http://orcid.org/0000-0002-2480-4586
Figures
Abstract
Background and aim
Vietnam’s burden of liver cancer is largely due to its high prevalence of chronic hepatitis B virus (HBV) infection. This study aimed to examine healthcare workers’ (HCWs) knowledge, attitude and practices regarding HBV prevention and management.
Methods
A cross-sectional survey among health care workers working at primary and tertiary facilities in two Northern provinces in Vietnam in 2017. A standardized questionnaire was administered to randomly selected HCWs. Multivariate regression was used to identify predictors of the HBV knowledge score.
Results
Among the 314 participants, 75.5% did not know HBV infection at birth carries the highest risk of developing chronic infection. The median knowledge score was 25 out of 42 (59.5%). About one third (30.2%) wrongly believed that HBV can be transmitted through eating or sharing food with chronic hepatitis B patients. About 38.8% did not feel confident that the hepatitis B vaccine is safe. Only 30.1% provided correct answers to all the questions on injection safety. Up to 48.2% reported they consistently recap needles with two hands after injection, a practice that would put them at greater risk of needle stick injury. About 24.2% reported having been pricked by a needle at work within the past 12 months. More than 40% were concerned about having casual contact or sharing food with a person with chronic hepatitis B infection (CHB). In multivariate analysis, physicians scored significantly higher compared to other healthcare professionals. Having received training regarding hepatitis B within the last two years was also significantly associated with a better HBV knowledge score.
Citation: Hang Pham TT, Le TX, Nguyen DT, Luu CM, Truong BD, Tran PD, et al. (2019) Knowledge, attitudes and medical practice regarding hepatitis B prevention and management among healthcare workers in Northern Vietnam. PLoS ONE 14(10): e0223733. https://doi.org/10.1371/journal.pone.0223733
Editor: Hans Tillmann, Duke University, UNITED STATES
Received: June 19, 2019; Accepted: September 26, 2019; Published: October 14, 2019
Copyright: © 2019 Hang Pham et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Data Availability: All relevant data are within the manuscript and its Supporting Information files.
Funding: The authors received no specific funding for this work.
Competing interests: The authors have declared that no competing interests exist.
Introduction
Hepatitis B virus (HBV) is a serious global public health problem that can cause chronic infection and puts people at risk for premature death from cirrhosis and liver cancer. There is an estimated 257 million people living with chronic hepatitis B infection (CHB) in the world [1]. Asia and sub-Saharan Africa bear most of the burden of CHB, accounting for more than three quarters of the people with CHB in the world [2]. According to the 2016 Global Burden of Disease’s study, chronic HBV infection accounts for about 42% of all liver cancer deaths [3].
Vietnam has one of the highest prevalence of CHB. Hepatitis B surface antigen (HBsAg) prevalence were reported to be as high as 15–20% in the general population [4–7] with an estimated 9.6 million people living with CHB [8]. Each year an estimated 23,300 people in Vietnam die from hepatitis B related complications [9] and HBV- related liver cancer cases is projected to reach 58,600 by 2025, a 60% increase from 2005 [9]. Despite the inclusion of the hepatitis B vaccine in the expanded national infant immunization program since 2002, HBV continues to be a leading cause of mortality in Vietnam. Liver cancer ranked the third leading cause of cancer death in Vietnam in 2018, only after lung and stomach cancer [10]. Vietnam also ranks 5th in liver cancer mortality rate in the world [11]. Mathematical models predicted that Vietnam would continue to face an enormous burden of HBV-related liver disease in the future [9]. As perinatal transmission is the main cause of CHB in Vietnam, improving newborn hepatitis B vaccination coverage, particularly the birth dose given within 24 hours after delivery, is critical to eliminate mother-to-child transmission.
In 2015, Vietnam approved the first comprehensive national action plan for prevention and control of viral hepatitis that calls for concerted actions, including vaccination, prevention, testing and treatment of CHB [12]. In this plan, building the capacity of healthcare workers (HCWs) was identified as one of the pillars in the national strategies to prevent new HBV infection and reduce the complications of CHB. This study sought to assess the knowledge, attitudes, and medical practices of HCWs regarding HBV prevention and management. The findings from this survey will help to inform targeted training programs to build capacity of HCW to eliminate new HBV infections and reduce the burden of CHB and liver cancer.
