants who are vaccine compliant was 9.2 % (15.2 % of physicians and 8.2 % of nurses). When the ratio of the participants was evaluated with regard to departments, the highest vaccination ratio was found among internal medicine workers (53.4 %) followed by surgery departments (25.9 %), intensive care unit workers (10.3 %), emergency department workers (5.2 %) and others (1.7 %). The vaccination rate difference between health care professionals working in high-risk areas and low risk areas was statistically significant (p < 0.05) and was higher in people working in low risk areas.

Univariate analysis

Univariate logistic regression analysis showed (Table 1, Table 2)

Table 1

Demographic characteristics and knowledge sources of health professionals

Participant opinions

Vaccination compliant (n = 58)a

Vaccination non-compliant (n = 570)a

P

Demographics

 Age (years)

36.6 (±9.8)

28.9 (±8.2)

<0.0001

 Gender (male)

28/58 (48.3 %)

190/570 (33 %)

0.025

 Working years

13.1 (±8.4)

6.5 (±6.5)

<0.0001

Influenza related risk factors

 Having a chronic disease

7/49 (14.2 %)

13/546 (2.4 %)

0.001

 Living with a high risk person

 Living with a child aged <2 years

17/58 (29.3 %)

156/570 (27.4 %)

0.752

 Living with a person with a chronic disease

22/58 (37.9 %)

231/570 (40.5 %)

0.701

 Living with a person aged >65 years

22/58 (37.9 %)

122/570 (21.4 %)

0.004

 Living with a pregnant woman

7/58 (12.1 %)

78/570 (13.7 %)

0.732

Current information sources

 Newspaper and television

25/58 (43.1 %)

320/570 (56.1 %)

0.057

 Social media

17/58 (29.3 %)

267/570 (46.8 %)

0.011

 Health institutes

29/58 (50 %)

347/570 (60.9 %)

0.107

 Ministry of Health website

20/58 (34.5 %)

202/570 (35.4 %)

0.885

 Health websites

17/58 (29.3 %)

188/570 (33 %)

0.570

 WHO and CDC websites

24/58 (41.4 %)

112/570 (19.6 %)

0.0001

 Flu platform

7/57 (12.1 %)

48/570 (8.4 %)

0.349

 Colleagues

27/58 (46.6 %)

287/570 (50.4 %)

0.581

 No information received

1/58 (1.7 %)

53/570 (9.3 %)

0.049

Preferred information source

 Newspaper and television

21/58 (36.2 %)

231/570 (40.5 %)

0.523

 Social media

14/58 (24.1 %)

206/570 (36.1 %)

0.068

 Health institutes

35/58 (60.3 %)

367/570 (64.4 %)

0.541

 Ministry of Health website

27/58 (46.6 %)

300/570 (52.6 %)

0.337

 Health websites

19/58 (32.8 %)

186/570 (32.6 %)

0.984

 WHO and CDC websites

26/58 (44.8 %)

197/570 (34.6 %)

0.120

 Via e-mail

23/58 (39.7 %)

194/570 (34 %)

0.391

 Flu platform

14/58 (24.1 %)

115/570 (20.2 %)

0.477

 Via mail to personal address

13/58 (22.4 %)

120/570 (21.1 %)

0.830

*p value for comparisons

aNumber of participants strongly agreeing or agreeing / total number of responses (percentage strongly agreeing or agreeing)

Table 2

Univariate analysis: behavioral determinants associated with influenza vaccine uptake among health professionals

Participant opinions

Vaccine compliant (n = 58)a

Vaccine non-compliant (n = 570)a

Odds ratio (95 % CI)

P

Perceived risk

 I have high risk for influenza

53/56 (94.6 %)

409/568 (72 %)

6.87 (2.12–22.30)

0.001

 I can spread infection to my patients even if I am asymptomatic

46/56 (82.1 %)

352/566 (62.2 %)

2.80 (1.38–5.66)

0.004

 Health professionals are under the highest risk in case of an epidemic

54/56 (96.4 %)

512/567 (90.3 %)

2.90 (0.69–12.22)

0.147

 I can spread infection to my family even if I am asymptomatic

39/56 (69.6 %)

325/564 (57.6 %)

1.69 (0.93–3.05)

