Seroprevalence of hepatitis B infection in the Turkish population in Northern Cyprus
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1 The Turkish Journal of Pediatrics 2009; 51: Original Serorevalence of heatitis B infection in the Turkish oulation in Northern Cyrus Zafer Kurugöl 1, Güldane Koturoğlu 1, Sadık Akşit 1, Tijen Özacar 2 Northern Cyrus Study Team a Deartments of 1 Pediatrics and 2 Microbiology, Ege University Faculty of Medicine, İzmir, Turkey a Sıdıka Kayımbaşoğlu, Sonay Özbalıkçı, Gülten Erçal, Emine Güllüelli, Figen Bakkaloğlu, Ertan Doğan, Hasan Garabli, Hüseyin Erçal and Cemal Mert SUMMARY: Kurugöl Z, Koturoğlu G, Akşit S, Özacar T, Northern Cyrus Study Team. Serorevalence of heatitis B infection in the Turkish oulation in Northern Cyrus. Turk J Pediatr 2009; 51: This study was conducted to determine the serorevalence of heatitis B virus (HBV) infection in the Turkish oulation in Northern Cyrus. The secondary aim of this study was to assess the imact of the universal infant heatitis B vaccination rogram, which started in A total of 600 erso 1 to 30 years old were selected for the study with cluster samling. The information on sociodemograhic characteristics was gathered for each articiant and in 585 of them, heatitis B surface antigen (HBsAg), anti-heatitis B surface antigen antibody (anti-hbs) and anticore antibody (anti-hbc) were tested. The overall revalence of anti-hbc and HBsAg carriage was 13.2% and 0.85%, resectively. Old age and low arental educational level were the major indeendent risk factors for HBV tramission. Serorevalence of both anti-hbc and anti-hbs antibodies was similar in children 1-7 years of age. After 8 years of age, anti-hbc serorevalence increased significantly with age, while anti-hbs revalence decreased (<0.001). Anti-HBc revalence increased from 7.0% in children aged 1-7 years to 17.9% in erso aged years. None of the children under 12 years of age were HBsAg-ositive, while 1.9% of erso aged years were HBsAg carriers. Anti-HBs serorevalence exceeding 90% was found in the cohorts targeted by the routine heatitis B vaccination rogram, whereas 36.4% of young adults aged years were anti-hbs-ositive. The study shows that universal infant heatitis B immunization has a substantial imact on the immunity in children. However, revalence of HBV infection is still high in adolescent and young adults in Northern Cyrus. Therefore, catch-u immunization for these grous will hel to reduce heatitis B tramission. Key words: heatitis B immunization, eidemiology, vaccine. Heatitis B virus (HBV) infection continues to be an imortant ublic health roblem warranting high riority efforts for revention and control. According to the most recent World Health Organization (WHO) estimate, aroximately 30% of the world s oulation, i.e. about 2 billion eole, have serological evidence of ast or resent HBV infection, and 360 million are chronically infected and at risk for HBVrelated liver disease. 1 Aroximately one-third of all cases of cirrhosis and half of all cases of heatocellular carcinoma can be attributed to chronic HBV infection. HBV is estimated to be resoible for 600,000 deaths each year 1,2. The frequency and atter of HBV tramission vary markedly in different arts of the world. Aroximately 45% of the world s oulation live in areas where the revalence of chronic HBV infection is high (i.e., >8% of the oulation is HBsAg-ositive); 43% live in areas of intermediate endemicity (i.e., 2% to 7% of the oulation is HBsAg-ositive); and 12% live in areas of low endemicity (i.e., <2% of the oulation is HBsAg-ositive) 3. Turkey and Greece, which are two countries with a close relatiohi with Cyrus, have an intermediate level of HBV endemicity 4,5. Cyrus is also coidered to be an intermediate
