Help make Alexa smarter on Alexa Answers. Sign in with Amazon

Science

What is ultra rare?


2 In contrast, a disease is generally considered to be ultra-rare if it affects one patient per 50,000 people (or, fewer than 20 patients per million of population)3—and most ultra-rare diseases affect far fewer than this—as few as one per million or less.

{{ relativeTimeResolver(1594400372720) }}

LIVE
Points points 223
Rating

Similar Questions
Sign in to view all similar questions
Science 1 Answer
Science 1 Answer

Join Alexa Answers

Help make Alexa smarter and share your knowledge with the world

LEARN MORE