The phrase "an unrecognized cause" is correct and usable in written English.
It can be used when referring to a reason or factor that has not been acknowledged or identified.
Example: "The researchers were puzzled by the symptoms, as they seemed to stem from an unrecognized cause."
Alternatives: "an unidentified reason" or "a hidden factor".
Since diarrheagenic E. coli are not identified by common clinical laboratory techniques, we hypothesized that these organisms might be an unrecognized cause of enteritis in children in the U.S.
This observation led us to hypothesize that this disorder might be an unrecognized cause of kidney disease in that region and prompted us to carry out targeted genetic testing for the p.Glu545Val variant in the local hemodialysis population and family members of identified cases.
But Dr. Gisele Wolf-Klein, a geriatrician at the Parker Jewish Institute for Health Care and Rehabilitation in New Hyde Park, N.Y., said caregiving in general is an unrecognized cause of disease and mortality.
Our findings underscore the need to determine whether orthobunyaviruses represent an unrecognized cause of illness in humans and vertebrate animals in Mexico.
However, repeated evidence of EVEV antibody in persons living at different locales in south Florida (3, 4 ) suggests that EVEV may be an unrecognized cause of febrile illness.
Cryptosporidiosis is likely to be an unrecognized cause of diarrhea in the elderly, perhaps mimicking or occurring in combination with Clostridium difficile (28 ), a well-known agent of diarrheal illness in nursing homes.
In both elderly and immunosuppressed patients, RSV is an often unrecognized cause of LRTI [33 35].
In both elderly and immunosuppressed patients, RSV is an often unrecognized cause of LRTI [ 33- 35].
These results indicate that EVEV is widespread in Florida and may be an important, unrecognized cause of human illness.
Identification of Slc4a3 as underlying a previously unrecognized cause of blindness suggests this gene as a new candidate for a subset of hereditary vitreoretinal retinal degeneration.
With two clinical isolates among a collection of 46, A. minisclerotigenes may be a previously unrecognized cause of aspergillosis in Iran. A. minisclerotigenes was first described as " A. flavus Group II" by Geiser et al. (1998) and formed a distinct clade within a collection of A. flavus isolates from Australian peanut growing soils [ 9].
