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rare diseases stresses
gen.	редкие заболевания (A rare disease presents a unique problem in treatment because the number of patients with the disease is so small (fewer than 200,000 in the United States) that it is not worthwhile for companies to go through the lengthy and expensive process required for approval and marketing. Drugs produced for such cases are made available under the Orphan Drug Act of 1983, which was intended to stimulate the development of drugs for rare diseases. More than 400 orphan drugs have been designated, but there are about 5,000 rare diseases that remain without treatment. Britannica Alexander Demidov)
rare disease
gen.	орфанное заболевание (A rare disease, also referred to as an orphan disease, is any disease that affects a small percentage of the population. Most rare diseases are genetic, and thus are present throughout the person's entire life, even if symptoms do not immediately appear. Many rare diseases appear early in life, and about 30 percent of children with rare diseases will die before reaching their fifth birthday. With a single diagnosed patient only, ribose-5-phosphate isomerase deficiency is considered the rarest genetic disease. No single cutoff number has been agreed upon for which a disease is considered rare. A disease may be considered rare in one part of the world, or in a particular group of people, but still be common in another. WK Alexander Demidov)
med.	редкое заболевание (igisheva); редкая болезнь (Игорь_2006)

rare diseases : 9 phrases in 3 subjects

Abbreviation	1
General	3
Medical	5