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Prevalence of HIV infection and uptake of HIV/AIDS services among fisherfolk in landing Islands of Lake Victoria, north western Tanzania
BMC Health Services Research volume 18, Article number: 980 (2018)
New HIV infections in Tanzania have been decreasing, however some populations remain at higher risk. Despite of that, evidence on the magnitude of HIV infection and the associated factors and HIV/AIDS services uptake among fisherfolk in Tanzania are inadequately explored. This study therefore aimed at determining prevalence of HIV infection and utilization of HIV/AIDS services among fishfolk in selected Islands of Lake Victoria for evidence-based interventions.
Cross-sectional study determining status of HIV infection among fisherfolk (n = 456) and retrospective review of voluntary counselling and testing (VCT) registry (n = 1744) were done in Buchosa and Muleba districts. Structured questionnaire and HIV rapid test kits with the standard testing protocol were used as research tools.
A total of 269 (58.9%) male and 187 (41.1%) female fisherfolk were recruited during the community survey. Prevalence of HIV infection was 14% in all surveyed landing sites with a site variation from as low as 7.2% to as high as 23.8%. Participants employed in fishing related employment had higher odds of being HIV infected (5.4 times) than those who practiced fishing and partly farming [OR = 5.40; 95%CI 1.88–15.61; p < 0.001]. Participants employed in fishing related employment had higher odds of being HIV infected (5.4 times) than those practiced fishing and farming [OR = 5.40; 95%CI 1.88–15.61; P < 0.001]. Lack of formal education [aOR = 3.37; 95%CI 1.64–6.92; p < 0.001], being older [aOR = 1.06; 95%CI 1.03–1.09] and using alcohol [aOR = 2.26; 95%CI 1.23–4.15] predicted the likelihood of contracting HIV infection. Approximately three quarters (76%) of respondents had ever tested for HIV infection within past 1 year. Moreover, about half of the study participants had used condom inconsistently and 5 out of 14 (37.5%) of participants who knew their status had never started treatment. Despite the low uptake of most HIV preventive services, majority (88%) of male fisherfolk were circumcised.
The magnitude of HIV infection among fisherfolk was up to 3 times higher than that of the general populations in Muleba and Buchosa districts. Higher age, using alcohol and lack of formal education predicted increased likelihood of HIV infection. The uptake of key HIV/AIDS curative and preventive services was generally low.
HIV pandemic is the major public health challenge of the present decade with about 36.7 million people lived with HIV/AIDS globally in the year 2015 with only 17 million on antiretroviral treatment (ART) . Worldwide, it is estimated that 70% of the HIV-infected individuals are living in Sub-Saharan Africa . HIV/AIDS is responsible for social and economic growth impediment in developing countries affecting all sectors together without excluding fishing communities .
New HIV infections in Tanzania have been decreasing  however some populations are still at higher risk than the general population . These key and vulnerable populations include; commercial sex workers, intra venous (IV) drug abusers and mobile population like, fishermen, prisoners and truck drivers [6,7,8,9]. In India, fishermen were reported to have uppermost HIV infection vulnerability however similar observation in Kenya and Uganda has been reported [10,11,12,13]. Factors contributed to such high infection transmission among other factors were frequent mobility and excessive alcohol use before sexual intercourse [10, 14, 15].
High mobility and limited number of care and treatment facilities among fisherfolk has also being reported as the main challenge facing utilization of ART services . Access to antiretroviral treatment in Tanzania has been improving but the status in hard to reach areas like fishing islands of Lake Victoria remains not well explored despite of it being mentioned as a challenge among fisherfolk elsewhere in Africa . In Tanzania, fisheries sector provides income, foreign export revenue and most importantly responsible for over 4 million jobs with about 2.4% of the country’s Gross Domestic Product [17, 18]. As fisheries become more unified into the National economy and employment of many stakeholders, the chances that mobile fisherfolk become a bridge population linking areas with high HIV transmission and those with low magnifies. Therefore, the impact of HIV/AIDs among fisherfolk may seriously affect countries’ economic growth and expansion. This study then aimed at understanding the magnitude of HIV infection and uptake of HIV/AIDS services in hard to reach fisherfolk landing sites in Lake Victoria where there is a limited data.
