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Both processes are mediated by the expression of members of the clonally variant PfEMP1 parasite protein family on the surface of the IEs. Recent evidence obtained with laboratory-adapted clones indicates that\n                      <jats:italic>P. falciparum<\/jats:italic>\n                      can exploit human serum factors, such as IgM and \u03b1\n                      <jats:sub>2<\/jats:sub>\n                      -macroglobulin (\u03b1\n                      <jats:sub>2<\/jats:sub>\n                      M), to increase the avidity of PfEMP1-mediated binding to erythrocyte receptors, as well as to evade host PfEMP1-specific immune responses. It has remained unclear whether PfEMP1 variants present in field isolates share these characteristics, and whether they are associated with clinical malaria severity. These issues were investigated here.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Children 1\u201312\u00a0years reporting with\n                      <jats:italic>P. falciparum<\/jats:italic>\n                      malaria to Hohoe Municipal Hospital, Ghana were enrolled in the study. Parasites from children with uncomplicated (UM) and severe malaria (SM) were collected. Binding of \u03b1\n                      <jats:sub>2<\/jats:sub>\n                      M and IgM from non-immune individuals to erythrocytes infected by\n                      <jats:italic>P. falciparum<\/jats:italic>\n                      isolates from 34 children (UM and SM) were analysed by flow cytometry. Rosetting in the presence of IgM or \u03b1\n                      <jats:sub>2<\/jats:sub>\n                      M was also evaluated. Experimental results were analysed according to the clinical presentation of the patients.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Clinical data from 108 children classified as UM (n\u2009=\u200954) and SM cases (n\u2009=\u200954) were analysed. Prostration, severe malaria anaemia, and hyperparasitaemia were the most frequent complications. Three children were diagnosed with cerebral malaria, and one child died. Parasite isolates from UM (n\u2009=\u200914) and SM (n\u2009=\u200920) children were analysed. Most of the field isolates bound non-immune IgM (33\/34), whereas the \u03b1\n                      <jats:sub>2<\/jats:sub>\n                      M-binding was less common (23\/34). Binding of both non-immune IgM and \u03b1\n                      <jats:sub>2<\/jats:sub>\n                      M was higher but not significant in IEs from children with SM than from children with UM. In combination, IgM and \u03b1\n                      <jats:sub>2<\/jats:sub>\n                      M supported rosette formation at levels similar to that observed in the presence of 10% human serum.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      The results support the hypothesis that binding of non-immune IgM and\/or \u03b1\n                      <jats:sub>2<\/jats:sub>\n                      M to IEs facilitates rosette formation and perhaps contributes to\n                      <jats:italic>P. falciparum<\/jats:italic>\n                      malaria severity.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12936-020-03438-8","type":"journal-article","created":{"date-parts":[[2020,10,8]],"date-time":"2020-10-08T09:03:14Z","timestamp":1602147794000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Binding of human serum proteins to Plasmodium falciparum-infected erythrocytes and its association with malaria clinical presentation"],"prefix":"10.1186","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9876-0248","authenticated-orcid":false,"given":"Mary","family":"Lopez-Perez","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"van der Puije","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Filip C.","family":"Castberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael F.","family":"Ofori","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars","family":"Hviid","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,10,8]]},"reference":[{"key":"3438_CR1","volume-title":"World malaria report 2019","author":"WHO","year":"2019","unstructured":"WHO. 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