The phrase "are often persistent" is correct and usable in written English.
It can be used to describe something that frequently exhibits persistence or tenacity in various contexts, such as behavior, conditions, or characteristics.
Example: "These issues are often persistent, requiring ongoing attention and management to resolve."
Alternatives: "tend to be persistent" or "frequently remain persistent."
The medical challenges are often persistent and daunting, but the real focus of the new centers is rehabilitation.
Because of the life-saving benefits of statins, we are often persistent in trying all of the available statins (there are six of them).
In volcanically threatened areas, where hazards are often persistent regardless of volcanic activity, community-based monitoring has the potential to reduce risk by providing useful data, fostering collaboration between scientists and communities, and providing a way in which citizens are empowered to take actions to preserve lives and livelihoods.
Dizziness in older people are often persistent and difficult to treat [ 4, 8, 9].
In high-income communities there are often persistent high background levels of CRP in the absence of any demonstrable reason for ongoing inflammation.
They are often persistent and disruptive, may cause public embarrassment for their target and consume the resources of protection services, particularly when ' copy cat' behaviours are triggered.
The initial clue to cancer of the vocal cords is often persistent hoarseness.
Many cases can be treated in this way, but there is often persistent residual asymmetry due to loss of volume that is not corrected by these techniques.
In particular, cloud cover is often persistent over higher-elevation forests of key interest in forest C and watershed assessments.
10.7554/eLife.00662.010 Figure 3. LOH events were often persistent while aneuploidies were often transient.
LOH events were detected in all of the series and were often persistent, recurrent, and associated with increased drug resistance.
