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A 2022 statement from the World Health Organization (WHO), defines the term this way: “Disease X is [used] to indicate an unknown pathogen that could cause a serious international epidemic.”
X-linked severe combined immunodeficiency (X-SCID) is an immunodeficiency disorder in which the body produces very few T cells and NK cells. In the absence of T cell help, B cells become defective. [1] It is an X-linked recessive inheritance trait, stemming from a mutated (abnormal) version of the IL2RG gene located on the X-chromosome.
X-linked lymphoproliferative syndrome (see Duncan Disease) XLSA X-linked sideroblastic anemia: XMEA X-linked myopathy with excessive autophagy: XMEN X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia XP Xeroderma pigmentosa: XSCID X-linked severe combined immunodeficiency: XXX syndrome Triple X syndrome
Wiskott–Aldrich syndrome (WAS) is a rare X-linked recessive disease characterized by eczema, thrombocytopenia (low platelet count), immune deficiency, and bloody diarrhea (secondary to the thrombocytopenia). [1] It is also sometimes called the eczema-thrombocytopenia-immunodeficiency syndrome in keeping with Aldrich's original description in ...
X-linked alpha thalassemia mental retardation syndrome (ATR-X) X-linked dominance; X-linked ichthyosis; X-linked juvenile retinoschisis; X-linked lymphoproliferative syndrome; X-linked mental retardation; X-linked mental retardation and macroorchidism; X-linked mental retardation associated with marXq2; X-linked mental retardation Brooks type
Legg–Calvé–Perthes disease; Legius syndrome; Leiner's disease; Lelis syndrome; Lemierre's syndrome; Lennox–Gastaut syndrome; Lenz microphthalmia syndrome; Lenz–Majewski syndrome; Leriche's syndrome; Leschke syndrome; Lesch–Nyhan syndrome; Lethal congenital contracture syndrome; Lethal white syndrome
Colored scanning electron microscope (SEM) image of SARS-CoV-2, speculated in 2020 as being the first virus to create Disease X [1] [2] [3]. Disease X is a placeholder name that was adopted by the World Health Organization (WHO) in February 2018 on their shortlist of blueprint priority diseases to represent a hypothetical, unknown pathogen.
Ichthyosis (also named fish scale disease) [1] is a family of genetic skin disorders characterized by dry, thickened, scaly skin. [2] The more than 20 types of ichthyosis range in severity of symptoms, outward appearance, underlying genetic cause and mode of inheritance (e.g., dominant, recessive , autosomal or X-linked ). [ 3 ]