This study took place in the Hauts-Bassins region, located in the west of Burkina Faso, covering an area of 25,479 km² with 1,776,803 inhabitants. It includes three provinces, including Houet, Kénédougou and Tuy, whose capitals are Bobo-Dioulasso, Orodara and Houndé. It has 03 urban communes, 33 departments, 30 rural communes and 472 villages.

Several sites and host families have been identified in the Hauts-Bassins region, namely Larama, Banzon, Bobo-Dioulasso, Founsan, and Karangasso Vigué. However, for our study, only the host sites of Sinfra in Banzon and Poya in Karangasso Vigué were involved in the collection of samples. The laboratory analyses were performed in the parasitology-mycology department of the laboratory of the Sourô Sanou University Hospital of Bobo-Dioulasso (CHUSS), the second largest university hospital in the country.

Our study population was internally displaced children living in the Hauts-Bassins region, regardless of gender. Children whose parents gave oral consent were included. Participants who reported having recently taken a digestive antiparasitic drug (less than two weeks) were excluded from the study.

This was a prospective cross-sectional study that took place from November to December 2020.

The sampling technique consisted of systematic recruitment of IDPs meeting the eligibility criteria during the study period. A total of 81 displaced children were included in the study. A questionnaire was used to collect socio-demographic, clinical and parasitological data.

Participants’ stools were collected in sterile jars. The labeled samples were placed in a cooler at room temperature and transported by a service vehicle to the CHUSS laboratory for analysis. Each stool sample was examined macroscopically to assess the consistency and color of the stool. And to look for the presence of parasitic elements in the stool. Microscopic examination including direct fresh examination and examination after concentration using the Ritchie technique was also performed.

A small amount of faeces was collected and diluted in a drop of physiological water previously placed on a slide to obtain a fine spread. The spread was then covered with a coverslip and examined under a light microscope immediately for cysts and eggs. This examination was performed with a microscope with a 10× and then 40× objective.

A small amount of stool was taken in a glass stem and 10% formalin was added to about 10 times the volume of the sample. The stool was triturated until a homogeneous solution was obtained. This solution was filtered into a conical tube using a pad. Ether was then added to 1/3 of the total desired volume. The whole was shaken well and centrifuged at 1500 rpm for 5 min. After removal of the tube, four phases were formed (an upper layer represented by ether, an intermediate layer made of bacterial residues and food debris, an aqueous layer made of formalin and the pellet which contained the parasitic elements). The supernatant was discarded by inverting the tube with a quick movement

The data were entered and processed with EPI-INFO software version 7.2.0.1. and version 4.3.3 of R software. The statistical test used was the Chi-square test at the 5% significance level. Logistic regression was used to reconsider factors associated with the possibility of parasitic infection

Authorization was obtained from the Ministry of Gender, National Solidarity, Family, and Humanitarian Action to conduct this study. Authorization was obtained from the Ministry of Gender, National Solidarity, Family, and Humanitarian Action to conduct this study. In addition, participants were informed of the results of the biological analysis and those detected with parasites were treated according to the parasitosis.

The mean age was 5.8 ± 2.4 years. The most represented age group was 5 to 10 years (75.31%). The sex ratio is 1.61 ( Table 1 ).

The overall prevalence of digestive parasitosis was 53.09% (54/100). Prevalence stratified by host site showed a statistically higher prevalence at the Poya host site (p = 0.01). Prevalence within each age group ranged from 41% to 57%. Regarding the source of water supply, the prevalence was statistically higher among those who consumed well water than those consuming tap water (p = 0.01) ( Table 2 ).

Clinically, 90% of patients were asymptomatic. Abdominal pain was the main clinical sign observed with 63.64% of cases. Other clinical signs observed were pruritus (9.09%), rash (9.09%) and constipation (9.09%).

Different species have been identified according to the type of parasitism and the phylum. Monoparasitism by protozoa and helminths represented 74.42% and 6.68% respectively. The species identified in monoparasite patients were protozoa with Entamoeba coli (37.21%), Giardia lamblia (25.58%), Endolimax nanus (6.98%) and Entamoeba histolytica/dispar (4.65%). Polyparasitism constituted 9.31% of positive results ( Table 3 ).

