The phrase "a focus of persistent" is correct and usable in written English.
It can be used when discussing a subject or issue that is consistently emphasized or concentrated on over time.
Example: "The research has been a focus of persistent interest among scientists for decades."
Alternatives: "a point of ongoing" or "an area of continual".
Luis was Luis Bárcenas, a former treasurer in Rajoy's People's party (PP) and the focus of persistent allegations that Spain's ruling party was receiving illegal funding.
Though that commitment has been much romanticized, it has also been the focus of persistent criticism, most vocally from American Indians, who have long regarded the project with a mix of support and suspicion.
The presence of a focus of choroidal inflammation is also suggestive of the possibility that anti-VEGF treatment of CNVs may fail because of underlying persistent inflammation.
Signal intensity changes in response to therapy occur, with a reduction of signal intensity on T2W, which may be a reflection of fibrosis[ 5], although foci of persistent tumour can remain within the low signal area[ 6].
These abnormal foci of persistent nephrogenic cells are regarded as precursor lesions.
Treatment failure was defined as clinical deterioration during hospitalization with hemodynamic instability, confirmation of respiratory failure or the onset thereof, the institution of mechanical ventilation, demonstrated radiological progression of pneumonia or the appearance of a new focus of infection, or persistent fever or the reappearance of fever if a change in treatment was needed [ 28].
With rising health care costs, ever new expensive anticancer drugs being released and a persistent focus of political attention the necessity to provide independent data on the use of resources at the end of life is self-evident.
The north-central region of New Mexico surrounding Santa Fe and Albuquerque was identified as a persistent focus of human plague cases, and it appears to be the predominate region for current cases.
Death was attributed to SAB if there were symptoms and signs consistent with SAB at the time of death, if there was a persistent focus of S. aureus infection at the time of death and/or if the blood culture was positive at the time of death.
Furthermore, multiple isolates from individual patients with persistent blood-stream infection (BSI) revealed identical random amplification of polymorphic DNA profiles, implying that there was either incomplete treatment of an occult focus or persistent carriage of the same bacterium.