This study was conducted in 13 fisherfolk landing islands located in Buchosa District (Mwanza region) and Muleba District (Kagera region) as described by Fig. 1. Three hard to reach fisherfolk landing sites (fishing camps with at least 500 fisherfolk) from each District were conveniently selected during the community based survey. Moreover, retrospective review of VCT registry was conducted in ten landing sites located within localities the surveyed sites. Muleba District is one of the 7 Districts in Kagera Region. The Region has an estimated population of 1,849,965. Muleba District has an area of 10,739 km2 whereby 76.8% the area is part of Lake Victoria. Kagera Region has a total of 143 landing sites with approximately 21,700 fisherfolk but only 23% of the sites are being provided with ART services . On the other hand, Mwanza Region has 8 Districts with an estimated population of 3,500,000 in which Buchosa District is part. Buchosa District has an area of 6657 square km whereby 81.9% the area is part of Lake Victoria, the district has a population of 327,767. Mwanza Region has a total of 243 landing sites with a total of 45,616 fisherfolk, only 31% of sites are provided with ART services . Mwanza and Kagera constitute two of three regions in Tanzania that have shown HIV transmission upsurge recently . Moreover, the selected study sites had no direct access to health services, mobile clinics including that of the Jubilee Hope medical ship served the sites collaboratively with the District Health authorities. Additionally, the landing sites/fishing camps are mainly made of temporally structures used as bars, apartments and guest houses.
Study design and study population
A cross-sectional study among fisherfolk placed in landing islands was done in Buchosa and Muleba between September and October 2017. The survey involved 456 fisherfolk who voluntarily agreed to participate in the study. Kish Leslie formula  for cross-sectional surveys was used to estimate the study sample size basing on the previously established prevalence in neighbouring countries [10, 13]. Additional retrospective cross-sectional study reviewing the VCT registry collected by Jubilee Hope mobile clinic within or near the study areas was done. Results for clients who voluntarily tested for HIV during the Jubilee Hope Mobile Clinic visits in Muleba and Buchosa between September and October in 2017 were entered in the CTC registry as required by the National HIV/AIDS control program. A total of 1744 fisherfolk who voluntarily tested for HIV were included in the study.
Sampling and participants recruitment
A list of residential and business huts was obtained from local leadership among the conveniently selected islands, a systematic random selection of 323 huts in all surveyed island out of 1922 huts was done. The selected huts were visited one after the other, all individuals above the age of 15 found in the hut were asked to participate. On the other hand, review of CTC registry conveniently involved clients who were tested 2 months prior the community survey.
This study used a pre-tested structured questionnaire to explore social demographics, HIV/AIDS knowledge, attitude, and uptake of HIV/AIDS services. Before administration the questionnaire all respondents were asked to participate in the study before signing an informed consent form. Knowledge of HIV/AIDS among fisherfolk was assessed by using 30 items which included questions regarding disease presentation, transmission of HIV/AIDS and preventive measures (Additional file 1). Responses on knowledge assessments were assigned as correct response, not sure and wrong response. Attitude towards HIV/AIDS was assessed by 15 positive and negative statements covering the cause, infection susceptibility and transmission as well as prevention (Additional file 1). Responses on attitude adopted a simple Likert scale with agree, disagree and not sure options. Determination of uptake of HIV/AIDS services encompassed condom use for past 12-month, HIV test for 12-month, ARV use and male circumcision. Diagnosis of HIV infection was done using rapid HIV testing algorithm as recommended by the Ministry of Health, Alere (US) SD Bioline® started followed by Alere (US) Determine® before Trinity Biotech (Ireland) Uni-Gold® for confirmation . Counselling before and after testing was thoroughly done while observing sterility condition during pricking.
During review of VCT registry, information abstracted included; age, sex, residence and test results. Diagnosis of HIV infection during VCT delivered by the mobile clinic adhered to the Tanzanian HIV rapid test algorithm .
Data management and analysis
Data were entered in excel® window 10 and cross-checked for errors before being exporting and analysing by Statistical Software for Social Sciences (SPSS® Version 17). Level of HIV knowledge was considered appropriate when the respondents scored more than 20 points whilst less or equal to 20 was assigned as inappropriate. Measurement of knowledge was based on 30 items with three options (correct/agree, not correct/disagree and not sure/do not know with 1, 0.5 and 0 scores respectively). Positive attitude was considered when the respondent scored more than 8 points while negative when the score less or equal to 8. Simple Likert scale was used to assess attitude; agree, not sure and disagree were used with scores of 0, 0.5 and 1 respectively. Chi-square test, confidence interval and p < 0.05 were used to measure the association. Student t-test and Mann Whitney rank sum test were also employed where appropriate. Unadjusted and an adjusted logistic regression analysis were done. Variable with a p value < 0.2 at an unadjusted logistic regression analysis, were entered in an adjusted mode using forward stepwise to select the variables in the final model. A p value of < 0.05 was considered as statistically significant. Hosmer-Lemeshow test and overall prediction percentage were used to select the best model.
Social demographics of the study participants
A total of 456 study participants were recruited in this study with more men than women (58.9% vs 41.1%). Mean age of participants was 32.97 ± 9.68 years ranging from 15 to 80 years. Majority of the study participants (43.9%) were fishermen and minority (15.1%) being employed in different fishing related activities (fish drying, cooking and store keeping). Three-quarters of the respondents were mobile population conducting fish related activities and the rest as permanent residents fully or partly engaged in fishing. The distribution of residence in terms of being permanent or mobile was comparable between the two studied Districts [χ2 = 5.89; df = 1; p > 0.05]. Table 1 shows the details the social demographics.
