Study area
The study was conducted in Panyadoli Refugee Settlement Camp (Coordinates: 1.93998, 1.93998) located in Panyadoli Village, Bweyale subcounty Kiryandongo District (Figure 1). Panyadoli is one of the largest camps harboring refugees and asylum seekers from South Sudan, DRC, Burundi and Bududa survivors among others [12]. In 1990, the Ugandan government gazetted the virtually uninhabited land around Panyadoli in Kiryandongo for refugee resettlement. The Settlement currently provides shelter, land, and support for more than 100,000 people. The major economic activities carried out in the settlement are agricultural. The majority of the refugee farmers depend on growing cassava, sweet potatoes, maize, beans, rice, vegetables and groundnuts, mainly for domestic consumption. Additional activities in the Settlement include livestock rearing, fishing, and beekeeping. Panyadoli Health Centre III is the main facility at the Camp, providing healthcare services to over 100,000 refugees and persons in the community.
Figure 1: Map of Uganda showing location of Kiryandongo District and the resettlement camp.
Study design and sample size
This was a descriptive cross sectional study conducted between February to April 2022 in Kiryandongo district. Data collection involved both qualitative and quantitative tools. Microscopic and Rapid Diagnostic examinations were employed for diagnosis of malaria. Additionally, questionnaires were used to collect data on socio-demographic characteristics and malaria associated risk factors. The sample size of participants was calculated using a single population proportion formula, the 95% confidence limits (Zα/2 = 1:96), and a 5% margin of error (d) with a maximum proportion of 50% as follows:
Sample size = Z(α/2)2 P (1- P)/ d2, (1.96)2 *0.221 (1–0.221)/ (0.05)2 = 384.
However, a total of 380 children <5 years old who presented at Panyadoli Health Centre III Heath Centre with signs and symptoms of malaria was enrolled. Simple random sampling was conducted to select the participants using the random number generator approach. Briefly, random numbers were generated from a sampling frame of 700 obtained from the outpatients malaria register. These numbers were aligned against the patients’ identification number in the register. Any patient who was assigned a random number was included in the study. Parents/guardians of the selected febrile patients were triaged and recorded in the register using the patients` identification number. After a complete physical examination of the patients by the physician and referral to the laboratory for testing, the parent/guardian of the participants were interviewed to determine the predisposing factors to malaria infections.
Inclusion criteria.
Participants were eligible for the study if they were refugee children ≤ 5 years of age, had suspected symptoms of malaria such as anorexia, vomiting, or abdominal discomfort with or without diarrhea (based on the standard MOH definition of suspected malaria). In addition, the patient with a body (axillary) temperature > 37.4°C or history of fever in the 24–48 hours were included.
Exclusion criteria
Patients who came for confirmation or retesting for malaria following treatment were excluded from the study.
Data collection
Well-designed structured questionnaires were used to collect the qualitative data on risk factors for malaria infection. The questionnaire was initially developed in English and translated into local languages for data collection. Trained Research Assistants then administered the questionnaires during face-to-face interviews with parents/guardians of the under-five refugee children. The questionnaires were initially pretested and validated at Kiryandongo Hospital to ensure its reliability and validity.
Specimen Collection and Laboratory procedures
Blood specimens were obtained from the thumb using sterile blood lancet and cleaned with 70% ethanol or an alcohol swab and left to air dry to prepare thick and thin blood film smears. Blood specimen collection and processing was done by trained and competent laboratory technicians who had records of certification by WHO in malaria diagnosis and were under the technical supervision of the researcher, a senior Medical Laboratory Technologist. Malaria diagnosis was conducted using two approaches; the malaria Rapid Diagnostic Test (mRDT) and microscopic examination.
Malaria RDTs (Carestart, Lot no. 05CDH019A/05CDH030A) with a pre-determined sensitivity and specificity of 97.89%-100% and 99.50%-100% respectively as provided by its manufacturer were employed. Briefly, the test device and the sample pipette were removed from the foil pouch. The test device was labeled with the patient identification number and then placed on a flat surface. Using the provided loop or micropipette, 5µ whole blood sample was obtained from a finger prick and added to the sample well of the test card. Two drops (60µl) of assay diluent were added into the diluent well and allowed to flow by capillary action. The test result was read within 15-20 minutes and recorded as Positive or Negative depending on the test outcome.
For microscopic examination, a clean glass slide was labeled with the patient’s assigned unique number and accession in the register. The blood specimens were collected from the child upon consent/assent from their parents/guardians. Finger prick blood samples were then spotted onto carefully labeled slides to make thick and thin blood films, followed by air-drying. Field’s stains A and B were used for processing the blood slides. The thin film was stained with Field stain A for 5 seconds, fixed in methanol for 1 minute and then allowed to air dry. It was then gently dipped in Field stain B for 5 seconds and later washed in clean water. The slide was then dipped in Field stain A for 15-30 seconds and washed in clean water. The blood smears were examined under 100x microscopes for the presence of malaria parasites.
The thick smear was used to determine whether the malaria parasites were present or absent and the thin smear was used to identify the type of Plasmodium species. A positive result was defined as the presence of one or more asexual stages (trophozoite, ring stage, merozoite, or gametocyte) of plasmodium. A slide was regarded as negative after 200 fields had been examined without finding of Plasmodium parasite by two laboratory technologists. To assure quality of the microscopic examinations, all the positive and 10% of the negative slides were reexamined by a third reader to remove discrepant result.
Examination for the film was done for at least 10 minutes (approximately 200 oil immersion fields), before declaring the slide negative. Quality Control was performed on the stains to be used for sample processing by filtering each working day, and pre-tested known malaria negative and positive samples were analyzed in the same manner as the routine patient samples before analyzing the study samples, to ensure quality of results.
Data analyses
Data was entered into a Microsoft Excel Sheet, coded checked for completeness, and exported to SPSS version-20.0 (SPSS Inc., Chicago, IL, USA, 2011) for statistical analyses. Chi-square (χ2) tests were used to determine the association between the independent variables (risk factors) and the dependent variable (prevalence of malaria). Variables that were found significant were selected for inclusion in the final multiple logistic regression to determine the predictors of malaria infection. Confidence interval was set at 95% and a P<0.05.