Methods
Study population
This was a cross sectional study conducted from February through August 2017. Two provinces were selected from the list of 25 Northern provinces, representing the Northern Midlands and Mountains (Hoa Binh) and the Red River Delta (Quang Ninh). Fifteen public health clinics including two provincial hospitals, five district health clinics and eight commune health centers were selected for this study. All health care workers who provided health care to patients were eligible. The Scientific Research Committee of The Vietnam Family Planning Association reviewed and approved the study’s protocol and ethical clearance (reference number: 052017/HD5). Eligible HCWs were provided oral information about the study’s background, purposes and procedure. Only those who gave a written consent were included in the study.
The sample size was calculated using a single population proportion formula considering the following assumptions: the prevalence of HCWs who have correct knowledge and practice about hepatitis B prevention and management is 50%, a confidence interval of 95%, and a margin of error of 5%. The sample size was calculated to be 380. Because the total number of health care workers working in participating facilities is less than 10,000, we used correction formula and factored in an assumed non-response rate of 10%. The final sample size was 322. Number of study participants recruited at each clinic was proportional to its number of HCWs. Study participants were selected randomly from the list of HCWs.
Questionnaire
The questionnaire was developed in Vietnamese based on the Asian Liver Center at Stanford University’s prior experiences in HBV knowledge surveys in HCWs [13–15]. The questionnaire was pre-tested on seven volunteer HCWs to test the questions’ language, flow and comprehension. After the pre-test, a few wording modifications were made so as the questions were interpreted as intended. It took a approximately 25 minutes to complete each interview. There were 42 questions on HBV knowledge (questions 8–26, 29–31, 37–42, 44–57), three questions on HBV attitudes (questions 61–63), and five questions on medical practices (questions 27, 28, 32–34) (See S1 File).
The Vietnam General Department of Preventive Medicine recruited and trained ten research assistants who were not affiliated with the participating health clinics to administer the questionnaire. Completed questionnaires were kept in locked cabinets and only be accessible to the study investigators.
Statistical methods
The STATA 12.0 statistical software was used for data analysis. Basic descriptive statistics were generated from variables in the dataset. Continuous data were expressed as mean ± standard deviation (SD) and median (min-max), while categorical variables were expressed as proportions (%). HBV knowledge score was calculated based on the sum of correct answers to the 42 knowledge-based questions. A correct response to each question was given one point. Incorrect or missing responses received no points. First, univariate linear regression was performed to measure the association between HBV knowledge score and demographic factors (i.e., age, gender, occupation, specialties, level of facilities, and year of experience), previous experience with HBV (immunization, being tested for hepatitis B and having encountered with CHB patients), and whether the HCW received training on HBV in the past two years. Only the variables with p value <0.25 in univariate analysis were included into multivariate analysis [16]. Regression coefficients and their 95% confidence intervals (CIs) were used to provide a further clue regarding the relative importance of each independent variable on the outcome variable. Degree of statistical significance was declared at a p value ≤ 0.05.
Results
Demographics and HBV related experience of survey participants
Among the 322 HCWs that were approached, 314 agreed to participate in the study, giving a response rate of 97.5%. Characteristics of the study population (N = 314) are presented in Table 1. The ratio of male to female participants was 34:66 and 68.8% were between 25–45 years old. Majority of the HCWs (74.5%) have encountered CHB patients in the past. 81.2% reported they themselves had been tested for hepatitis B and 68.8% have received the hepatitis B vaccine. Nearly half of the participants (45.9%) reported having received training on HBV prevention, diagnosis or management within the last two years.
Knowledge about HBV risk, prevention, and management
A total of 42 knowledge-based questions were used to assess HBV knowledge categories including prevalence, health risks, transmission, prevention, diagnosis, management and treatment as well as injection safety (Table 2). Majority of the participants (74.6%) were aware that CHB can cause serious complications such as liver cirrhosis, liver failure, liver cancer or premature death. About 41.4% provided the correct answer to the estimated prevalence of CHB in Vietnam. Only 39.5% were aware that mother-to-child transmission at birth is the most common cause of CHB in Vietnam, and only 24.5% were aware that newborns who become infected are at the highest risk of developing CHB (Table 2).
