PMID- 38484010 OWN - NLM STAT- MEDLINE DCOM- 20240327 LR - 20240328 IS - 1935-2735 (Electronic) IS - 1935-2727 (Print) IS - 1935-2727 (Linking) VI - 18 IP - 3 DP - 2024 Mar TI - Absence of Anti-Babesia microti antibody in commercial intravenous immunoglobulin (IVIG). PG - e0012035 LID - 10.1371/journal.pntd.0012035 [doi] LID - e0012035 AB - BACKGROUND: Babesiosis is a worldwide emerging protozoan infection that is associated with a spectrum of disease severity from asymptomatic infection to severe organ damage and death. While effective treatment strategies are available, some immunocompromised patients experience severe acute and prolonged/relapsing illness due in part to an impaired host antibody response. Intravenous immunoglobulin (IVIG) has been used as an adjunctive therapy in some immunocompromised babesiosis patients, but its therapeutic effect is uncertain. We evaluated the presence of Babesia microti antibodies in commercial samples of IVIG. METHODS/PRINCIPLE FINDINGS: The presence of B. microti antibodies in commercial samples of IVIG were tested using an immunofluorescence assay. A subset of samples was then tested for B. microti antibodies using an enzyme linked immunosorbent assay. Out of 57 commercial IVIG samples tested using IFA, and 52 samples tested using ELISA, none were positive for B. microti antibodies. CONCLUSIONS: Commercially available IVIG may not be of therapeutic benefit for babesiosis patients. Additional sampling of IVIG for B. microti antibody and a clinical trial of babesiosis patients given IVIG compared with controls would provide further insight into the use of IVIG for the treatment of babesiosis. CI - Copyright: This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication. FAU - Kostka, Julia AU - Kostka J AUID- ORCID: 0000-0002-8347-4900 AD - Infectious Disease, UConn Health, Farmington, Connecticut, United States of America. FAU - Maharjan, Anu S AU - Maharjan AS AD - Pathology and Laboratory Medicine, UConn Health, Farmington, Connecticut, United States of America. FAU - Kumar, Sanjai AU - Kumar S AD - Food and Drug Administration, Silver Spring, Maryland, United States of America. FAU - Hackenyos, Douglas AU - Hackenyos D AD - Pharmacy, UConn Health, Farmington, Connecticut, United States of America. FAU - Krause, Peter J AU - Krause PJ AD - Yale School of Public Health and Yale School of Medicine, New Haven, Connecticut, United States of America. FAU - Dieckhaus, Kevin AU - Dieckhaus K AD - Infectious Disease, UConn Health, Farmington, Connecticut, United States of America. LA - eng PT - Journal Article DEP - 20240314 PL - United States TA - PLoS Negl Trop Dis JT - PLoS neglected tropical diseases JID - 101291488 RN - 0 (Immunoglobulins, Intravenous) RN - 0 (Antibodies, Protozoan) SB - IM MH - Humans MH - Immunoglobulins, Intravenous/therapeutic use MH - *Babesiosis/drug therapy MH - *Babesia microti MH - Antibodies, Protozoan MH - Enzyme-Linked Immunosorbent Assay PMC - PMC10965045 COIS- The authors have declared that no competing interests exist. EDAT- 2024/03/14 18:42 MHDA- 2024/03/27 06:43 PMCR- 2024/03/14 CRDT- 2024/03/14 13:54 PHST- 2023/09/28 00:00 [received] PHST- 2024/02/28 00:00 [accepted] PHST- 2024/03/26 00:00 [revised] PHST- 2024/03/27 06:43 [medline] PHST- 2024/03/14 18:42 [pubmed] PHST- 2024/03/14 13:54 [entrez] PHST- 2024/03/14 00:00 [pmc-release] AID - PNTD-D-23-01226 [pii] AID - 10.1371/journal.pntd.0012035 [doi] PST - epublish SO - PLoS Negl Trop Dis. 2024 Mar 14;18(3):e0012035. doi: 10.1371/journal.pntd.0012035. eCollection 2024 Mar.