Study supports immunohistochemistry testing of endometrial tissue HHV-6A Found in Women with Unexplained Infertility HHV-6A was found in 43% of women with unexplained infertility, according to a study published in PLOS Pathogens. (Marci R, et al, 2016.) The study authors found that the virus was present in uterine epithelial cells only, and not the blood. 30 infertile women and 36 fertile (control) women participated in the study. HHV-6B was found in equal amounts in the blood of patients and controls.…