0.084

Severity of the perceived risk

 Influenza is dangerous for me

46/57 (80.7 %)

388/561 (69.2 %)

1.86 (0.94–3.69)

0.073

 Influenza is dangerous for my patients

50/56 (89.3 %)

501/559 (89.6 %)

0.96 (0.40–2.35)

0.937

 Influenza is dangerous for my family

52/57 (91.2 %)

478/564 (84.8 %)

1.87 (0.73–4.82)

0.194

Perceived benefit

 Vaccination reduces my personal risk

56/57 (98.2 %)

367/565 (65 %)

30.21 (4.15–219.90)

0.001

 Vaccination reduces the risk of spreading the disease to my patients

53/55 (96.4 %)

373/561 (66.5 %)

13.36 (3.22–55.40)

<0.001

 Vaccination reduces the risk of spreading the disease to my family

53/56 (94.6 %)

372/568 (65.5 %)

9.31 (2.87–30.17)

<0.001

 Community vaccination reduces my workload during an epidemic

52/55 (94.5 %)

382/562 (68.0 %)

8.17 (2.52–26.51)

<0.001

Perceived barriers

 I don’t expect a side effect after vaccination

29/56 (51.8 %)

183/563 (32.5 %)

2.23 (1.28–3.88)

0.004

 The inactive influenza vaccine currently available in our country is effective

46/56 (82.1 %)

204/557 (36.6 %)

7.96 (3.93–16.11)

<0.001

 Allergic reaction against influenza vaccine is rare, or none

42/57 (73.7 %)

190/561 (33.9 %)

5.47 (2.96–10.11)

<0.001

 Autoimmune disease development risk is rare, or none, after influenza vaccine

40/57 (70.2 %)

189/566 (33.4 %)

4.69 (2.59–8.50)

<0.001

 I am not against vaccination

51/56 (91.1 %)

433/562 (77.0 %)

3.04 (1.19–7.77)

0.020

 Need for vaccination every year negatively effects my regular vaccination

30/54 (55.6 %)

237/549 (43.2 %)

1.65 (0.94–2.89)

0.083

 One can catch influenza even if vaccinated

49/55 (89.1 %)

451/557 (81.0 %)

1.92 (0.80–4.60)

0.144

 I had side effects from my previous influenza vaccinations

21/57 (36.8 %)

133/553 (24.1 %)

1.84 (1.04–3.27)

0.036

 The influenza vaccine itself does not cause influenza

26/56 (46.4 %)

215/557 (38.6 %)

1.38 (0.79–2.39)

0.254

 Health professionals should be vaccinated even if patients have been vaccinated

50/56 (89.3 %)

327/562 (58.2 %)

5.99 (2.53–14.20)

<0.001

 I find injection every year uncomfortable

27/55 (49.1 %)

285/563 (50.6 %)

0.94 (0.54–1.64)

0.828

 Vaccination does not reduce the overall immunization

39/56 (69.6 %)

330/564 (58.5 %)

1.63 (0.90–2.95)

0.108

 I believe the vaccines are useful

52/55 (94.5 %)

432/562 (76.9 %)

5.22 (1.60–16.98)

0.006

 I believe in alternative medicine

40/56 (71.4 %)

396/561 (70.6 %)

1.04 (0.57–1.91)

0.895

 I believe that natural methods are better than vaccination

23/55 (41.8 %)

379/562 (67.4 %)

0.35 (0.20–0.61)

<0.001

 I am against vaccination due to my beliefs

6/54 (11.1 %)

111/563 (19.7 %)

0.51 (0.21–1.22)

0.130

Motivating factors

 I know the Ministry of Health recommendations about influenza vaccination

45/55 (81.8 %)

359/561 (64.0 %)

2.53 (1.25–5.13)

0.010

 I know the Ministry of Health recommendations about the age groups and chronic diseases which require influenza vaccination

44/55 (80.0 %)

318/564 (56.4 %)

3.09 (1.57–6.12)

0.001

 I have sufficient knowledge about influenza

47/55 (85.5 %)

408/561 (72.7 %)

2.2 (1.02–4.77)

0.045

 I get knowledge about influenza from reliable sources every year

43/56 (76.8 %)