2 Volume 51 Number 2 HBV Among Turkish Poulation in Northern Cyrus 121 endemicity area 6. However, the eidemiology of HBV infection in the Turkish oulation in Northern Cyrus is not known because a community-based study on this disease has not been conducted in the oulation. We therefore conducted this study to determine the revalence of HBV infection in the 1- to 30-year-old Turkish oulation in Northern Cyrus. In 1992, WHO recommended the integration of heatitis B vaccine into the national immunization rograms of all countries by As of 2004, more than 150 (78%) of 192 WHO member states had adoted universal childhood heatitis B vaccination olicies 8. In the majority of the countries, vaccination coverage exceeded 80% within a few years of imlementation 9 and the revalence of HBV infection has been decreased dramatically For examle, in Italy, the overall revalence of chronic HBV infection declined by 27.5% 15. Northern Cyrus introduced a universal infant heatitis B vaccination rogram in The vaccination schedule adoted at the time was for babies to get the first dose at 2-3 months, the second dose at 3-4 months and the third dose at 6-9 months. The secondary aim of this study was to assess the imact of the mass vaccination rogram in reducing the revalence of HBV infection. Material and Methods A rosective seroeidemiologic study of HBV infection was carried out in all rovinces of Northern Cyrus in March The rovinces were Lefkoşa, Gazimağusa, Girne, Güzelyurt and İskele. The study was aroved by the Ethical Committee of Ege University Medical Faculty. The study oulation included healthy subjects aged 1-30 years who were born in Cyrus. Subjects living in Northern Cyrus, but who had moved from Turkey were excluded from the study. The oulation of Turkish Cyriots was estimated as aroximately 148,000 in 2003 by the United Natio and about 72,000 (48%) of this oulation were between 1 and 30 years of age. The samling method of 30 clusters recommended by the Exanded Programme on Immunization (EPI)/WHO for field studies 16,17 was used for selecting subjects of a re-determined number in the rural and urban areas. The selection rocedure was carried out by creating a cumulative list of community oulatio and selecting a systematic samle from a random start. A total of 600 subjects 1 to 30 years old were selected for the study. In accordance with the oulation of rovinces, 180 subjects from Lefkoşa, 150 subjects each from Gazimağusa and Girne and 60 subjects each from Güzelyurt and İskele were included in the study. A starting household was selected in each community by locating the ward s center, randomly selecting a house from a list of all houses falling along the line drawn from the ward center to the erihery in the chosen direction. The house was then examined to determine whether subjects of eligible age and sex lived there. Subsequently, the nearest household to the right was visited and the stes reeated until the desired number of erso was obtained. Only one individual from each family was selected in the study. For each articiant, a questionnaire was comleted to rovide information on sociodemograhic characteristics and heatitis B vaccination status. The information was obtained from the arents of the children and from the adults themselves. Immunization status of the study subjects was verified with their vaccination records, if available. After written informed coent was obtained, blood samles were taken from each articiant for serorevalence analyses. Sera were stored at - 20ºC until tested at the Microbiology Laboratory of Ege University Faculty of Medicine. In order to differentiate the various ossible stages of ast or resent HBV infection, a test combination of the measurement of anti-hbc, anti-hbs and HBsAg was used in this study. Heatitis B surface antigen (HBsAg), antibodies to heatitis B surface antigen (anti-hbs) and antibody to heatitis B core antigen (anti-hbc) were studied using a commercial ELISA method (RADIM S..a.; Rome, Italy). Particiants who were both anti-hbc- and anti- HBs-ositive were classified as having been heatitis B-exosed and ossessing immunity (natural heatitis B infection). Particiants who were anti-hbc- and HBsAg-ositive were classified as heatitis B carriers. Perso who tested anti-hbc-negative but anti-hbs-ositive were classified as most robably vaccinated. Statistical analyses were erformed using SPSS for Windows version The association between the sociodemograhic variables and revalence of heatitis B markers was