Most of the participants were aware that HBV can be transmitted through mother-to-child at birth (90.1%), unprotected sex (85.4%), and blood transfusion (88.9%). However, almost a third (30.2%) wrongly believed that HBV can be transmitted through eating with or sharing utensils with HBV infected patients, and 18.1% believed that HBV can be transmitted through sneezing or coughing. Almost half of the participants (49.4%) wrongly believed that cleaning and cooking food thoroughly can prevent HBV transmission, and 44.3% believed avoiding sharing food and eating utensils or eating with person with CHB can prevent HBV transmission. While the majority of participants (91.1%) were aware that HBV transmission can be prevented by hepatitis B vaccination, only 73.6% provided correct answers to the questions who should be vaccinated against hepatitis B. Only 61.2% were confident that the hepatitis B vaccine is very safe (Table 2).
Knowledge about injection safety was assessed by three questions (Table 2). Only about half of the respondents (50.6%) knew they should not recap the needle with two hands to prevent needle stick injury, and they should dispose of the used needle and syringe into a sharp container immediately without recapping the needle (47.1%).
Few (13.7%) were aware that patients with CHB often have no symptoms, and only 22.0% knew without proper monitoring and treatment, CHB carries up to a 25% risk of death from liver cancer or liver disease. Majority of the participants (88.5%) knew the single test used to confirm a patient has CHB is the hepatitis B surface antigen (HBsAg) test. However, knowledge about the tests to order to diagnose whether a patient has immunity to HBV, to monitor for liver damage, and to screen for liver cancer was poor (correct responses ranged from 20.1% to 55.7%). Knowledge about hepatitis B treatment was also lacking. Only 61.5% of the HCWs surveyed were aware that there is no curative treatment for CHB. Many (70.1%) wrongly believed that every CHB patients need to receive antiviral treatment.
Attitude and medical practices regarding HBV prevention
Among the 284 participants who reported they were involved in administering injection to patients, 61.3% consistently wore gloves when giving injections. 48.2% reported they consistently recapped the needle with two hands after injection, putting them at greater risk of needle stick injury. About a quarter (24.2%) reported having been pricked with a needle at work in the past 12 months. About 34.4% reported that there were hepatitis B vaccine stock-out or no vaccine available for administration to newborn at their clinic (Table 3).
Among the HCWs surveyed, 42% expressed concerns with casual contact or working in the same place and 40.8% expressed concerns in sharing food with a patient with CHB. Similarly, 42.7% of the participants were either concerned or somewhat concerned if their children is in the same class with another student with CHB.
HBV knowledge scores and associated factors
Out of a total score of 42, the average HBV knowledge score was 25.0 ± 4.5 (mean ± SD), median score was 25 (range 9–34, interquartile range (IQR) 23–28). Knowledge scores for the eight knowledge categories are presented in Table 4. Among the eight knowledge categories, median scores were lowest for CHB monitoring and treatment.
In multivariate linear regression analysis, physicians scored significantly higher than physician assistants, nurses, midwives, medical students, and lab technicians. Not having received training on HBV prevention and management in the past two years was associated with a 1.1 point lower total HBV knowledge score (p<0.05). Age, gender, years of work experience, work department and type of health facility had no significant impact on the total HBV knowledge scores. Prior encounter with HBV infected patients, history of having been tested or vaccinated against HBV were not associated with a significant improvement in their total HBV knowledge score (Table 5).
Discussion
HBV is a serious public health problem in Vietnam. Our survey shows that even among healthcare professionals, basic knowledge about HBV facts including transmission routes and prevention measures is lacking. Majority of HCWs surveyed were not aware of the high prevalence of chronic HBV in Vietnam, and the major cause of CHB in Vietnam is mother-to- child transmission. About 42.7% of the participants mistakenly believed that most of the people who have CHB were infected from sexual transmission. Only one-fourth (24.5%) of the participants were aware the risk of developing chronic infection is highest when infected at birth. About 30.2% of the participants wrongly believed that HBV can be transmitted through eating or sharing food with CHB patients. These results are in line with the findings from previous surveys at selected health clinics in Vietnam that reported gaps in knowledge among HCWs and medical students regarding hepatitis B transmission, the health risks associated with chronic HBV infection and diagnostic tests for hepatitis B [17, 18]. The lack of knowledge and misconceptions among HCWs about the ways hepatitis B is transmitted and the high risk of developing CHB when infected at birth can result in missed opportunities for HBV prevention and vaccination, and discrimination against those who have CHB.