310/561 (55.3 %)

2.68 (1.41–5.09)

0.003

 The Ministry of Health provides free vaccination for health professionals

41/55 (74.5 %)

310/561 (55.3 %)

2.37 (1.26–4.45)

0.007

Attitudes

 I feel that health professionals’ not spreading the disease to their patients important

53/57 (93.0 %)

480/562 (85.4 %)

2.26 (0.80–6.42)

0.125

 I believe that health professionals should be vaccinated for the continuity of health services

51/56 (91.1 %)

363/557 (65.2 %)

5.45 (2.14–13.88)

<0.001

 Right of choice for vaccination should be preserved for health professionals

43/57 (75.4 %)

480/557 (86.2 %)

0.49 (0.26–0.94)

0.033

 Influenza vaccine should be mandatory for health professionals

36/56 (64.3 %)

193/557 (34.6 %)

3.39 (1.91–6.03)

<0.001

Social effects

 My relatives believe that my vaccination is important

48/57 (84.2 %)

252/560 (45 %)

6.52 (3.14–13.54)

<0.001

 My institute recommends my vaccination

46/57 (80.7 %)

284/560 (50.7 %)

4.06 (2.06–8.01)

<0.001

 My colleagues believe that my vaccination is important

47/56 (83.9 %)

250/558 (44.8 %)

6.43 (3.09–13.38)

<0.001

 The Ministry of Health recommends vaccination of health professionals

44/55 (80.0 %)

325/554 (58.7 %)

2.82 (1.43–5.57)

0.003

 The health authorities I respect recommend vaccination

46/55 (83.6 %)

292/553 (52.8 %)

4.57 (2.19–9.51)

<0.001

Personal competence

 I would be vaccinated every year if I have enough time

48/53 (90.6 %)

194/373 (52.0 %)

8.86 (3.45–22.75)

<0.001

 I would be vaccinated if someone reminds me

49/57 (86.0 %)

194/555 (35.0 %)

11.4 (5.29–24.55)

<0.001

 I would be vaccinated every year if the vaccine is provided in my institute

50/55 (90.9 %)

208/557 (37.3 %)

16.78 (6.59–42.75)

<0.001

 I would be vaccinated every year if I am rewarded

29/56 (51.8 %)

144/558 (25.8 %)

3.09 (1.77–5.39)

<0.001

 I would be vaccinated every year if sufficient knowledge was given

47/56 (83.9 %)

253/555 (45.6 %)

6.23 (3.00–12.97)

<0.001

CI 95 % confidence interval of odds ratio, P p value for odds ratio

aNumber of participants strongly agreeing or agreeing/total number of responses (percentage strongly agreeing or agreeing)

The median age (35.5 years) of the group who were vaccine compliant was significantly higher than the median age (26.0 years) of those vaccine noncompliant (p < 0.0001). The proportion of females (51.7 %) in the compliant group was significantly lower than that (66.0 %) in the non-compliant group (p = 0.025). The proportion of physicians (48.3 %) in the compliant group was significantly higher than that (26.1 %) in the non-compliant group (p = 0.0004). The median years worked in health services for the compliant group (13.1 years) was significantly higher than that (6.5 years) of the non-compliant group (p < 0.0001). In the compliant group, the percentage of respondents with a chronic disease who required vaccination (12.1 %) was significantly higher than that (2.3 %) in the non-compliant group (p = 0.001). The proportion of participants living with a person older than 65 years (37.9 %) in the compliant group was significantly higher than that (21.4 %) in the non-compliant group (p = 0.004).

Multivariate logistic regression analysis

As there were a small number of health professionals who were regularly vaccinated each year and all factors could not be included in the multiple regression analysis, we created a corrected multiple logistic regression model with the variables chosen through preliminary methods. Variables with p < 0.10 were included in the main multivariate regression analysis. So at the end, variables “the institution in which the participant worked”, “presence of a chronic disease that required influenza vaccine”, “colleagues think vaccination is important”, “the inactive influenza vaccine currently available in our country is effective”, “fighting influenza with natural methods is more effective than vaccination with regard to overall health” are included. Model has 91.3 % accuracy for likelihood of regular vaccination every year.

