The phrase "and therefore virtually" is correct and usable in written English.
It can be used to indicate a conclusion or result that is almost or nearly true based on the preceding information.
Example: "The project was completed ahead of schedule, and therefore virtually all team members received a bonus."
Alternatives: "and thus almost" or "and consequently nearly".
"I knew it was funny and therefore virtually unstoppable but I never foresaw a Tony for best musical or such a worldwide hit.
I am usually thrilled to have any seat at a fashion show, and I certainly don't have a problem with the third row, except when there are no risers and therefore virtually no sightlines, as was the case at Givenchy.
Crucially, the Stark broadening of the vibrational transitions induced by the trapping fields is comparable with the laser bandwidth of about 2.5 GHz and therefore virtually all molecules could be addressed by the IR radiation.
Specifically, we create mutant libraries of the HA gene from the H1N1 strain A/WSN/1933 (WSN) that contain virtually all of the ≈4 × 10 possible individual codon mutations, and therefore virtually all of the ≈10 possible amino-acid mutations.
The cost of adverse event treatment in RCC is likely to be less than 2 3% of total costs (Benedict et al, 2009; Remák et al, 2009; Calvo et al, 2010; Thompson Coon et al, 2010), depending on the country in question and, therefore, virtually unimportant for the choice of treatment.
These findings [ 21] confirmed the predicted specificity of true psychotic thought for SC and extended previous reports of the prevalence of transient psychotic-like symptoms in BPD, suggesting that quasi-psychotic thought was a highly discriminant sign and therefore "virtually pathognonomic" for BPD.
Many economists criticize this practice, arguing that 8 percent reflects a fairly high degree of risk, though state pensions are guaranteed by law and are therefore virtually risk free.
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 new agreement binds all of the members of the industry's largest trade group, and therefore covers virtually all of the country's more than 300 million wireless accounts, according to the F.C.C. chairman, Julius Genachowski.
