About the Authors

Akihiro Shimizu

Affiliation Department of Virology, The Jikei University School of Medicine, Tokyo, Japan

Nobuyuki Kobayashi

Affiliation Department of Virology, The Jikei University School of Medicine, Tokyo, Japan

Kazuya Shimada

Affiliation Department of Virology, The Jikei University School of Medicine, Tokyo, Japan

Kuniaki Oura

Affiliation Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan

Tadao Tanaka

Affiliation Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan

Aikou Okamoto

Affiliation Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan

Kazuhiro Kondo

kkondo@jikei.ac.jp

Affiliation Department of Virology, The Jikei University School of Medicine, Tokyo, Japan

Competing Interests

The authors have read the journal's policy and have the following conflicts. Kazuhiro Kondo has submitted an application for a patent on the HHV-6 viral vector (PCT/JP2004/12487). The other authors have declared that no competing interests exist. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: KK AS. Performed the experiments: AS. Analyzed the data: AS NK KS. Contributed reagents/materials/analysis tools: KO TT AO. Wrote the paper: KK AS.