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Intestinal parasite infections and associated factors among inmates of Arba Minch prison, southern Ethiopia: cross sectional study

Abstract

Background

Intestinal parasitic infection is one of the parasitic infections affecting people living in prison. Helminths and intestinal protozoan infections are the most common parasitic infection that may cause serious life-threatening diseases in inmates living in developing countries. This study was aimed to investigate the prevalence and associated factors of intestinal parasitic infections (IPIs) among inmates living in Arba Minch prison, southern Ethiopia.

Methods

Institutional based cross sectional study was conducted on Arba Minch inmates, southern Ethiopian. Pre-tested semi-structured questionnaire was used to gather the data of socio-demographic characteristics, hygiene status of the prisoners, sanitation condition of the prison, and associated factors for IPIs by face to face interview. Direct wet-mount examination and formol-ether sedimentation techniques were used to examine intestinal parasitic infection from stool specimens. Binary logistic regression analysis was used to see the association between different variables and the IPI. Odds ratio with 95% CI was computed to determine the presence association and strength of the associated factors.

Result

A total of 320 prisoners were participated in this study. Of these, 154(48.1%) of them were infected with one or more intestinal parasites. Eight different intestinal parasites species were identified and Giardia lamblia was the predominant parasite. Among infected inmates, nearly one out of four of them had multiple parasitic infections dominated by Giardia lamblia and E. histolytica/dispar co-infection. Sleeping in group [AOR = 1.9; 95% CI: (1.0–3.8)], married prisoners [AOR = 1.8; 95% CI: (1.1–2.9)], and hand washing habits after handling soil [AOR = 2.4; 95% CI: (1.0–5.6)] were independently associated with IPI.

Conclusion

High prevalence of intestinal parasitic infection was detected in Arba Minch inmates, southern Ethiopian. Absence of hand washing, marital status, and way of sleeping were the factors associated with the IPI. Implementation of mass drug administration, education on water, sanitation and hygiene (WASH) and periodic screening of intestinal parasitic infection is very important to reduce the high prevalence IPIs in prison.

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Background

Intestinal parasite infection (IPI) particularly schistosomiasis and soil transmitted helminthiasis are the major neglected tropical diseases causing significant morbidity in most countries. Although different efforts were undertaken to minimize the burdens of the disease, they are causing significant problem in developing country. IPIs remains one of the greatest health problems estimated to be over a billion of people infected by at list one of the species [1, 2]. Geo-helminths and enteric protozoa are readily passed from person to person via the fecal-oral route in various situations and present throughout the world in varying degrees of prevalence. Over 70 species of protozoan and helminth parasites can infect humans via contaminated food and water [3]. Among intestinal parasitic infection, schistosomiasis and soil transmitted helminthiasis are more prevalent throughout tropical countries [4, 5].

More than 24% of the world population is infected by soil-transmitted helminthes, and about 50% of people in developing countries are believed to be infected by helminthes [6]. In industrialized countries protozoan infections are associated with the use of common pools in water parks and handling of infected pets. However, in developing countries the infection is mainly associated with low level of environmental and personal hygiene, contamination of food and drinking as well as poor toilet facility [7].

Helminthic infections are the second most predominant causes of outpatient morbidity in Ethiopia. Ethiopian federal ministry of health report indicated that the prevalence of parasitic infections were high in low altitudes [8]. Prevalence of intestinal parasite infection in population living in highland and lowland of Gamo area was 27.7% [9]. Other studies conducted in different part of Ethiopia also showed a varied prevalence that ranged from 29.1 to 49.4 [10,11,12,13]. The problem is more sever for inmates due to different reasons. The inmates’ right is restricted, their living style favor intestinal parasitic infection and they may not have the access of health care timely. Inmates in developing countries are neglected and they are not benefited from health program given for other citizen [14].

The current mass drug administration strategy show a significant improvement in the burden of intestinal helminthes in school aged children [15]. However, the prevalence of the intestinal parasite in non-targeted population remains high. People living in developing countries’ prisons are not benefited from the health care system given for other population. Because of inmates’ activities are limited, they may not get on time health care and treatment [16]. More than 10 million people are incarcerated throughout the world with the majority lives in developing country. With this high number, they could be the source of infection for other people through their visitors. According to the 2012 world prison report, Ethiopia was leading in prisoner number in East Africa [17]. The varied composition of inmates who came from different regions of Ethiopia could create a fertile ground for transmission of different species of intestinal parasites.