Since perinatal transmission is the major cause of CHB in Vietnam, infant vaccination plays a critical role in preventing new CHB infection. With the majority of births (98%) being attended by trained HCWs in Vietnam [19], HCWs are the most trusted advisor and influencer of the hepatitis B vaccine birth dose decision. Our study shows that uncertainty about the safety of the hepatitis B vaccine among HCWs was apparent. Only 61.2% of participants were confident that the hepatitis B vaccine is very safe. Surprisingly, our recent study in the same region showed that pregnant women and mothers seemed less skeptical about the safety of the hepatitis B vaccine than the HCWs surveyed. According to that study, 72.9% of women felt it is safe to give their baby the hepatitis B vaccine within the first 24 hours after birth if the newborn is healthy and stable [20]. Research has shown that health care providers’ acceptance of vaccine is a complex behavior that can be influenced by various factors including their knowledge, attitudes and beliefs as well as broader organizational, political, cultural factors [21, 22]. Vaccine hesitancy among HCWs could perpetuate suboptimal performance of infant HBV vaccination program. Further research to better understand the underlying determinants of vaccine hesitancy among HCWs in Vietnam is needed to inform the design of effective responses.
Hepatitis B is also an important occupational hazard for HCWs [1]. HCWs have up to a four-fold increased risk of acquiring HBV infection [23, 24]. According to the World Health Organization (WHO), 5.9% of HCWs each year are exposed to blood-borne HBV infection corresponding to about 66,000 HBV infections among HCWs worldwide [25]. The risk of HBV transmission in health-care settings is highest in countries where the overall prevalence of hepatitis B surface antigen is > 8% [26]. Some studies have reported knowledge about HBV among HCWs is deficient; consequently, proper precautions against blood-borne infections is lacking [8]. According to WHO estimates, hepatitis B vaccination coverage among HCWs remains poor varying from 18% (Africa) to 77% (Australia and New Zealand) [25]. Among the HCWs surveyed, 68.8% reported they have received the hepatitis B vaccine. This is consistent with the result from a recent survey among medical students in Vietnam in which 68.7% reported having received the hepatitis B vaccine [27]. This study, however, did not ask whether the participants completed the three vaccine doses. Adherence to standard universal infection control precautions in patient care is recommended to protect HCWs from contracting HBV and other blood-borne infections and to prevent the spread of infection from patient to patient. Previous studies have reported low compliance with injection safety standards among HCWs in Vietnam, ranging from 6.0 to 22.6% [28, 29]. The main risk factor for contracting blood-borne diseases among HCWs is direct contact with infectious materials, especially infected blood or from needle stick injury by contaminated body fluids [30]. In this study, only 61.3% reported they always wear gloves when giving injections. Among the HCWs surveyed, 26.1% reported having been pricked with a needle at work in the past 12 months, which was lower than the 65% reported in an earlier study in selected hospitals in Vietnam in 2012 [31]. The safest way to dispose a used needle is immediately placing the needle in a sharps disposal container to reduce the risk of needle sticks, cuts and punctures. In this survey, we found only 46.8% of HCWs reported adherence to this standard practice. Half (48.2%) of the participants in this study reported they routinely recapped the used needles with two hands after injection, putting them at greater risk of needle stick injury, compared with 35.0% in a report from India [32] and 81% from Sudan [33]. The findings re-emphasize the need for improving injection safety knowledge and training to prevent needle stick injuries and the transmission of HBV and other blood-borne infections in the health care settings.
This study reveals serious lack of knowledge about testing and interpretation of hepatitis B test results, CHB symptoms, and monitoring and treatment of patients with CHB. The median knowledge scores regarding CHB monitoring and treatment were the lowest among the eight HBV knowledge categories. The percentages of participants who provided correct answers to all the questions on the recommended tests to monitor for liver damage and to screen for liver cancer were only 1.6% and 2.5% respectively. Only 13.7% of the HCWs surveyed were aware that most of the CHB patient are asymptomatic. Providing basic information on CHB symptoms, monitoring and management should be addressed in future HCWs’ training.