E. coli was the most common parasite regardless of the age of the child: 51.7% in children under 5 years, and 37.5% in children over 5 years of age. Helminths were more isolated at the Poya host site (34.39%) than at the Sinfra site ( Table 4 ).

The host site (p = 0.03037) and the water supply (p = 0.03037) were associated with the possibility of parasitic infection ( Table 5 ).

The overall prevalence of digestive parasitosis was 53.09% among the internally displaced person (IDP) children who were the subjects of the study. This elevated prevalence rate is indicative of the concentration of risk factors that contribute to the dissemination of digestive parasites in these locations. Indeed, promiscuity facilitates interpersonal contact and the transmission of parasites, particularly those transmitted orally. The prevalence of the condition was found to be statistically higher among IDPs in the Poya host site when the data was stratified by host site. This discrepancy may be attributed to the source of the water supply. It is notable that IDPs in the Poya site obtain their water from wells, whereas those in the Sinfra site access it from a tap. The results of our study demonstrated that the prevalence was statistically higher among individuals who consumed well water compared to those who consumed tap water (p = 0.01). This can be attributed to the absence of requisite coverage for the wells, in conjunction with the lack of a curb and the unsanitary condition of the collection bucket. The overall prevalence observed in our study aligns with the findings of the study conducted in Burkina Faso, which reported a prevalence of 54.7%. Nevertheless, the findings of a study conducted in Burkina Faso indicated a higher prevalence rate of 71.5% [8] [9] . This discrepancy may be attributed to the temporal aspect of the study, as our investigation was conducted subsequent to the implementation of several strategies for the control of specific parasitic infections in the country [10] - [12] .

The majority of patients (90%) with a positive parasitological stool examination were asymptomatic, which facilitates the dissemination of parasites within populations. This underscores the necessity for cross-sectional surveys to assess the prevalence of these parasitoses in at-risk populations. Additionally, anal pruritus, a highly specific symptom of pinworm disease, was observed in patients with identified E. vermicularis.

The prevalence of protozoan infestation was found to be 74.42%, which is significantly higher than the 6.68% observed for helminth infestation. This discrepancy may be attributed to the implementation of numerous helminth control initiatives within the country [10] . Amoebae constituted the predominant parasite species (66.7%). Of these, E. coli was the most prevalent, accounting for 37.21% of the total. This parasite, which is considered non-pathogenic, serves as an effective indicator of the fecal contamination prevalent in the Burkinabe population, a conclusion corroborated by other authors in Burkina Faso [6] [9] . E. histolytica/dispar was the second most frequently isolated amoeba, occurring in 4.65% of cases. As a result of the cystic form being diagnosed between slides, it was challenging to differentiate between E. histolytica and E. dispar. The presence of this organism serves to confirm the lack of hygiene observed in this population. The absence of the hematophagous form may explain the absence of associated clinical signs.

The only flagellate isolated in the study was Giardia lamblia, with a frequency of 24.07%. It is likely that this proportion is an underestimate, given that only a single examination was conducted for each participant, and the parasite in question has a latency period. Other authors have reported higher frequencies in the city of Kinshasa (27.2%) [13] . Conversely, other authors have observed lower prevalence rates, namely 18.9% and 4.7% [6] [9] . A prevalence of 2.33% was observed for pinworm. It is a pathogenic parasite most often associated with anal pruritus; thus, the prevalence would likely be underestimated in our study. Had the scotch test been applied in a systematic manner to all participants, the frequency would have been higher. The prevalence of Trichuris trichiura was 3.7%. Oyegue-Liabagui [14] reported a similar rate (4%) in Franceville, located in the southeast of Gabon. Poor hygiene is a significant risk factor for Trichuris trichiura transmission, and internally displaced children are particularly vulnerable due to their high exposure risk. This is particularly relevant in developing countries like Burkina Faso, where poor sanitary conditions are associated with a high disease burden and infections.