Statistics from Altmetric.com
Severe combined immunodeficiency (SCID) describes a group of rare genetic disorders characterised by deficient or absent T cell immunity, with an estimated incidence of 1 in 50 000 to 1 in 500 000.1 SCID is considered a paediatric emergency, but early clues, such as lymphopenia, are often not noted.2 As a result, the UK Primary Immunodeficiency Network (UK PIN) recommends that children under 2 years of age with an absolute lymphocyte count (ALC) below 3000/μl must be screened for SCID.3
Competing interests: None.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.