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Infections in Infants with SCID: Isolation, Infection Screening, and Prophylaxis in PIDTC Centers.

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Infants with severe combined immunodeficiency (SCID) diagnosed by newborn screening (NBS) face more infections before hematopoietic stem cell transplant (HSCT). Evidence-based guidelines are needed for pre-HSCT management following NBS.

Keywords:
Infectionshematopoietic stem cell transplantnewborn screeningprimary immunodeficiencyprophylaxissevere combined immunodeficiency

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Area of Science:

  • Immunology
  • Pediatric Hematology
  • Transplantation Medicine

Background:

  • Severe combined immunodeficiency (SCID) is a group of rare genetic disorders that affect the immune system.
  • Newborn screening (NBS) for SCID aims to enable early diagnosis and treatment, typically hematopoietic stem cell transplant (HSCT).
  • Infections remain a significant concern for infants with SCID prior to HSCT, regardless of diagnosis method.

Purpose of the Study:

  • To determine the incidence and types of infections in SCID patients before HSCT, comparing those diagnosed via NBS versus family history (FH).
  • To assess the variability in pre-HSCT management strategies employed by the Primary Immune Deficiency Treatment Consortium (PIDTC) centers.
  • To identify areas for improvement in infection prevention protocols for SCID infants.

Main Methods:

  • Retrospective analysis of infection data and pre-transplant management in SCID patients treated with HSCT between 2010-2014.
  • Survey of PIDTC centers in 2018 to gather information on their pre-HSCT management practices and protocols.
  • Comparison of infection rates based on diagnosis method (NBS vs. FH) and management setting (outpatient vs. inpatient).

Main Results:

  • Patients diagnosed with SCID via NBS experienced higher rates of infection (55%) before HSCT compared to those diagnosed via FH (19%).
  • The setting of care (outpatient vs. inpatient) did not significantly impact infection rates prior to HSCT.
  • While immunoglobulin replacement and antimicrobial prophylaxis were consistently used, other practices like isolation varied widely among centers.

Conclusions:

  • SCID diagnosis through NBS is associated with a higher risk of pre-HSCT infections compared to FH diagnosis.
  • Significant variability exists in pre-HSCT management protocols across different treatment centers.
  • There is a critical need for standardized, evidence-based guidelines for managing infants with SCID after NBS to optimize HSCT outcomes.