The phrase "and are therefore virtually" is correct and usable in written English.
It can be used to indicate a conclusion or result that follows logically from a previous statement, often implying a near certainty.
Example: "The results of the experiment were consistent across multiple trials, and are therefore virtually conclusive."
Alternatives: "and are thus nearly" or "and are consequently almost".
PiracyData.org, a new website built by folks from the Mercatus Center at George Washington University, highlights a fact that has been too little known for some time: The most popular pirated content is often unavailable for streaming, rental, or digital purchase and is, therefore, virtually impossible to view legally.
Baseline data of healthy LPS-challenged and subsequently MCh-provoked humans are therefore virtually non-existent.
The therapy file is therefore virtually complete, except for prescriptions issued in secondary care and for drugs that are purchased over the counter [ 7].
What drives people to these acts is therefore virtually impossible to determine because there is no common theme and the perpetrators don't leave notes explaining their actions.
The diagnosis of DILI is therefore virtually always presumptive, as it is based on clinical assessment and exclusion of other possible causes rather than on absolute criteria and specific diagnostic tests.
It is therefore virtually impossible for the government to recruit the staff needed for a seven-day NHS, even if it had the money to pay for them.
There is, therefore, virtually no available substance able to specifically target the endothelium; moreover, the results of interventional studies evaluating the effect of cardiovascular drugs on endothelial function vary, depending on the investigated vascular zone and technique and stimulus used.
But the newly-discovered and recently-dated early Maryland and other US east coast Stone Age tools are from between 26,000 and 19,000 years ago - and are therefore contemporary with the virtually identical western European material.
Tissue macrophages are located in virtually every tissue and are therefore uniquely suited to report on local environmental conditions.