Studies conducted in different prisons showed a varied prevalence of intestinal parasitic infection. In Malaysia prison the prevalence of intestinal parasite was about 26.5% [18], in Brazil 20.2% [19], and in Kenya it was 24.7% [20]. Few studies were conducted in Ethiopia and the prevalence of intestinal parasitic infection was relatively high compared to other studies. The estimated prevalence of intestinal parasitic infection in Shewa Robit prison was 61.8% [21] while the study in Bedele prison indicated 64% prevalence [22]. However, there was no study conducted in southern part of Ethiopia.

Inmates in developing countries are more likely vulnerable to intestinal parasite infection diseases due to a number of factors. Albeit the factors varied from place to place, the most common are poor health care, overcrowding, high level of stress and inadequate or poor nutritional quality, and low living standard as compared to the general population [18,19,20,21,22]. Although helminths infection is very common in Ethiopia, study related to prevalence and associated factors of the infection in inmate are not well investigated in the study area. This study was aimed to assess the prevalence of intestinal parasite infection and associated factors of the infection among Arba Minch prison inmates, Southern Ethiopia.

Methods

Study design, settings and period

Institutional based cross sectional study was conducted on randomly selected prisoners of Arba Minch town. This study was conducted in prison located in Arba Minch city. Arba Minch is a administrative seat of Gamo zone, Southern Nations, Nationalities, and Peoples’ Regional state. The prison is located in Sikella sub-city and the total number of prisoners was 2323 during the data collection period. The majority of the inmates were male. The study was conducted from March to June, 2018.

Study population

The study subjects were recruited from prisoners resident in Arba Minch prison. Inmates who had taken anti-parasitic medications in the last 2 weeks of data collection period, a prisoner unable to respond to questions in the questionnaire, and those who were incarcerated within the last 1 month of data collection period were excluded from the study.

Sample size determination and sampling technique

The sample size for the present study was determined by using single population proportion formula based on the study conducted in Shewa Robit prison in which the prevalence of IPIs was 72.7% (p = 0.73) [21]. The 95% of level of confidence and 5% precision was used. Then by considering 15% for non-response rate the total sample size became 351. Then study subjects were recruited in the study by using systematic random sampling technique. The male and female participants were proportionally allocated in the study based on their total number in the prison.

Study variables

The outcome variable of study was intestinal parasitic infection. The independent variables such as socio-demographic and socio-economic characteristics, sanitation and hygiene status of participants and other potential associated factors were included.

Data collection

A pretested semi-structured questionnaire administered through face to face interview was used to collect data on socio demographic characteristics and associated factors for intestinal parasite infection (see Additional file 1). During data collection, each prisoner was asked separately and the confidentiality of the information was well explained to minimize social desirability bias. To minimize contamination of information, data of all participants found in one room were collect in the same period.

Specimen collection and examination

About 5gm of stool specimens was collected from study participants in pre-labeled, leak-proof plastic stool cups. The fecal specimens were physically examined and the consistency (watery diarrheic, diarrheic bloody and formed) of the samples was recorded and used for input in microscopic examination. Wet-mount preparation was prepared immediately after collection in prisoner clinic laboratory using normal saline and microscopic examination was made to identify parasite ova, motile trophozoites of intestinal protozoa and larvae of S. stercoralis.

To enhance sensitivity of the microscopic examination, stool concentration was performed using 10% formalin. Formal ether sedimentation technique was carried out by mixing stool specimen about the size of a walnut with 10 mL of normal saline and the suspension was centrifuged at 2,500 rpm for 5 minutes. Then the supernatant was discarded and sediment was washed, and again centrifuged at 2,500 rpm for 5 minutes. After 7 mL of 10% formalin was added and kept for 5 minutes, 2 mL of ethyl acetate was added. Then the suspension was centrifuged at 1500 rpm for 10 minutes. After carefully decanting the top three layers, the remaining sediment was mixed and pipetted using pasture pipette. Finally wet-mount from the suspension was prepared on slide for microscopic examination.

Data processing and analysis

The data collected from the study area were entered in excel sheet before being exported to SPSS version 22. Analyses of the variables were made using descriptive statistics and bivariate logistic regression analysis. Bivariate logistic regression analysis was employed to determine the association between various variables and intestinal parasite infection. Univariable logistic regression analysis was conducted and a variable with p-value ≤0.20 were included in multivariable logistic regression analysis to identify variables that independently associated with the intestinal parasite infection. Adjusted odds Ratios (AOR) and their 95% CI were used to look into the presence and strength of association between the dependent and independent variables.

Results

Socio-demographic characteristics of participants

A total of 320 inmates were participated in the study with 91.2% response rate. Age of the participants ranged from 15 to 82-year-old with the mean age of 31.98 ± 13.48 years. About two-thirds of participants belong to the age group of 30-year-old and younger and majority of them were male. Nearly two-third of the participants were came from rural area and most of them were lived on agricultural work before incarcerated. A quarter of study participants were illiterate while large number of them were unemployed before imprisoned. The number of prisoners per room was ranged from 15 to 250 with average of 142 prisoners per a room (Table 1).

