To summarize in even broader strokes, for em Ascaris /em , 10 studies observed protection from malaria, three found an increase of malaria and two found no association at all with malaria. terms of quantitative and qualitative changes in malaria. Background In 1977, lithospermic acid it was reported that malnourished patients heavily infected with em Ascaris lumbricoides /em were free of malaria [1]. In 1978, the same team reported that piperazine treatment of patients with a heavy worm burden of em Ascaris /em was lithospermic acid followed by an increase in malaria attacks [2]. For the following 20 years, there were no other studies on the subject, perhaps for lack of connections between the fields of nutrition and malaria epidemiology or immunology. In the past decade, the topic was rediscovered, this time from an immunological angle. Depending on which publication one reads, it is not clear if the outcome of this interaction is beneficial [3], neutral [4] or harmful [5]. The studies on the interactions between worms and malaria in humans have been very different in design, in the age groups sampled, in the way the malaria outcome and lithospermic acid the exposure to helminths were considered. It is, therefore, impossible to conduct a meta-analysis to settle the matter. Despite these difficulties, the present review aims to synthesize the growing number of studies that have explored the interactions between worms and malaria. Pubmed and google scholar searches were performed for malaria and any of the keywords worms, helminth, em Ascaris /em , hookworm, em Trichuris /em , or em Strongyloides /em . This search identified published papers which were then studied for additional references. Studies in humans (Additional File 1, Table S1) em Ascaris lumbricoides /em and malariaWhen it comes to coinfections between worms and malaria, em Ascaris lumbricoides /em has been the most cited worm. Eight studies found that em Ascaris /em was associated with a reduction of malaria (incidence, prevalence or reduction of parasitemia)[1,2,6-11], two studies found that em Ascaris /em was associated with an increase in malaria prevalence [12,13], and two studies found no relation to malaria [4,14]. For cerebral malaria or renal failure, lithospermic acid two studies identified em Ascaris lumbricoides /em as the only individual worm associated with protection from severe malaria in adults [3,15]. One study observed an increase of severe malaria in em Ascaris /em -infected children [16]. This study is often cited as an example that worms are bad for malaria, but the use of vomiting – which can be caused by em Ascaris /em – as a definition criteria of severe malaria is problematic [17]. Rabbit Polyclonal to GPR37 To summarize in even broader strokes, for em Ascaris /em , 10 studies observed protection from malaria, three found an increase of malaria and two found no association at all with malaria. Another approach to the question compiled national ecologic data on worm prevalence, malaria incidence, climate, and GDP per capita, showed a ten-fold increase in malaria incidence in equatorial climates, low GDP, and em Ascaris lumbricoides /em prevalence 25% relative to prevalence 25% (submitted). Hookworm and malariaHookworms seem to be associated with more malaria. There is a marked spatial overlap between hookworm infections and malaria in Africa [18]. Hookworm is the second most common GI nematode reported to have interactions with malaria. Although there was an apparent potentiation of the lithospermic acid protection associated with em Ascaris /em [3], results often differ from those of co-infections with em Ascaris lumbricoides /em . Seven field studies, and one regression trees analysis of ecological data, finding increased malaria [9,11,12,15,19-21], whereas one study did not find any association between hookworms and malaria [4]. Pooled GI nematodes and malariaBecause of the assumption that the immune response to different helminths has a “stereotypical” profile, some studies pooled GI nematodes together. An increase in incidence was observed in three studies [22-24], a decrease in prevalence was observed in 1 study [25], and no association was observed.