Words similar to pcv
Example sentences for: pcv
How can you use “pcv” in a sentence? Here are some example sentences to help you improve your vocabulary:
Acyclovir has been in part superceded by the oral prodrugs valaciclovir (VCV) and famciclovir (FCV), the latter being the oral version of PCV [ 20 24 ] . No comparative studies of the emergence of resistance following sub-optimal VCV or FCV have been reported and therefore set out to to select for HSV-1 and HSV-2 isolates resistant to ACV and PCV after using prodrug selection.
Sub-optimal therapy of immunocompetent mice with either VCV or FCV did not readily select for HSV-mutants resistant to either ACV or PCV, suggesting that selection of resistance with either prodrug remains difficult using this system.
The natural phenomenon of spontaneous mutation, which occurs in the absence of drug selection, results in the accumulation of approximately six to eight TK-deficient variants per 10 4plaque-forming viruses in virus populations that have never been exposed to selective pressure [ 6 10 12 ] . Furthermore, HSV-2 clinical isolates were shown to have a higher frequency of spontaneous mutations resistant to ACV and PCV, approximately 30-fold, compared to HSV-1 isolates, and the majority of these mutations are in tk . Consistent with this observation, HSV-2 strains also exhibited approximately a 20- to 80-fold higher spontaneous mutation rate to cidofovir (HPMPC), an inhibitor of HSV Pol, resistance compared with HSV-1 [ 21 ] . Therefore, these naturally-occuring mutations are not unique to tk and TK substrates as detected with antiviral agents ACV and PCV, but were extended with the direct Pol inhibitor, HPMPC, to other loci, most likely pol .
Results were similar for plating efficiency with PCV (data not shown).
Although passage 3 preparation contains a two log increase in resistant virus compared to passage 2, this level is insufficient to significantly increase the IC 50 . Consistent with the failure to establish an infection refractory to treatment, the proportion of resistant virus decreased to 0.08% PCV rand 0.05% ACV rby passage 5.
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