Table 1 Socio-demographic characteristics of study participants (n = 320)

Sanitation and hygienic practice of the inmates

Majority of the participants had hand washing habit after visiting toilet but only half of them had habit of washing with soap. About one-fifth of the prisoners had habit of eating fruit without washing and meat before cooking. Nearly one-third of study participants had untrimmed finger nail. Drinking water source was different for male and female participants; the male participants had drunk water stored in tanker while the female participants had drunk from running pipe water. About 10% of the inmates’ rooms had no waste disposal container (Table 2).

Table 2 Sanitation, hygeine practice and medical condition of study participants (n = 320)

Intestinal parasitic infections among inmates

The overall prevalence of intestinal parasite among Arba Minch prison inmates was 48.1% [95% CI: (42.6–53.6)]. Eight different intestinal parasite species were identified in study participants (Fig. 1). Giardia lamblia was the predominant (41.3%) intestinal parasite followed by E. histolytica which accounts about 30.3% of the identified intestinal parasites. A. lumbricoides and Hookworms were the predominant intestinal helminths with 17 and 6.9% prevalence, respectively. About 23% of prisoners were infected with more than one parasite. The majority of the co-infection was by G. lamblia and E. histolytica followed by A. lumbricoides and E. histolytica (Table 3).

Fig. 1
figure1

Intestinal parasite species identified in Arba Minch prisoners, southern Ethiopian

Table 3 Frequency of co-infection of intestinal parasite in the study participants (n = 320)

Factors associated with intestinal parasitic infection of the inmates

As mention in the method part logistic regression analysis was used to find out the associated factors. In univariable analysis resident of the inmate before incarceration, marital status, number of inmates per incarceration room, availability of waste disposal container in incarceration room, hand washing habit after handling soil, having chronic disease, and way of sleeping were transferred into multivariable logistic regression together based on criteria stated in method section.

In multivariable logistic regression, hand washing practice after handling soil, marital status and prisoners’ way of sleeping were independently associated with intestinal parasite infection of the inmates. Married inmate had two times odds of intestinal parasitic infection than single prisoners [AOR = 1.8; 95% CI: (1.1, 2.9)]. Inmates who had no hand washing practice after handling soil had about two time odds of infection with intestinal parasite [AOR = 2.4; 95% CI: (1.0, 5.6)]. The prisoners who were sleeping in group had about two times more chance of intestinal parasitic infection than those who sleep individually [AOR = 1.9; 95% CI: (1.0, 3.8)] (Table 4).

Table 4 Factors associated with intestinal parasite infections of the inmates

Discussion

Prison conditions should promote the health of both prisoners and prison staff and providing proper health care for inmates is also very important. The issue of IPI in vulnerable population particularly inmate seeks special attention. The prevalence of intestinal parasitic infection among inmates in Arba Minch prison, southern Ethiopia was 48.1% [95% CI: (42.6–53.6)]. The current finding was slightly lower than study conducted in Showa Robit [21] and Bedele prisons [22]. The observed difference may be due to difference in the activities of the inmates. In the Showa Robit study, participants involved in tobacco farmer were included and this increases the chance of frequently contracting with soil. In addition, unlike our finding the frequency of soil transmitted helminths were high in the Showa Robit study. On the other hand, our find is higher than the other studies conducted in Malaysia [18], Brazil [19], and Kenya prisoners [20]. The high prevalence obtained in our study may be due to the lack of sanitation in the compound, lack of clean water for inmates, and high number of prisoner per room.

In this study 8 different intestinal parasite species were identified. The predominant intestinal parasite was protozoa particularly G. lamblia followed by E. histolytica/dispar. Similarly, in the study conducted in Brazil prison G. lamblia and E. histolytica/dispar were the most frequent intestinal parasite [19]. Of infected inmates, about one quarter of them had more than one intestinal parasite infection. Giardia lamblia and E. histolytica co-infection was the most frequent in current study. Rop et al study showed that there was low number of mixed infection (3.5%) in Kisii prison of Kenya as compared to our finding [20]. This high protozoa co-infection in our study may be due to unimproved drinking water in the prison. Ineffective treatment and exchange in the life cycle of protozoa between cyst and trophozoite could be the other possible reason for the high protozoa infection. In contrary, the study conducted in Malaysia prison reported low prevalence of protozoa infection [18]. In the study conducted in Shewa Robit prison, E. histolytica/dispar was the predominant intestinal parasite and the frequent co-infection observed was E. histolytica/dispar and A. lumbricoide [21]. The observed difference may be due to the difference in study population; in Shewa Robit study, the participants were sourced from prison and tobacco farmer.

