rDNA found in Gardasil is genetically engineered
The rDNA that was found to be contaminating Gardasil is not "natural" rDNA from the HPV virus itself. Rather, it is a genetically engineered form of HPV genetic code that is added to the vaccines during their manufacture.

As Dr. Lee, the pathologist who ran the laboratory tests identifying the biohazard contamination of Gardasil said:

"Natural HPV DNA does not remain in the bloodstream for very long. However, the HPV DNA in Gardasil is not 'natural' DNA. It is a recombinant HPV DNA (rDNA) -- genetically engineered -- to be inserted into yeast cells for VLP (virus-like-particle) protein production. rDNA is known to behave differently from natural DNA. It may enter a human cell, especially in an inflammatory lesion caused by the effects of the aluminum adjuvant, via poorly understood mechanisms. Once a segment of recombinant DNA is inserted into a human cell, the consequences are hard to predict. It may be in the cell temporarily or stay there forever, with or without causing a mutation. Now the host cell contains human DNA as well as genetically engineered viral DNA."