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Background  As a result of epidemiological transition, the health systems of low- and middle-income countries are increasingly faced with a dual disease burden of infectious diseases and emerging non-communicable diseases. Little is known about the mutual influence of these two disease groups. The aim of this study was to investigate the co-occurrence of helminth infections and diabetes mellitus in adults in Lao People’s Democratic Republic (Lao PDR).    Methods  We conducted a cross-sectional study among 1600 randomly selected adults aged 35 and older from four different socio-economical and ecological provinces. Information on socio-demographics, risk factors and health conditions was obtained from personal interviews. Clinical assessments including anthropometry (height, weight, waist and hip circumference) and blood pressure measurements were also conducted. Diabetes was classified based on self-reported diagnoses and a point-of-care glycated haemoglobin (HbA1c) test from finger prick blood samples. Stool samples for helminth diagnosis were examined with formalin-ether concentration technique for intestinal parasitic infections. The independent associations of helminth infections with diabetic status and HbA1c were assessed using multiple regression analyses.    Results  The prevalence of pre-diabetes and diabetes was 37.3% and 22.8%, respectively. Fifty-six percent of diabetic cases were undiagnosed and 85% of diagnosed diabetic cases had poor glycemic control. Participants from rural areas and from southern parts of the country had higher infection rates, with  Opisthorchis viverrini , being the most common helminth infection (30.5%). We found a positive association between  Taenia  spp .  infections and HbA1c (β = 0.117; 95%  CI : 0.042–0.200) and diabetes mellitus risk ( OR  = 2.98; 95%  CI : 1.10–8.05). No other helminth species was associated with glycated hemoglobin.    Conclusions  Hyperglycaemia and diabetic rates in Lao PDR are alarmingly high, but consistent with other high rates in the region. Given the high rates of under-diagnosis and poorly-controlled glycaemia in diabetes mellitus patients, routine diabetes screening and treatment is essential for the local healthcare system. Large longitudinal cohorts integrating biomarkers are warranted in the search of causal diabetes mellitus risk factors in the region. Common intestinal helminth infections, including  O. viverrini,  are unlikely to explain the high diabetes mellitus rates observed .Electronic supplementary material  The online version of this article (10.1186/s40249-018-0488-2) contains supplementary material, which is available to authorized users.

Association between helminth infections and diabetes mellitus in adults from the Lao People’s Democratic Republic: a cross-sectional study