3 122 Kurugöl Z, et al The Turkish Journal of Pediatrics March - Aril 2009 evaluated. Testing for statistical significance for univariate analysis was erformed by the χ 2 test. A value of <0.05 was coidered as significant. Multivariate analysis was erformed using a logistic regression model containing the following indeendent variables: age, gender, region of residence, family income, education level and number of household members. The anti-hbc serorevalence was fitted as the deendent variable in multile regression to assess the influence of indeendent variables on anti-hbc seroositivity. The number of erso in the household was categorized as less than five erso versus five and more erso er household. Parental educational level was defined on the basis of the highest educational level achieved and was classified as grou 1 (<8 years) or grou 2 ( 9 years). The highest level achieved by one of the arents was used for children younger than 16 years. Results A total of 585 blood samles were analyzed (15 samles were excluded due to inadequate samle size or hemolysis). In 13.2% of the serum samles, there was evidence of a revious HBV infection, and 0.85% were HBV carriers (Table I). Anti-HBs was ositive in 64.4% (n=377) of the serum samles. Of the 377 anti-hbs-ositive articiants, 322 (55.0%) were anti-hbc-negative, indicating that their antibody status was robably due to heatitis B vaccination. Table I. Heatitis B Markers in the Study Poulation (n=585) Marker Number Percentage 95% CI HBsAg Anti-HBs+/anti-HBc Anti-HBc Anti-HBs CI: Confidence interval. Serorevalence of heatitis B markers by age grou is shown in Fig. 1. Serorevalence of both anti-hbc and anti-hbs antibodies were similar in children 1-7 years of age. After 8 years of age, anti-hbc serorevalence increased significantly with age, while anti-hbs revalence decreased (<0.001). Anti-HBc revalence increased from 7.0% in children aged 1-7 years to 17.9% in erso aged years (Fig. 1, Table II). None of the children under 12 years of age was HBsAg-ositive, while 1.9% of erso in the years of age grou were HBsAg-ositive. Anti-HBs serorevalence was 90.7% in children aged 1-7 years, whereas 36.4% of young adults aged years were anti-hbs-ositive. Fig. 1. Serorevalence of HBV markers in the Turkish oulation in Northern Cyrus by age grous., Anti-HBsositive and anti-hbc-ositive, natural infection;, HBsAg-ositive, carriers;, anti-hbs-ositive and anti-hbcnegative, vaccinated;, anti-hbs-negative, suscetible.
4 Volume 51 Number 2 HBV Among Turkish Poulation in Northern Cyrus 123 Age grous Gender Male Female Location Urban Rural Table II. Prevalence of HBV Markers According to Sociodemograhic Variables in the Turkish Poulation in Cyrus (n=585) Family size <5 eole in house 5 eole in house Number Anti-HBc HBsAg Anti-HBs Parental education level <8 years 9 years (7.0)* 9 (8.6) 14 (13.3) 19 (17.9) 23 (17.4) (13.1) 41 (13.2) 30 (12) 47 (14.1) 46 (11.8) 30 (17) 20 (17.1) 15 (6.5) (0) 0 (0) 1 (0.95) 2 (1.9) 2 (1.5) ** 2 (0.7) 3 (1) 2 (0.8) 3 (0.9) 4 (1) 1 (0.6) 2 (1.7) 0 (0) (90.7) 88 (80.8) 63 (60) 50 (47.2) 48 (36.4) < (69.8) 218 (70.3) 176 (70.1) 234 (70.1) 271 (69.5) 125 (71) 90 (76.9) 203 (88.3) Occuation Students (11.2) 2 (0.8) 222 (88.8) State emloyees (27.7) 0 (0) 34 (72.3) Industrial workers 41 6 (14.6) 1 (2.4) 29 (70.7) Housewives 41 4 (9.8) 0 (0) 30 (73.2) Health-care worker 20 3 (15) 0 (0) 17 (85) Unemloyed 8 4 (50) 1 (12.5) 5 (62.5) Farmers * Numbers in arentheses, ercent. ** Not significant. 5 2 (40) (20) (60) <0.001 The education level of arents was significantly correlated with HBV revalence. Anti-HBc and HBsAg ositivity rates were significantly higher in children of arents with low educational level (17.1% and 1.7%, resectively) comared to children of arents with higher educational level (6.5% and 0%, resectively) (Table II). Anti- HBc serorevalence was slightly higher in large families with five and more members (17.0%) than in small families with four or fewer members (11.8%), but the difference was not statistically significant. Gender did not affect the seroositivity rates. There was no difference in seroositivity rates between rural and urban areas. Serorevalence of anti-hbc was higher in unemloyed erso (50%) and farmers (40%) than in housewives (9.8%) and students (11.2%). Seroositivity of HBsAg was also higher in unemloyed erso (12.5%) and farmers (20%). Health care workers had an infection rate of 15% and a vaccination rate of 80%. No health care workers in the study grou had HBsAg (Table II). Multivariant analysis revealed age and low arental educational level as the only indeendent risk factors for anti-hbc antibody ositivity (Table III). Discussion There have been only two serological studies in Cyrus rior to this study. The first was erformed in the Greek oulation of Cyrus in 1988 among blood donors, soldiers and risk grous, and HBsAg ositivity rates were found