When analyzed by the type of HCWs surveyed, physician assistants, nurses and midwives scored significantly lower than physicians. This is in line with the findings from other studies in which the type of healthcare professional have a significant association with HBV knowledge scores [13, 34–36]. Surprisingly, in this study, HCWs who had previous exposure to CHB patients or vaccinated against hepatitis B did not score better than those who did not. This is in contrast to a recent study in China that reported HCWs who had been screened for HBV and vaccinated scored significantly higher [13]. In this study, participants who attended training on HBV prevention, diagnosis or management in the last two years scored significantly higher than those who did not. This underlines a need for improved and targeted viral hepatitis training programs for HCWs, particularly for physician assistants, nurses and midwives, to improve knowledge and practice related to HBV prevention, monitoring and management, and injection safety.
Stigma surrounding caring for patients with blood-borne diseases including CHB in the health care settings can cause psychological and social consequences on patients and pose significant challenges to prevention, testing, and treatment efforts. In a recent study in Vietnam, almost one third of the participating nurses indicated their unwillingness to provide care for patients infected with HBV or hepatitis C [37]. The same study pointed out that the level of willingness is associated with individual confidence in protecting themselves against infection and negative attitudes towards HBV and hepatitis C infected patients. In this study, about 40% of participants were concerned or somewhat concerned about casual contact or eating with a person with CHB, or if their children are in the same class with a classmate who has CHB. HCWs’ misconceptions about HBV transmission and attitudes towards persons with CHB may lead to similar beliefs by the patients they serve. A recent study of pregnant women and mothers in the same region also found 37.4% had concerns about working with or sharing food with CHB patients and 40.8% expressed concerns in having their children attend the same class as a child with CHB [20]. Improving training and knowledge of HCWs about hepatitis B transmission would be important to eliminate HCWs’ and their patients’ misconceptions that result in disease stigma and discrimination.
Study limitations
This study also has certain caveats that need to be taken into account. First, the answers are self-reported hence could not be validated. In addition, this study was conducted in two Northern provinces of Vietnam with low hepatitis B birth dose vaccination coverage and the results may not be representative to other parts of the country.
Conclusion
This study found significant gaps in the knowledge of HCWs across all aspects of HBV including the high risk of CHB associated with infection at birth, vaccine safety, CHB symptoms, monitoring and treatment. Adherence among HCWs to standard injection safety practices, particularly on how to handle needles and syringes after injection, is also deficient. This study also re-affirms significant stigma among HCWs toward chronic HBV patients. The findings from this survey indicates an immediate need for implementing an effective training program including the use of the recently developed Vietnamese online viral hepatitis training course [38] to build capacity among healthcare workers within the Vietnam health system to improve hepatitis B prevention and management practices and to eliminate hepatitis B stigma.
Reference
- 1.
World Health Organization: Hepatitis B Factsheet (2018). https://www.who.int/news-room/fact-sheets/detail/hepatitis-b.
- 2.
World Health Organization: Global hepatitis report 2017 (2017) https://www.who.int/hepatitis/publications/global-hepatitis-report2017/en/.
- 3. Global Burden of Disease Liver Cancer, C., The burden of primary liver cancer and underlying etiologies from 1990 to 2015 at the global, regional, and national level: Results from the global burden of disease study 2015. JAMA Oncology, 2017. 3(12): p. 1683–1691. pmid:28983565
- 4. Kakumu S., Sato K., Morishita T., Trinh K. A., Nguyen H. B., Banh V. D., et al., Prevalence of hepatitis B, hepatitis C, and GB virus C/hepatitis G virus infections in liver disease patients and inhabitants in Ho Chi Minh, Vietnam. J Med Virol, 1998. 54(4): p. 243–8. pmid:9557289
- 5. Hipgrave D. B., Nguyen T. V., Vu M. H., Hoang T. L., Do T. D., Tran N. T., et al., Hepatitis B infection in rural Vietnam and the implications for a national program of infant immunization. Am J Trop Med Hyg, 2003. 69(3): p. 288–94. pmid:14628946
- 6. Nguyen V. T., McLaws M. L., and Dore G. J., Highly endemic hepatitis B infection in rural Vietnam. J Gastroenterol Hepatol, 2007. 22(12): p. 2093–100. pmid:17645465
- 7. Duong T. H., Nguyen P. H., Henley K., and Peters M., Risk factors for hepatitis B infection in rural Vietnam. Asian Pac J Cancer Prev, 2009. 10(1): p. 97–102. pmid:19469633
- 8. Schweitzer A., Horn J., Mikolajczyk R. T., Krause G., and Ott J. J., Estimations of worldwide prevalence of chronic hepatitis B virus infection: a systematic review of data published between 1965 and 2013. Lancet, 2015. 386(10003): p. 1546–55. pmid:26231459
- 9. Nguyen V. T., Law M. G., and Dore G. J., An enormous hepatitis B virus-related liver disease burden projected in Vietnam by 2025. Liver Int, 2008. 28(4): p. 525–31. pmid:18266635
- 10.
