SummaryIndonesia is aiming for malaria elimination by 2030. A parasitological survey of 3731 individuals in North Sumatera province used polymerase chain reaction to identify 1169 with parasitemia and highly specific amplification of sicavar genes to identify Plasmodium knowlesi infection in 377.

Background We assessed the efficacy of artemisinin-based combination therapies for treatment of uncomplicated falciparum malaria, with or without co-infecting Plasmodium spp., in Sumatera, Indonesia. Methods Febrile patients aged >6 months with uncomplicated P. falciparum were randomized to receive dihydroartemisinin-piperaquine or artemether-lumefantrine, plus single-dose primaquine, and were followed for 42 days. Mixed Plasmodium infections were included; P. vivax infections received 14 days of primaquine. We retrospectively restricted the analysis to cases with polymerase chain reaction (PCR)–confirmed parasitemia. Recurrent parasitemia in follow-up was identified by species-specific nested PCR. Results Of the 3731 participants screened, 302 were enrolled and randomized. In the dihydroartemisinin-piperaquine arm, P. falciparum infections were confirmed by PCR in 59 participants, with mixed infections in 23 (39.0%). In the artemether-lumefantrine arm, P. falciparum infections were confirmed by PCR in 55 participants, with mixed infections in 16 (29.0%). Both regimens were well tolerated, and symptoms improved rapidly in all treated participants. In the dihydroartemisinin-piperaquine arm, 1 P. falciparum recurrence (on day 7) and 6 P. malariae recurrences (1 had a mixed infection with P. falciparum) were identified during days 3–42 of follow-up. In the artemether-lumefantrine arm, 1 P. falciparum/P. malariae/P. vivax recurrence occurred on day 35. Submicroscopic persistence occurred during follow-up in 21 (37%) of 57 receiving dihydroartemisinin-piperaquine and 20 (39%) of 51 receiving artemether-lumefantrine. Conclusions In Sumatera, both regimens effectively cleared initial parasitemia, but P. falciparum and P. malariae persisted in some individuals. Molecular species detection should be deployed in antimalarial efficacy trials in Indonesia. Trial registration NCT02325180.

Background The Indonesian province of Aceh has a high prevalence of stunting. Identifying risk factors for stunting may help prevention efforts. The Growth Diagrams of Indonesian Children are a specific tool to diagnose stunting in Indonesian pediatric populations. Objective To determine the risk factors of stunting in children aged 1-60 months using the Growth Diagrams of Indonesian Children. Methods This observational, analytic study with case-control design was conducted in the Lawe Alas District, Southeast Aceh, Indonesia to compare prior risk factors exposure between stunted children (cases) and non-stunted children (controls) from January-April 2018.  Subjects were children aged 1-60 months and recruited by consecutive sampling. Results The subjects comprised 97 cases and 97 controls, totaling 194 subjects, internal risk factors of stunting were short birth length (OR 2.87; 95%CI 1.24 to 6.61; P=0.011), inadequate calorie intake (OR 2.37; 95%CI 1.32 to 4.27; P=0.004), non-exclusive breastfeeding (OR 3.64; 95%CI 2.01 to 6.61; P<0.001), chronic diarrhea (OR 6.56; 95%CI 3.33 to 13.01; P<0.001) and upper respiratory tract infections (OR 3.47; 95%CI 1.89 to 6.35; P<0.001). External risk factors of stunting were unimproved sanitation (OR 2.98; 95%CI 1.62 to 5.48; P<0.001), unimproved water sources (OR 2.71; 95%CI 1.50 to 4.88; P=0.001), low family income (OR 2.49; 95%CI 1.38 to 4.49; P=0.002), low paternal educational level (OR 2.98; 95%CI 1.62 to 5.48; P<0.001), low maternal educational level (OR 2.64; 95%CI 1.38 to 5.04; P=0.003), and living in households with >4 family members (OR 1.23; 95%CI 0.69 to 2.17; P=0.469). Regression analysis showed that the dominant risk factor of stunting was chronic diarrhea (OR 5.41; 95%CI 2.20 to 13.29; P<0.001). Conclusion The history of chronic diarrhea and non-exclusive breastfeeding are the main risk factors of childhood stunting.

Artemisinin-based combination therapy (ACT) is the first-line antimalarial regimen in Indonesia. Susceptibility of Plasmodium falciparum to artemisinin is falling in the Greater Mekong subregion, but it is not known whether the efficacy of current combinations is also threatened in nearby Sumatera. We evaluated the genetic loci pfcrt, pfmdr1, and pfk13, considered to be under selection by artemisinin combination therapy, among 404 P. falciparum infections identified by PCR detection in a cross-sectional survey of 3,731 residents of three regencies. The pfcrt haplotype SVMNT (codons 72 to 76) was the most prevalent and displayed significant linkage disequilibrium with the pfmdr1 haplotype YY (codons 86 and 184) (odds ratio [OR] 26.7; 95% confidence interval [CI], 5.96 to 239.4; P < 0.001). This contrasts with Mekong countries, where the CVIET haplotype of pfcrt predominates. Among 231 evaluable isolates, only 9 (3.9%) showed any evidence of nonsynonymous gene variants in the propeller domain of pfk13. The Thr474Ala variant was seen in six individuals, and Cys580Tyr was identified with low confidence in only a single isolate from an asymptomatic individual. Among a subset of 117 symptomatic P. falciparum-infected individuals randomized to receive either dihydroartemisinin-piperaquine or artemether-lumefantrine, the treatment outcome was not associated with pretreatment genotype. However, submicroscopic persistent parasites at day 28 or day 42 of follow-up were significantly more likely to harbor the pfmdr1 haplotype NF (codons 86 and 184) than were pretreatment isolates (P < 0.001 for both treatment groups). Current ACT regimens appear to be effective in Sumatera, but evidence of persistent submicroscopic infection in some patients suggests further detailed studies of drug susceptibility should be undertaken.

BACKGROUND: Soil-transmitted helminth (STH) infection remains of public health importance, particularly in developing countries. North Sumatra province of Indonesia has reported high prevalences of STH in many of its districts. AIM: In this study, we aimed to determine the prevalence of STH and evaluated STH knowledge and risk behaviours of school children in Mandailing Natal district. METHODS:  We conducted a cross-sectional study in two primary schools in Mandailing Natal district, North Sumatera province, Indonesia. Data were collected directly from the subjects using a questionnaire after receiving consent from their parents. A stool sample was also collected to determine the STH status of each subject. Samples were then transported to the parasitology laboratory at Universitas Sumatera Utara in Medan to be analysed by a trained analyst. Kato-Katz method was used to prepare the slides (World Health Organization, 2002). The intensity of infection is classified into light, moderate and heavy infection. RESULTS: Prevalences of STH infections were 76.8% and 87.2% in Singkuand and Sikapas primary schools, respectively. The majority of infections were Ascaris lumbricoides and Trichuris trichiura at a light intensity. Only small numbers of children in the two schools used soap before eating, used soap after defecating, and wear sandal/shoes when walking outdoor. Less than 50% of children also knew the route of transmission of STH. Poorer knowledge and behaviours were shown in children from Sikapas than in Singkuang. CONCLUSION: High prevalence and poor hygiene behaviours found in this study reinforce the need to identify the correct intervention to address this STH problem in the region.