severe COVID-19

A COVID-19 that is characterized by any of (1) Oxygen saturation < 90% on room air, (2) Respiratory rate > 30 breaths/min in adults and children > 5 years old, 60 breaths/min in children < 2 months old, 50 in children 211 months old, and 40 in children 15 years old, or (3) signs of severe respiratory distress (accessory muscle use, inability to complete full sentences, and, in children, very severe chest wall indrawing, grunting, central cyanosis, or presence of any other general danger signs.

DNA ligase IV deficiency

A combined T cell and B cell immunodeficiency that has_material_basis_in a mutation in the LIG4 gene, a DNA ligase, encoding a protein essential for V(D)J recombination and DNA double-strand break (DSB) repair through nonhomologous end joining (NHEJ). Patients present with immunodeficiency and developmental and growth delay.