Nigerian Journal of Clinical Practice

ORIGINAL ARTICLE
Year
: 2019  |  Volume : 22  |  Issue : 7  |  Page : 932--935

Hepatitis B surface antigenemia in two rural communities in Enugu, Nigeria


IA Meka1, OD Onodugo2, O Obienu2, J Okite1,  
1 Department of Chemical Pathology, University of Nigeria Teaching Hospital, Enugu, Nigeria
2 Department of Internal Medicine, University of Nigeria Teaching Hospital, Enugu, Nigeria

Correspondence Address:
Dr. I A Meka
Department of Chemical Pathology, College of Medicine/University of Nigeria Teaching Hospital, Ituku/Ozalla, Enugu
Nigeria

Abstract

Background: Hepatitis B virus infection is endemic in Nigeria, yet few data exist about the extent of infection in rural communities. Objective: To determine seroprevalence of hepatitis B surface antigenemia in two rural communities in Nigeria. Methods: A 330-person survey for seroprevalence of hepatitis B surface antigen (HBsAg) was carried out in two rural communities in Enugu State, Nigeria, in January, 2017. All study participants were screened for HBsAg using chromatographic immunoassay. Results: The mean age of participants was 57.2 ± 17.4 years, (range = 10–92 years) with 168 (50.9%) aged 60 years and above. The prevalence of HBsAg was found to be 2.1% with the 18–29 years age group having the highest prevalence. Conclusion: There is need to increase hepatitis B surveillance in rural communities to reduce transmission and institute early treatment.



How to cite this article:
Meka I A, Onodugo O D, Obienu O, Okite J. Hepatitis B surface antigenemia in two rural communities in Enugu, Nigeria.Niger J Clin Pract 2019;22:932-935


How to cite this URL:
Meka I A, Onodugo O D, Obienu O, Okite J. Hepatitis B surface antigenemia in two rural communities in Enugu, Nigeria. Niger J Clin Pract [serial online] 2019 [cited 2019 Aug 24 ];22:932-935
Available from: http://www.njcponline.com/text.asp?2019/22/7/932/262512


Full Text



 Introduction



Hepatitis B infection caused by hepatitis B virus (HBV) is a major disease burden in Nigeria, Africa, and indeed globally. The infection is endemic in Nigeria with a carrier rate of 9.76% (9.59–9.93).[1] It is reported that the highest rates of hepatitis B infection are found in South-East Asia, Sub-Saharan Africa, and parts of the Pacific Basin and Amazon Basin.[2] The virus is hepatotropic and known to cause both acute and chronic infections. The African region has some of the highest prevalence levels for chronic viral hepatitis in the world, with hepatitis B accounting for more than 8%.[3] It contributes significantly to mortality and morbidity as chronic infection may progress to liver cirrhosis and hepatocellular cancer. It is documented that hepatitis B and C infections cause 57% of liver cirrhosis and 78% of primary liver cancer globally.[4]

The incubation period of HBV is 75 days on average but can vary from 30 to 180 days.[5] It may be transmitted from mother to child at birth, through sexual transmission, percutaneous or mucosal exposure to infected blood and other body fluids.[5] Acute infection is marked by the presence of HBsAg and immunoglobulin M antibody to the core antigen (IgM anti-HBc), while chronic infection is characterized by the persistence of HBsAg for at least 6 months.

It is known that rural dwellers hardly have access to optimal healthcare as health facilities in these areas often provide limited services. Ignorance, cost of healthcare services, geographical distance, and cost of transportation are other factors which may hinder rural dwellers from accessing health care in more equipped healthcare facilities especially in developing countries.

Due to the ability of this virus to cause asymptomatic infection, the infectivity of this infection, its high prevalence, and contribution to mortality and morbidity, it is essential for all individuals to know their HBV status. Moreover, much of the available data on prevalence of hepatitis B infection is concentrated around pregnant women, blood donors, and health workers.

Hence, we undertook this study to determine the seroprevalence of hepatitis B surface antigenemia in two rural communities who hardly have access to such screening programs.

 Methods



Study area and population

This descriptive cross-sectional study was carried out in January 2017 in Ituku and Ozalla communities in Awgu Local Government Area of Enugu State. Enugu state is a rain forest region situated in the South-East of Nigeria, with a land mass of 7534 km 2 and a population of 3,267,837 as at 2006[6] national population census. The residents of the two communities are mostly of Igbo tribe with farming as their major occupation.

Study design and sample collection

A health outreach program was conducted in the two communities. Advocacy visits were made to the traditional rulers of the two communities and their approval was obtained a week prior to the outreach program. The management of the health center located in the communities where the exercise took place was also contacted and their approval was obtained. The choice of the health centers was essentially due to proximity to the community inhabitants, space, and convenience. Awareness was created through information dissemination in churches and market places.

