Monitoring of human herpesvirus-6 and -7 genomes in saliva samples of healthy adults by competitive quantitative PCR

Nobukiyo Fujiwara, Hikaru Namba, Reiko Ohuchi, Hiroki Isomura, Fumio Uno, Mariko Yoshida, Shiro Nii, Masao Yamada

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Human herpesviruses-6 and -7 (HHV-6 and HHV7) are thought to be transmitted during early infancy through saliva. However, the kinetics of the virus shedding in saliva of healthy adults, from whom children are assumed to acquire the viruses, is mostly unknown. This study was conducted to determine how many copies of the genome are secreted in saliva of healthy adults and to clarify the relationship between viral DNA load and virus isolation of HHV-6 and HHV-7. Competitive PCR was performed using primer sets in the U42 gene of each viral genome. In saliva samples from 29 healthy adults, HHV-6 and HHV-7 DNA was detected in 41.4% and 89.7%, respectively. The average copy number of the HHV-7 genome in the positive samples was higher than that of the HHV-6 genome. Follow-up studies of six seropositive individuals for 3 months showed that the amount of HHV-7 DNA was constant in each individual and that 'high producers' and 'low producers' could be distinguished. By contrast, the amount of HHV-6 DNA varied drastically over time in each individual. Although HHV-6 was never isolated from the saliva of any of the six individuals during the follow-up period, HHV-7 was isolated from each individual several times. The amount of HHV-7 DNA tended to be higher at the times when the virus was isolated than at the times when the virus was not isolated. These data demonstrate a striking contrast between HHV-6 and HHV-7 in the kinetics of genome and virus shedding. (C) 2000 Wiley-Liss, Inc.

Original languageEnglish
Pages (from-to)208-213
Number of pages6
JournalJournal of Medical Virology
Issue number2
Publication statusPublished - 2000


  • HHV-6
  • HHV-7
  • Quantitative PCR
  • Route of transmission
  • Saliva
  • Virus shedding

ASJC Scopus subject areas

  • Virology
  • Infectious Diseases


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