Primary Immunodeficiency diseases 

Primary immunodeficiency diseases (PIDD) are a group of more than 300 rare, chronic disorders in which part of the body’s immune system is missing or functions improperly. Individuals with PIDD have a lack of resistance to infections in the body meaning symptoms generally include persistent, recurring internal and external infections that can be difficult to manage. Prevalence is estimated to be from 1 in every 8,500 births to 1 in every 100,000 births worldwide.