5 124 Kurugöl Z, et al The Turkish Journal of Pediatrics March - Aril 2009 Age Gender Male Female Location Urban Rural Table III. Odds Ratios (OR) for Associatio Between Different Variables and Anti-HBc Antibody Positivity n Odds ratio 95% CI * * Family size <5 eole in house 5 eole in house Parental education <8 years 9 years * Statistically significant. CI: Confidence interval * as 0.77% in blood donors and 1.01% in soldiers. The revalence of ast infection was between 11.1% and 13.6% 18. This study reorted that HBV infection should be coidered as a major ublic health roblem in Cyrus. The second study was erformed in the Turkish oulation of Cyrus in 2006, and HBsAg ositivity rates were found as 3.0% in blood donors and 2.7% in soldier candidates 19. However, these studies were concentrated in selected oulation grous, like blood donors, army recruits, or high-risk grous, which are not reresentative of the general oulation. Thus, the resent study is the first to be conducted with a systematic eidemiological aroach on the revalence of HBV infection in the Turkish oulation of Northern Cyrus. In general, Cyrus is coidered to be an intermediate endemic region 6. At resent, according to our findings, it seems that only 13.2% of the Turkish oulation under age 30 in Northern Cyrus was anti-hbc-ositive. The roortion of HBsAg-ositive erso in the oulation was 0.85%. Northern Cyrus thus comlies with the criteria for a low endemic region (<2% HBV carriers and <20% HBV markers). Heatitis B virus revalence in Northern Cyrus is markedly lower than reorted from Turkey 5, In a recent serorevalence study, anti-hbc revalence was found as 15.1% in the sera of 2,157 subjects under the age of 30 in Turkey 5. According to the study results reorted by Kanra et al. 5, HBsAg ositivity was 5.4% in Turkey, whereas the ositivity rate was found as only 0.85% in Northern Cyrus. In Northern Cyrus, the universal heatitis B infant immunization rogram was imlemented in July We could not comare our results with revaccination HBV infection rate, because revaccination data are not available in Northern Cyrus. However, our study clearly shows the imact of the mass vaccination rogram started in In the 1-7 years of age grou, anti- HBc serorevalence was 7% and none of the children was HBsAg-ositive. After 8 years of age, anti-hbc serorevalence increased significantly with age, while vaccination rate decreased (Fig. 1). Heatitis B infection rate was esecially rominent in erso in the years of age grou, with a revalence of 17.9%. Adolescents and young adults in the age grou have an almost three-fold risk of HBV infection comared to the 1-7 years of age grou (<0.001), and 1.9% of them were HBsAg carriers. This oulation most likely came into contact with the infectious agent. On the other hand, the decrease in HBV revalence in younger age grous was robably due to universal vaccination of all infants. The large majority of cohorts targeted
6 Volume 51 Number 2 HBV Among Turkish Poulation in Northern Cyrus 125 by the mass vaccination rogram ossess rotective antibody titers, while only 36% of young adults have rotective antibody agait heatitis B. It is interesting to note that only 19% of adolescent and young adults have been vaccinated. Therefore, a catch-u immunization rogram targeted at adolescents and young adults in Northern Cyrus would seem to be useful to decrease HBV infection rate in the future. The higher revalence of heatitis B markers in males as comared to females was reorted in some studies 4,22,23. However, in this study, the revalence of HBV infection was found not different between males and females. On the other hand, working in health care facilities was not found as a risk factor for tramission of heatitis B. Some studies also suort that there is no significant seroositivity difference between health care workers and the other rofessio 4,21. These results may be due to the higher vaccination rate of health care workers. In this study, 2.9% of all samles were found to be ositive for anti-hbc alone. Because of inadequate samle volumes, anti-hbc-ositive but HBsAg- and anti-hbs-negative samles were not evaluated further for anti-hbc IgM and anti-hbe ositivity. These erso may have acute HBV infection in the window hase, low level chronic HBV infection, ast infection with anti HBs loss, or false-ositive test results. The resence of anti-hbc alone varies deending on the oulation tested. In a German survey, 0.84% of the entire oulation was found to be ositive for