hemophilia B


: a mild to severe hemophilia that is caused by a deficiency of factor IX

called also Christmas disease

compare hemophilia a

Examples of hemophilia B in a Sentence

Recent Examples on the Web About 15 to 20 percent have hemophilia B while the rest have hemophilia A, which is caused by low levels of another protein known as factor VIII. Jonathan Saltzman, BostonGlobe.com, 29 Jan. 2023 The firm plans to begin treating patients with severe hemophilia B in the United States by March 31. Jonathan Saltzman, BostonGlobe.com, 29 Jan. 2023 In November, UniQure won approval for Hemgenix, the first hemophilia B gene therapy. Jason Mast, STAT, 29 Dec. 2022 In 2011, six hemophilia B patients were able to stop or decrease the frequency of their usual injections thanks to gene therapy. Veronique Greenwood, Discover Magazine, 2 Sep. 2014 Pfizer said Thursday that its experimental gene therapy for hemophilia B significantly reduced the number of bleeds patients experienced over a year. Jason Mast, STAT, 29 Dec. 2022 The Food and Drug Administration cleared Hemgenix, an IV treatment for adults with hemophilia B, the less common form of the genetic disorder which primarily affects men. Matthew Perrone, Fortune, 23 Nov. 2022 The type of hemophilia treated here happens to be hemophilia B, which accounts for about 20% cases. Veronique Greenwood, Discover Magazine, 27 June 2011 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hemophilia B.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1954, in the meaning defined above

Time Traveler
The first known use of hemophilia B was in 1954

Dictionary Entries Near hemophilia B

Cite this Entry

“Hemophilia B.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hemophilia%20B. Accessed 8 Dec. 2023.

Medical Definition

hemophilia B

: a mild to severe hemophilia that is caused by a deficiency of factor IX in the blood
Hemophilia B occurs mostly in males.… The inadequate or inactive supply of clotting factor results in periodic internal bleeding.K. A. Fackelmann, Science News

called also Christmas disease

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