Prevalence HIV infection during the community-based survey
This study found 14% prevalence of HIV infection among fisherfolk with a variation from as low as 7.2% at Lunyanja to as high as 23.8% at Kasalazi (Table 2). HIV prevalence was higher among fisherfolk located in Buchosa District compared to those from Muleba District (18% vs 10.9%). The odds of having HIV infection was higher in Buchosa District than in Muleba District [OR = 1.79; 95%CI 1.04–3.06; p < 0.05]. The infection was lower among men than women (12% vs 17.1%) and yet statistically not different [OR = 0.662; 95% CI 0.388–1.129; p > 0.05]. In Buchosa District, the odds of contracting HIV among men was lower compared to women [OR = 0.432; 95%CI 0.202–0.921; p < 0.05] whilst comparable in Muleba District [OR = 1.448; 95%CI 0.586–3.579; p > 0.05]. Prevalence of HIV infection was highest (29.3%) among the combination of the widowed, divorced and cohabiting participants and lowest (9.5%) among the married respondents. Participants employed in fish related employment had higher odds of being HIV infected (5.4 times) than those who practiced fishing and partly farming [OR = 5.40; 95%CI 1.88–15.61; p < 0.001]. During the survey however, all respondents accepted HIV testing with exception of only 2%.
Magnitude of HIV sero-positivity from the Voluntary Counselling and Testing (VCT) Registry
Prevalence of HIV infection during VCT program among 1744 clients was 9.1%. Odds of HIV infection between the two Districts was comparable [OR = 1.250; CI 95% 0.812–1.925; p > 0.05]. However, lowers odds of HIV infection among men than women was observed in Muleba District [OR = 0.414; 95%CI 0.286–0.600, p < 0.001]. Table 3 describes the details.
Levels of knowledge and attitude on HIV/AIDS
Only 17.7% of the study participants had an inappropriate level of knowledge about HIV and the rest had adequate knowledge. The measurement of HIV/AIDS knowledge was reliable [Cronbach’s alpha = 0.799]. Attitude on HIV/AIDS was also assessed in this study, about 74% of the respondents had positive attitude towards HIV and AIDS.
Multivariate logistic regression of factors associated with HIV infection among fisherfolk during the community survey
Factors associated with HIV infection among fisherfolk during the bivariate analysis were: older age, marital status, education and occupation. Others were being not circumcised, no VCT for past 1 year, using alcohol, having multiple sexual partners and working in Buchosa District (Table 4). Upon multivariate logistic regression of the above factors; alcohol users [aOR = 2.26; 95%CI 1.228–4.147], lack of formal education [aOR = 3.37; 95%CI 1.637–6.921; p < 0.01] and increasing age [aOR = 1.061; 95%CI 1.029–1.093; p < 0.0001] came up as final predictors for increased likelihood of HIV acquisition (Table 5).
Uptake of HIV/AIDS services
The present study evaluated the magnitude of uptake of key HIV/AIDS services, approximately one-third (38%) of male fisherfolk had never tested for HIV within past year before the survey in landing sites located in Buchosa as compared to 16.8% of their counterparts in Muleba. The highest uptake of VCT was among women in Muleba with 90.1% (73/81) whereas in Buchosa only 70% (70/100) of women had ever tested. Only half of all study respondents practiced consistent use of condom and 35.7% (5/14) of respondents found already living with HIV infection and knew their status were not on antiretroviral drugs (ARVs). Moreover, uptake of male circumcision was satisfactory with a coverage of 89% (Table 6).
This study was able to evaluate the magnitude of HIV infection and uptake of HIV/AIDS services among fisherfolk in Lake Victoria, one of the hard to reach populations. From the community survey, the prevalence of HIV was higher than those who voluntarily requested and tested for HIV. Majority of the people in the community had sufficient knowledge on HIV and a positive attitude towards HIV and AIDS. HIV testing was more common among women. About half of the population used condoms during sexual activities and more than half of the known HIV positives were already on ARVs, however, leaving a third of them not on treatment. Male circumcision was found to be high in this population. Factors that attributed to higher odds of HIV infection included; older age, lack of formal education and using alcohol. Others were one’s type of occupation and marital status.
The prevalence of HIV among fisherfolk who participated in this study was found to be higher than the estimates made among people living in neighbouring regions . However, other studies have also shown that the prevalence among fisherfolk being higher than the general population [10, 13]. In this study, the HIV prevalence was higher during the community survey than from the VCT data. This may highlight the need to have interventions in this population to target the population with the highest risk to be tested. To be able to reach the 90–90-90 goals, scale up of HIV self-testing and linkage to care and treatment to this key and vulnerable population is highly recommended [24, 25].