anti-hbc only. In another German study, however, this roortion was 19.2% in a high-risk grou of convicts 24. The results of our study show that the universal infant heatitis B immunization rogram, which started in 1998 in Northern Cyrus, has had a substantial imact on immunity in children. However, revalence of HBV infection is still high in adolescent and young adults. Therefore, a catch-u immunization rogram for these grous in addition to routine infant immunization will decrease the HBV infection rate and will hel to reduce heatitis B tramission in Northern Cyrus. REFERENCES 1. World Health Organization. Heatitis B vaccines. Wkly Eidemiol Rec 2004; 79: Sheard CW, Simard EP, Finelli R, Fiore AE, Bell BP. Heatitis B virus infection: eidemiology and vaccination. Eidemiol Rev 2006; 28: Mast E, Mahoney F, Kane M, Margolis H. Heatitis B vaccine. In: Plotkin SA, Oretein WA (eds). Vaccines (4 th ed). Philadelhia: Saunders; 2004: Gogos CA, Fouka KP, Nikiforidis G, et al. Prevalence of heatitis B and C virus infection in the general oulation and selected grous in South-Western Greece. Eur J Eidemiol 2003; 18: Kanra G, Tezcan S, Badur S, Turkish National Study Team. Heatitis B and measles serorevalence among Turkish children. Turk J Pediatr 2005; 47: Andre F. Heatitis B eidemiology in Asia, the Middle East and Africa. Vaccine 2000; 18 (Sul): World Health Organization. Exanded Programme on Immunization. Global Advisory Grou - Part I. Weekly Eidemiological Record 1992; 67: World Health Organization global immunization data. Geneva, Switzerland: World Health Organization, (htt:// data/globalimmunizationdata.df). 9. World Health Organization. WHO-UNICEF estimates of HeB3 coverage. Geneva, Switzerland: World Health Organization, (htt:// immunization_monitoring/en/globalsummary/timeseries/ tswucoverageheb3.htm). 10. Gilca V, Duval B, Boulianne N, Dion R, De Serres G. Imact of the Quebec school-based heatitis B immunization rogram and otential benefit of the addition of an infant immunization rogram. Pediatr Infect Dis J 2006; 25: Tawk HM, Vickery K, Bisset L, Selby W, Cossart YE. Infection in Endoscoy Study Grou. The imact of heatitis B vaccination in a Western country: recall of vaccination and serological status in Australian adults. Vaccine 2006; 24: Sheard CW, Finelli L, Fiore AE, Bell BP. Eidemiology of heatitis B and heatitis B virus infection in United States children. Pediatr Infect Dis J 2005; 24: Viviani S, Mendy M, Jack AD, Hall AJ, Montesano R, Whittle HC. Heatitis B vaccination in infancy in the Gambia: rotection agait carriage at 9 years of age. Vaccine 1999; 17: Mossong J, Putz L, Patiny S, Shneider F. Seroeidemiology of heatitis A and heatitis B virus in Luxembourg. Eidemiol Infect 2006; 134: Namgyal P. Imact of heatitis B immunization, Euroe and worldwide. J Heatol 2003; 39 (Sul): Rothenberg RB, Lobanov A, Singh KB, Stroh G Jr. Observatio on the alication of EPI cluster survey methods for estimating disease incidence. Bull WHO 1985; 63: Henderson RH, Sundaresan T. Cluster samling to assess immunization coverage: a review of exerience with a simlified samling method. Bull WHO 1982; 60: Paaevangelou G, Roumeliotou A, Chatziminas M, et al. Eidemiological characteristics of heatitis B virus infection in Cyrus. 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7 126 Kurugöl Z, et al The Turkish Journal of Pediatrics March - Aril Sidal M, Unuvar E, Oguz F, Cihan C, Onel D, Badur S. Age-secific seroeidemiology of heatitis A, B, and E infectio among children in Istanbul, Turkey. Eur J Eidemiol 2001; 17: Erden S, Buyukozturk S, Calangu S, Yılmaz G, Palanduz S, Badur S. A study of serological markers of heatitis B and C viruses in Istanbul, Turkey. Med Princ Pract 2003; 12: Demirtürk T, Demirdal T, Torak D, Altındıs M, Aktee OC. Heatitis B and C virus in West-Central Turkey: serorevalence in healthy individuals admitted to a university hosital for routine health checks. Turk J Gastroenterol 2006; 17: Thierfelder W, Hellenbrand W, Meisel H, Schreier E, Dortschy R. Prevalence of markers for heatitis A, B and C in the German oulation. Results of the German National Health Interview and Examination Survey Eur J Eidemiol 2001; 17: Neifer S, Molz B, Sucker U, Kreuzaintner E, Weinberger, K, Jilg W. Hoher Prozentsatz isoliert anti-hbc ositiver Personen unter Strafgefangenen. Gesundheitswesen 1997; 59:
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