LOG:
Changes in viral load are often reported as logarithmic or "log changes." This mathematical term denotes a change in value of what is being measured by a factor of 10. For example, if the baseline viral load by PCR were 20,000 copies/mL plasma, then a 1-log increase equals a 10-fold (10 times) increase, or 200,000 copies/mL plasma. A 2-log increase equals 2,000,000 copies/mL plasma, or a 100-fold increase.
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