Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (16K11537)
Japan Agency for Medical Research and Development (40105502)
Article History
Received: 13 May 2020
Accepted: 15 September 2020
First Online: 31 October 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of National Institute of Infectious Diseases for usage human saliva in coating plate (IRB approval number: 397). Prior to enrolment, written informed consent was obtained from each subject based on the code of ethics of the World Medical Association (declaration of Helsinki).
: Not applicable.
: The authors declare that they have no competing interest.