Intestinal parasites affect millions of children globally. We aimed to assess effects of deworming children on nutritional and cognitive outcomes across potential effect modifiers using individual... Show moreIntestinal parasites affect millions of children globally. We aimed to assess effects of deworming children on nutritional and cognitive outcomes across potential effect modifiers using individual participant data (IPD). We searched multiple databases to 27 March 2018, grey literature, and other sources. We included randomised and quasi randomised trials of deworming compared to placebo or other nutritional interventions with data on baseline infection. We used a random-effects network meta-analysis with IPD and assessed overall quality, following a pre-specified protocol. We received IPD from 19 trials of STH deworming. Overall risk of bias was low. There were no statistically significant subgroup effects across age, sex, nutritional status or infection intensity for each type of STH. These analyses showed that children with moderate or heavy intensity infections, deworming for STH may increase weight gain (very low certainty). The added value of this review is an exploration of effects on growth and cognition in children with moderate to heavy infections as well as replicating prior systematic review results of small effects at the population level. Policy implications are that complementary public health strategies need to be assessed and considered to achieve growth and cognition benefits for children in helminth endemic areas. Show less
The main objective of this thesis is to improve the understanding of the role of helminth infections in the development of insulin resistance, hence type 2 diabetes, and to gain insight into the... Show moreThe main objective of this thesis is to improve the understanding of the role of helminth infections in the development of insulin resistance, hence type 2 diabetes, and to gain insight into the immunological mechanisms underlying this possible interaction. To this end, we initiated a large scale cluster randomized controlled trial, assessing the effect of anthelmintic treatment on insulin resistance and other metabolic, as well as immunological parameters, in a rural area of Indonesia. Deworming significantly reduced the prevalence of helminths, as well as infection intensity. Although treatment did not lead to an increase of whole-body insulin resistance at the community level, a significant increase in insulin resistance was observed among helminth-infected subjects. Furthermore, by comparing immune cells of helminth-infected Indonesians before and after treatment, we gained insight into the specific cell populations that participate in the type 2 and regulatory networks, and show that treatment affects specific cell subsets in these networks. Altogether, the studies described in this thesis show that helminth infections in humans, as well as the administration of helminth molecules in obese mice, have a beneficial effect on the insulin sensitivity, and have shed light on the immunomodulatory effects of helminths. Show less
