They found that human blood samples contained T cells specific for all 20 versions of the virus. (scientificamerican.com)
The next phase of study involving the newly discovered gene mutations will investigate their function using human blood samples at the molecular level. (sciencedaily.com)
They have been found consistently in wildlife and in human blood samples during biomonitoring tests including those conducted by the U.S. Centers for Disease Control. (scientificamerican.com)