Working at Başkent University Adana Hospital, Kahramanmaraş Sütcü İmam University (reference: working at Mersin University) decreased the likelihood of regular vaccination every year by 0.25, 0.18, times respectively; estimating effect of working at Mustafa Kemal Universty was not statistivally significant. Having a chronic disease that required vaccination increased the likelihood of regular vaccination every year by 5.13 times. Strongly agreeing or agreeing that colleagues thought vaccination is important increased the likelihood of regular vaccination every year by 3.45 times. Strongly agreeing or agreeing that the inactive flu vaccine currently available in Turkey is effective increased the likelihood of regular vaccination every year by 6.31 times. Strongly agreeing or agreeing that protection with natural methods against flu is better than vaccination for overall health status decreased the likelihood of regular vaccination every year by 0.38 times.

Discussion

This study has shown that increasing age, increasing working years, having chronic disease and living with a person over 65 years are important and positively affecting factors to be vaccinated against seasonal influenza. In all behavioral domains there are differences between vaccine compliant and non-compliant groups; nearly all sub-items of perceived risk, perceived benefit, social effects and personal competence differed between groups. Also, knowing the recommendations of MoH, the thoughts of collegues, getting knowledge from reliable sources and thinking that “natural methods are better than vaccine to fight against flu” seem important factors affecting HCWs vaccination behavior. There were also differences between hospitals.

Recommendations about indications for influenza vaccine and reimbursement for vaccination vary between countries, and vaccination of health professionals has a similar variance. While influenza vaccine is recommended for health professionals and is provided free of charge in some countries, in other countries, vaccination is mandatory for health professionals in certain specialties [17, 18]. In Turkey, risk groups for influenza vaccination were identified in 2004, and the Ministry of Health has provided the vaccine to health care workers free of charge since 2011 to motivate health professionals to get vaccinated.

With the exception of Romania, where vaccination rates are high, vaccination rates vary from 14 to 15 % in European countries and are under the targeted rates [11, 14, 1922]. Rates of influenza vaccination are also low in the general population in Turkey [12, 13].

Although the present study was not conducted with a selected sample, vaccination rates were low among participants who were regularly vaccinated, particularly nurses. Another striking finding was lower vaccination rates among health professionals who have more contact with critically ill patients.

Although previous studies used different methods, factors influencing vaccination behavior common to previous research and our study were demographic factors (age, working years, and presence of a chronic disease), risk perception, expected benefit, incorrect information and attitudes about the vaccine, social factors, and organizational insufficiencies [15, 2325]. Institutional sufficiency may be important since there are differences between institutes in our study. The institutions included in the study, HCWs are informed by e-mail regarding influenza vaccine at the beginning of the winter and provide information about vaccine form their official web-sites also. Also, in Baskent University a nurse responsible from monitoring influenza vaccination among HCWs, inform workplace physician and head of departments by telephone. Still, there are some differences between institutions regarding implementation of flu vaccine which may explain the differences in vaccine compliance regarding workplace.

In our study, while risk perception changed vaccination status, perceived risk severity was high in both the compliant and non-compliant groups and this did not lead to a difference in vaccination behavior. There were significant differences in all components of the expected benefits, and the perception of expected benefits was clearly low in the non-compliant group. Another interesting finding was that although health professionals reported that their knowledge about the vaccine was sufficient, a high proportion of participants believed that the vaccine itself could cause influenza and side effects. The influenza vaccine currently available in Turkey is a trivalent inactive vaccine that is not likely to lead to influenza. Side effects of the vaccine are rare and the common side effects are no different than for other vaccines. We found that incorrect information and attitudes influenced vaccination behavior despite an individual’s belief that they had sufficient knowledge.

Another important factor affecting vaccination behavior was protecting the individual’s family and environment. This is also part of professional life for healthcare workers. Although do good for others is a good motivator this reason alone was not always reflected in vaccination behavior; Individuals decide to get vaccinated if others can benefit from their vaccination if their personal risk of vaccination was low; not vaccinated if their risk is high. In addition, time concerns and costs also played important roles in vaccination decision-making [26, 27].

