Primary Immunodeficiency Disorders Among North Indian Children

Area of Science:

• Pediatric Immunology
• Clinical Genetics
• Flow Cytometry Applications

Background:

• Primary immunodeficiency disorders (PIDs) are a heterogeneous group of genetic diseases affecting the immune system.
• Diagnosis and management of PIDs in India are challenged by limited awareness and laboratory infrastructure.

Purpose of the Study:

• To determine the distribution of PID categories in North Indian children.
• To identify frequent warning signs and critical evaluation parameters for PIDs.
• To highlight predictors for early PID diagnosis.

Main Methods:

• Retrospective analysis of 528 children under 18 with suspected PIDs.
• Immunophenotyping using flow cytometry to assess immune cell markers.
• Classification of PIDs according to International Union of Immunological Societies (IUIS) criteria.

Main Results:

• 120 children (23%) were diagnosed with PID, with a median diagnosis age of 2.5 years (males) and 3.5 years (females).
• Average diagnostic delay was approximately 5 years; common warning signs included respiratory infections, diarrhea, and failure to thrive.
• Most frequent PIDs were combined humoral and cellular immunodeficiency (29%) and phagocytic defects (29%).
• Family history of PID, consanguinity, and sibling death were significant predictors.

Conclusions:

• The study highlights the distribution and diagnostic challenges of PIDs in North India.
• A step-wise laboratory diagnostic approach is proposed to improve early detection and intervention.
• Increased awareness and improved laboratory support are essential for managing PIDs.