Majority of the people in the community had sufficient knowledge on HIV, had a positive attitude towards HIV and AIDS and male circumcision was found to be common. This is different from other studies carried out in Asia which found that fisherfolk had lower knowledge on HIV and had a negative attitude towards it [26, 27]. With improved knowledge on HIV and having a positive attitude, may translate into willingness to test one’s status and adhering to medications .
Tanzania adopted the test and treat approach in 2016. This approach plays a role in preventing occurrence of compromised immunity and opportunistic infections to the affected individuals. This is important also as with a reduced viral load, an individual is less infectious. It is therefore alarming to note that more than a half of the people who were HIV positive and knew their status were not on ARV. The need to move constantly seeking for fish among fisherfolk  may contribute to making access to ARVs and adherence a challenge. The strategy of delivering ARVs from care and treatment clinics to stable client’s residence implemented by the country HIV/AIDS control program may be also be used to improve adherence among HIV infected fisherfolk in islands through mobile clinics. Community health workers may be also used to support delivery of ARVs to stable clients located in hard to reach areas as it has been proved effective in Tanzanian settings .
Factors that attributed to HIV infection included; older age, marital status, education and one’s type of occupation. The prevalence of HIV among older age is different from the national average whereby it is most common among those of a younger age. This difference can be because the population among fisherfolk is composed of mainly adult population. The prevalence of HIV being higher among women, those widowed/separated and those with primary education is similar to the estimates at the national level . Those who drink alcohol were more likely to be infected similar to what is known in the general population . Living in an isolated island and idling during the day could have driven the alcohol drinkers fisherfolk to more risky sexual activities .
This is the first study to provide an extensive baseline on the prevalence of HIV/AIDS among fishfolk communities among the selected hard to reach islands in Lake Victoria in Northern Tanzania. Such that the recent upsurge of HIV infection in Mwanza and Kagera Regions to some extent could be due to bridging transmission from fishing communities to low risk surrounding areas [20, 32]. The current study therefore provides avenue for further studies among the vulnerable and disadvantaged group, the fishfolk.
Strength and limitations
The study explored the prevalence of HIV in testing registry and also at the community level and hence brings a true picture of the status. However, due to migration nature of fisherfolk , the magnitude of the disease could be underestimated as the current study used a snap shot involving few islands. The true reflection should have involved periods with high and low fish yield as the high yield seasons are known to be with high influx of fisherfolk and the opposite when the produce is low. This study may therefore represent data for the study period and the studied islands.
The prevalence of HIV among fisherfolk in the studied landing sites is higher than the general population in respective Districts, particularly when tested at the community level. While the population has a sufficient knowledge on HIV and a positive attitude towards it, the uptake of HIV/AIDS services is still not at the recommended volume. We recommend establishment of testing services that consider the mobile nature of the population such as the use of mobile clinics and self HIV testing. The population at highest risk such as widows and women who are separated should be given a top priority during planning for interventions by local health authorities.
Voluntary counselling and testing
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Authors acknowledge support from the Muleba and Buchosa District Medical officers for their sustenance during the data collection. Support and guidance from Rev. John Limbe and Mr. Ronald Kebafo, through the Jubilee Hope medical ship service will always be remembered. We also thank the African Inland Church Diocese of Geita for coordination and facilitation of data collection.
This study was funded by Geita Gold Mine (GGM) in Tanzania and the Beautiful Feet Ministries in USA through the African Inland Church Diocese of Geita. The funders of this study had no role in study design, data collection and analysis. Moreover, funders had no role in interpretation of the data, writing of the report and decision to submit the article.
Availability of data and materials
Data from this study are available within the manuscript provided in form of tables, figures and other numerical presentations. However data set used and analysed during the current study are available from the corresponding author on reasonable request and with a permission from the Catholic University of Health and allied sciences and the Bugando Teaching and Consultant Hospital joint ethical committee.
Ethics approval and consent to participate
Ethical approval of this study was given by the Catholic University of Health and allied sciences and the Bugando Teaching and Consultant Hospital joint committee. Local health authorities approved the review of VCT registry and the community survey. A written informed consent was sought to all participants during the community survey. Assent was obtained to all participants under the age of 18 and the assent form was countersigned by parents or caretakers.
Consent for publication
Not applicable. All results are presented in group data without individual’s identification.
The authors declare that they have no competing interests.
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Kapesa, A., Basinda, N., Nyanza, E.C. et al. Prevalence of HIV infection and uptake of HIV/AIDS services among fisherfolk in landing Islands of Lake Victoria, north western Tanzania. BMC Health Serv Res 18, 980 (2018) doi:10.1186/s12913-018-3784-4
- HIV infection
- Landing islands
- HIV/AIDS services