World Health Organization. International Agency for Research on Cancer. Global Cancer Observatory (2018). http://gco.iarc.fr/today/home.
- 11.
Ferlay J, S. I., Ervik M, Dikshit R, Eser S, Mathers C, Rebelo M, Parkin DM, Forman D, Bray, F., GLOBOCAN 2012 v1.1, Cancer Incidence and Mortality Worldwide: IARC CancerBase: 2012. No. 11
- 12.
Vietnam Ministry of Health, The National Action Plan for Viral Hepatitis Prevention and Control 2015–2019, 2015, https://thuvienphapluat.vn/van-ban/The-thao-Y-te/Quyet-dinh-739-QD-BYT-2015-phong-chong-benh-viem-gan-vi-rut-2015-2019-269703.aspx.
- 13. Chao J., Chang E. T., and So S. K., Hepatitis B and liver cancer knowledge and practices among healthcare and public health professionals in China: a cross-sectional study. BMC Public Health, 2010. 10.
- 14. Chao S. D., Cheung C. M., Yang E. J., So S. K., and Chang E. T., Low levels of knowledge and preventive practices regarding vertical hepatitis B transmission among perinatal nurses. J Obstet Gynecol Neonatal Nurs, 2012. 41(4): p. 494–505. pmid:22697047
- 15. Wang J., Feng Q., Tam A., Sun T., Zhou P., and So S., Evaluation of the first open-access hepatitis B and safe injection online training course for health professionals in China. BMC Medical Education, 2016. 16(1): p. 81.
- 16. Bursac Z., Gauss C. H., Williams D. K., and Hosmer D. W., Purposeful selection of variables in logistic regression. Source code for biology and medicine, 2008. 3: p. 17–17. pmid:19087314
- 17. Cuong N, T. D., Ngan N, Hai Phan, Knowledge, attitude and practice of Hepatitis B virus infection among health care workers in hospitals of Quang Binh province in 2012. Vietnam Journal of Preventive Medicine, 2012. Volume XXVI, 7 (180) 2016 https://skhcn.quangbinh.gov.vn/3cms/upload/khcn/File/TapChiKHCN/2017/so4/18.pdf
- 18. Linh N, G. H., Son Ng, Minh Ng, Han P, Knowledge, attitude, practice towards hepatitis B transmission prevention of students of Hai Phong University of Medicine and Pharmacy 2015. Vietnam Journal of Preventive Medicine, 2015. Volume XXVI, No. 14 (187) 2016.
- 19.
World Health Organization, Success Factors for Women’s and Children’s Health: Vietnam, 2015, https://www.who.int/pmnch/knowledge/publications/successfactors/en/.
