To do that the contamination would have to occur in the body before the blood is drawn, and that would make it a human retrovirus.

There is already a large body of evidence to show that this is a human retrovirus.

Just because it can infect humans does not make it a human retrovirus.

They have confirmed the existence of the first viable human endogenous retrovirus.

It's just a human retrovirus, an old one, with a slow but very clever way of reproducing.

Researchers say the microbe, only the third human retrovirus ever found, may be linked to diseases of the immune system.

It was the first identified human retrovirus.

He named the new microbe the "human intracisternal retrovirus."

Researchers there discovered a rare human retrovirus in his blood.

The third human retrovirus causes a kind of leukemia.