There are many factors that affect behavior of vaccination against influenza. Many strategies have been proposed to improve the vaccination rates of health professionals. The most effective strategy seems to be making vaccination mandatory which has been implemented in some countries as United States succesfully 2015 survey has shown that the highest vaccination coverage was reported among HCW with an employer requirement for vaccination [28]. However, this strategy is controversial with regard to ethical concerns. While those who advocate mandatory vaccination propose that this is part of physicians’ professional responsibility to do no harm, the opponents claim that physicians’ self-rule should be preserved [2730]. Although mandatory vaccination increases vaccination rates, it is negatively perceived by health professionals and this view should be respected [31]. Interestingly in our study, although the compliant group expressed more support, even in non-compliant group 34.6 % of HCWs support mandatory vaccination. Interventional studies in the literature are limited, and the majority of available studies focus on evaluating information and education [32].

Although having sufficient knowledge about influenza and vaccination has been shown to be an important factor in addressing incorrect knowledge and beliefs about the vaccine, and the need for education has been emphasized, many studies have shown that sufficient knowledge alone was not enough to changing vaccination behavior [10, 26, 3336]. One study showed that physicians’ analytic knowledge was no different from that of the general population when risk perception was low, and physicians’ attitudes were no different from the general population when risk perception was high; their behavior was affected by their experiences and feelings [37]. Other studies have also shown that physicians’ behaviors with regard to their own health are similar to those of the general population [26].

Single interventions such as providing information or providing vaccination free of charge have been found to not influence vaccination behavior [35, 36]. Strategies targeting multiple interventions that are based on a comprehensive assessment seem to be more successful [3739].

Our study has some limitations. First, the ratio of participation in our study was relatively low. Second, the study was conducted in one region and included only physicians and nurses so the results cannot be assumed to represent all healthcare workers in Turkey. Third, there was a possibility of bias due to participants with favorable attitudes towards influenza vaccination potentially being more likely to have responded to the study questionnaire or vica versa. Fourth, omitting free-text response options about factors affecting vaccination behaviors may have resulted in factors that were not included in the questionnaire being missed. However, the main goal of the present study was to identify factors that influence the decisions of health professionals about influenza vaccination. In this context, we believe that the findings of the present study may serve as a guide for the development and implementation of national-level strategies intended to increase the ratio of vaccination.

Conclusions

There are numerous factors that influence the decisions of health professionals regarding influenza vaccination. Strategies aimed to increase the ratio of vaccination among physicians and nurses that consider all of these factors are more likely to be successful. In the planning and implementation of strategies to increase the ratio of vaccination among health professionals, it is necessary and important to consider changeable factors relating to individual behavior, as well as organizational factors.

Ethics and consent to participate

This study was approved by the Institutional Medical and Health Sciences Experimental/Clinical Research Principles and Research Committee (project number: KA15/08). The required approvals for the collaborations in the study were obtained from the concerned departments and hospitals. The participants were informed about the objcetive and the moethod of the study and they were accepted to consent if they filled out the questionnaire form.

Consent to publish

Not applicable.

Availability of data and materials

Identifying/confidential patient data should not be shared.

Notes

Abbreviations

CI: 

confidence interval

HCWs: 

health care workers

OR: 

odds ratio

SD: 

standard deviation

Declarations

Acknowledgments

The authors would like to express their sincere thanks to the following: the experts who contributed study design, namely Prof. Hakan Ozdogu, Prof. Can Boga from Hematology Department of Baskent University; the head nurse of Baskent University who motivated participation of the nurses, namely Ulviye Burkas; and all physicians and nurses who voluntarily participated in the study from all institutions.

Funding

This study was not financially supported. Statistical analysis has been funded by Sanofi-Pasteur and has been done by Kappa, a private company of education, reseach and consulting. The funder had no role in study design, data collection and analysis, decision to publish, or manuscript writing and was blind to whole study.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
Department of Family Medicine, Başkent University Faculty of Medicine
(2)
Department of Family Medicine, Yeditepe University Faculty of Medicine
(3)
Department of Family Medicine, Mersin University Faculty of Medicine, Çiftlikköy Kampusu
(4)
Department of Family Medicine Sütçü İmam University Faculty of Medicine, Avşar Kampüsü
(5)
Department of Family Medicine, Mustafa Kemal University Faculty of Medicine

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Copyright

© Asma et al. 2016

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