- 20. Hang Pham T. T., Le T. X., Nguyen D. T., Luu C. M., Truong B. D., Tran P. D., et al., Knowledge, attitudes and practices of hepatitis B prevention and immunization of pregnant women and mothers in northern Vietnam. PLOS ONE, 2019. 14(4): p. e0208154. pmid:30969972
- 21. MacDonald N. E., Vaccine hesitancy: Definition, scope and determinants. Vaccine, 2015. 33(34): p. 4161–4. pmid:25896383
- 22. Verger P., Fressard L., Collange F., Gautier A., Jestin C., Launay O., et al., Vaccine Hesitancy Among General Practitioners and Its Determinants During Controversies: A National Cross-sectional Survey in France. EBioMedicine, 2015. 2(8): p. 891–7. pmid:26425696
- 23. Ziraba A. K., Bwogi J., Namale A., Wainaina C. W., and Mayanja-Kizza H., Sero-prevalence and risk factors for hepatitis B virus infection among health care workers in a tertiary hospital in Uganda. BMC infectious diseases, 2010. 10: p. 191–191. pmid:20587047
- 24. Jha A. K., Chadha S., Bhalla P., and Saini S., Hepatitis B infection in microbiology laboratory workers: prevalence, vaccination, and immunity status. Hepatitis research and treatment, 2012. 2012: p. 520362–520362. pmid:23304474
- 25. Prüss-Üstün A., Rapiti E., and Hutin Y., Estimation of the global burden of disease attributable to contaminated sharps injuries among health-care workers. American Journal of Industrial Medicine, 2005. 48(6): p. 482–490. pmid:16299710
- 26. Trépo C., Chan H. L. Y., and Lok A., Hepatitis B virus infection. The Lancet, 2014. 384(9959): p. 2053–2063.
- 27. Quang Vo T., Le Hoang Nguyen T., and Ngoc Pham M., Exploring knowledge and attitudes toward the hepatitis B virus: An internet-based study among Vietnamese healthcare students. Vol. 6. 2018. 458–470.
- 28.
PD, M., Assess knowledge of injection safety and frequency of risk due to sharp objects for nursing-midwives in 8 provinces represent the first six months of 2005. Proceedings of the scientific research nationwide nursing; 2nd the Vietnam Nurses Association, 2005. 2005;(224–232.).
- 29.
Van Tuong P, P. T., Anh BTM and Nguyen THT., Assessment of injection safety in Ha Dong General Hospital, Hanoi, in 2012. F1000Research 2017.
- 30. Pellissier G., Yazdanpanah Y., Adehossi E., Tosini W., Madougou B., Ibrahima K., et al., Is universal HBV vaccination of healthcare workers a relevant strategy in developing endemic countries? The case of a university hospital in Niger. PloS one, 2012. 7(9): p. e44442–e44442. pmid:22970218
- 31.
Duong, V. K., WHO Health care worker safety; Vietnam National Institute of Epidemiology, Research on needlestick injuries amongst health care workers and interventions in selected hospitals in Hanoi 2012. 2012.
- 32. Yasobant S., Saxena D., Puwar T., Trivedi P., Patel S., J Fancy M., et al., Knowledge of Hepatitis B among Doctors working in Public Health System of Gujarat, India: An Interventional Study. Vol. 4. 2017. 1136.
- 33. Bakry S. H., Mustafa A. F., Eldalo A. S., and Yousif M. A., Knowledge, attitude and practice of health care workers toward Hepatitis B virus infection, Sudan. Int J Risk Saf Med, 2012. 24(2): p. 95–102. pmid:22751191
- 34. Abeje G. and Azage M., Hepatitis B vaccine knowledge and vaccination status among health care workers of Bahir Dar City Administration, Northwest Ethiopia: a cross sectional study. BMC Infectious Diseases, 2015. 15(1): p. 30.
- 35. Fufore M., Cook P., and Kirfi A., Health workers’ knowledge, attitude and practice towards Hepatitis B infection in Northern Nigeria. International Journal of Caring Sciences, 2016. 9(3): p. 955–965.
- 36. Chen Y. and Xie C., Knowledge regarding hepatitis B mother-to-child transmission among healthcare workers in South China. 2018. 25(5): p. 561–570.
- 37. Ishimaru T., Wada K., Hoang H. T. X., Bui A. T. M., Nguyen H. D., Le H., et al., Nurses’ willingness to care for patients infected with HIV or Hepatitis B / C in Vietnam. Environmental Health and Preventive Medicine, 2017. 22(1): p. 9. pmid:29165125
- 38.
Asian Liver Center at Stanford University, Department of Preventive Medicine, Vietnam Ministry of Health. 2018. KnowHBVHCV. https://lagunita.stanford.edu/courses/course-v1:Medicine+KNOWHBVHCV+SelfPaced/about.