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Differences in multiple immune parameters between Indian and U.S. infants.

Deepak K Rathore1, Tyson H Holmes2,3, Kari C Nadeau2,4

  • 1Pediatric Biology Center, Translational Health Science & Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, Faridabad, Haryana, India.

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Newborn immune cell differences were observed between India and US cohorts, with implications for infection risk. These findings highlight the impact of geography and ethnicity on infant immunity.

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Area of Science:

  • Immunology
  • Human Genetics
  • Pediatrics

Background:

  • Immune system development varies significantly across diverse populations.
  • Understanding geographic and ethnic influences on infant immunity is crucial for public health.

Purpose of the Study:

  • To compare immune cell phenotypes and immunoglobulin levels in newborns from India and the US.
  • To investigate the relationship between specific immune cell frequencies and infection risk in infants.

Main Methods:

  • Analysis of umbilical cord blood from newborns in New Delhi, India, and Stanford, California, using flow cytometry and Luminex.
  • Parallel cohort study design comparing immune markers between the two geographic and ethnic groups.

Main Results:

  • Significant differences in B cell subsets (B-1-like), serum IgM, IgA, and IgG subclasses were found between cohorts.
  • Variations in neutrophil, dendritic cell, T cell, monocyte, and natural killer cell frequencies were observed.
  • In the India cohort, monocytes, total T cells, and memory CD4+ T cells showed an inverse relationship with infant infection risk.

Conclusions:

  • Geographic and ethnic factors significantly influence newborn immune system phenotypes.
  • Specific immune cell profiles may predict infection susceptibility in early infancy.
  • Further research is warranted to explore genetic and environmental determinants of these immune variations.