In view of the fact that intestinal parasite infection has faeco-oral route of transmission, effective hand washing is very important to prevent the infection. In our study, absence of hand washing after handling soil is significantly associated with intestinal parasitic infection. In this study majority of the participants were came from rural area and they had less awareness on the route of transmission. Other studies also revealed as ineffective hand washing are risk for intestinal parasitic infection. A factorial cluster randomized controlled trial study showed that hand washing with soap has significant impact in reducing the infection of intestinal parasite [23]. Similar to current study, study conducted in Kenya prison also showed association between hand washing and intestinal parasitic infection [20]. In addition, the low access to improved water supply, poor medication, low economic background and poor hygiene in the person favor this association.

The marital status of the prisoner was determinant factor for IP infection of the study participants. Married inmate had two times odds of IP infection than single prisoners. Most probably married individuals have large family than singles. Studies also showed that large family has more chance intestinal parasite infection than that of small family [23, 24]. Similar studies conducted in Accra and Bahir Dar showed that intestinal parasitic infection was associated with the family size [24, 25]. In addition, majority of the participants those categorized under married status were also came from rural area.

In the current study, prisoners’ way of sleeping was another factor that is associated with intestinal parasite infection in the prison. Those prisoners who sleep in group had two times more chance of intestinal parasitic infection than inmates who sleep separately. Crowded life style is a risk for intestinal parasitic infection [26]. Sleeping on ground may facilitate transmission of soil transmitted parasites. In addition, this may be due to the majority of study participants who sleep in group were prisoners incarcerated for the first 2 years where infection before incarceration might have contributed to the high prevalence in this group of prisoners.

This study has some of limitations. One of the limitations was lack of antigen test to differentiate Entamoeba histolytica and Entamoeba dispar cyst. Limitation related to social desirability bias, and recall bias can be expected in this study. However, to minimize these biases the prisoners were asked individually and the purpose of the study was well explained before the data collection.

Conclusion

The prevalence of intestinal parasitic infection in Arba Minch prison is comparable with other inmates’ IP infection in developing country. Protozoan infection was higher among identified parasitic species. Marital status of the inmate, hand washing habit after handling soil and sleeping in group were independently associated with intestinal parasitic infection of the prisoners. The effective communication between prison governing body and the prison clinics is required to decrease the prevalence of the infection among inmates. Mass drug administration, giving periodic WASH education in prison and modifying way of sleeping for inmates are mandatory to reduce the observed high prevalence of intestinal parasitic infection.

Availability of data and materials

The datasets supporting the conclusions of this article are included within the article.

Abbreviations

AOR:

Adjusted odd ratio

CI:

Confidence interval

COR:

Crude odd ratio

IP:

Intestinal parasitic

IPI:

Intestinal parasitic infection

SPSS:

Statistical package for social sciences

STH:

Soil transmitted helminthes

WASH:

Water, sanitation and hygiene

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Acknowledgments

We would like to thank Arba Minch University colleges of medicine and health sciences department of Medical laboratory Science for giving us material support during laboratory analysis. We are very grateful to Arba Minch prison governors and clinic for cooperating during data collection.

Funding

No fund is received for this study.

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Authors

Contributions

GA: Involved in design of the study, coordinate data collection, analyzed the data and drafted the paper ZZ: Involved in the design of the study, analyzed the data and drafted the paper. MT: Coordinate data collection, analyzed the data and revised subsequent drafts of the paper. CJ, AA, KD, PS and ME: participated in the design of the study, analysis of the data and revised subsequent drafts of the paper. All authors have been involved in drafting the manuscript, read and approved the final manuscript.

Corresponding author

Correspondence to Gemechu Ameya.

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Ethics approval and consent to participate

An ethical clearance was obtained from Arba Minch University, College of medicine and health sciences. Before data collection, permission letter was taken from concerned body of Arba Minch city prison. Prior to sample collection participants were informed clearly about the objective and procedure of the study. The participation in the study was full based on voluntary bases. Written informed consent was obtained from each inmate before data collection and the right to quit at any point of the study without any restriction was guaranteed. Confidentiality was maintained at all levels of the study.

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Ameya, G., Zerdo, Z., Tesfaye, M. et al. Intestinal parasite infections and associated factors among inmates of Arba Minch prison, southern Ethiopia: cross sectional study. BMC Infect Dis 19, 1086 (2019). https://doi.org/10.1186/s12879-019-4703-y

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Keywords

  • Intestinal parasite
  • Multiple parasitic infection
  • Prisoners
  • Protozoa
  • Soil transmitted helminths