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Acknowledgments Addition

Posted by fengrongren on 09 Sep 2011 at 02:02 GMT

We thank Von Bing Yap and three anonymous reviewers for constructive criticism and suggestions in the preparation of this manuscript.
http://plosone.org/article/info:doi/10.1371/journal.pone.0018630#article1.back1.ack1.p1

We thank Dr Tadashi Nakasone for providing us precious old sero-positive samples stored and maintained for over 20 years at AIDS Research Center, National Institute of Infectious Disease, Japan.

No competing interests declared.