Apparently healthy consenting individuals who presented for the outreach exercise were recruited after the purpose of the study was explained to them and confidentiality of data assured. Screening was done by trained personnel drawn from the University of Nigeria Teaching Hospital (UNTH), Enugu. Sample collection was carried out by aseptically collecting 4 mL of venous blood by venipuncture into EDTA bottles. This was to allow for repeat testing in case of invalid results. Clear plasma separated from the red cells on standing was then extracted using Pasteur pipette and presence of hepatitis B surface antigen (HBsAg) determined using HBsAg chromatographic immunoassay rapid test strips (Biotest, China). This test was carried out according to the manufacturer's instructions. This test strip has analytical sensitivity of 1 ng/mL of HBsAg, relative sensitivity of 99.2% (95% confidence interval 98.3%–99.7%), and relative specificity of 99.4% (95% confidence interval 98.9%–99.7%). Participants with reactive samples were referred to the gastroenterology unit of UNTH for follow-up while those with nonreactive samples were counseled.

Ethical review

The study proposal was reviewed and approved by the Health Research Ethics Committee of the UNTH. Informed consent was also obtained from prospective participants after explaining the purpose of the study in English or native language. For minors Statistical analysis

Collected data were entered into a Microsoft Excel spreadsheet and analyzed using EpiInfo 3.5.1 (CDC, Atlanta, GA, USA). Continuous variables were summarized as means (±standard deviation) and categorical variables as counts and percentages. Chi-square test was used to compare categorical data. Exact P values are reported as test of statistical significance.

 Results



A total of 330 individuals participated in the study with a mean age of 57.2 ± 17.4 years (range = 10–92 years). Majority of the participants 168 (50.9%) were aged 60 years and above. There was a preponderance of female participants with M: F ratio of 1:4.5. Sex and age distribution is as shown in [Table 1].{Table 1}

The prevalence of HBsAg was found to be 7 (2.1%). Prevalence was higher in females [6 (2.2%)] than in males [1 (1.7%)] though this difference was not statistically significant, χ2 = 0.07 (1, N = 330), P = 0.79. The 18–29 years age group had the highest prevalence of 3 (12.0%) as shown in [Table 2].{Table 2}

 Discussion



Rural settings in Nigeria are not spared of hepatitis B infections with Nigeria being an endemic country. We recorded a HBsAg prevalence of 2.1% in this study which is comparable to 2.33%[7] and 2.45%[8] recorded in India and Pakistan, respectively. It, however, differs from the prevalence of 8.8%, 7.6%, and 10.6% recorded in rural Vietnam,[9] northern Gabon in Central Africa,[10] and Central African Republic,[11] respectively.

The age distribution showed that the age group 18–29 years had the highest prevalence in this study. This correlates with the study in Lome [12] which recorded the highest prevalence in the age ranges of 20–29 years and lowest prevalence in people more than 50 years of age. It also correlates with a study in Pakistan [13] which noted that the HBV infection rate increased from 13.4% among individuals age 11–20 years to 34.9% among those age 21–30 years. The high prevalence seen in this age group may not be unrelated to the active sexual life and unprotected sexual intercourse frequently engaged in by many individuals in this age group due to peer pressure and youthful exuberance. HIV infection may also be a contributing factor as 3.2 million Nigerians are documented to be living with HIV.[14] Among these, it was reported in 2016 that young people recorded the most prevalence of HIV/AIDs in the country.[15] Coinfection of hepatitis B with HIV has been reported by various researchers.[16],[17]

As seen in our study, 50.9% of the participants were aged 60 years and above. This is in sharp contrast to the 2006 National Census data [18] which recorded that the population of those age 65+ years in Enugu State constituted only 4.5% of the state population. This concentration of elderly people could be attributed to rural–urban migration of younger people and also urban–rural migration of old retirees as common among the indigenes. Hence, rural settings in Nigeria are usually typified by a demographically unbalanced population of women, younger children, and older people.[19],[20]

This remarkably elderly population could contribute to the low prevalence seen in our study as the age group with the highest prevalence forms less than 10% of study participants. Again, in elderly people, death due to hepatitis B cannot be overlooked as it may contribute to the low prevalence. Spontaneous clearance of HBsAg which represents a favorable clinical condition with good prognosis is another important factor as it has been documented that spontaneous clearance of HBsAg is associated with age older than 40 years.[21]

 Conclusion



A majority of existing data on hepatitis B infection are hospital-based and concentrated around blood donors, health workers, and pregnant women. Our study throws light on the existence of hepatitis B infection in the rural areas which hardly have access to such surveillance programs. Hence, there is need for government, policy makers, health agencies, and all stakeholders to increase hepatitis B surveillance in rural communities. This is essential to reduce transmission rates, institute early treatment, and prevent disease progression.

Acknowledgement

The authors thank the Ituku and Ozalla communities, staff of Ituku and Ozalla health centers, and staff of Chemical Pathology of UNTH Enugu for their support and cooperation.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

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