Funding for this research was provided by:
National Institute of Health, department of Medical Sciences, Ministry of Public Health, Thailand
Division of Global Health Protection, Thailand MOPH-US CDC Collaboration
Received: 16 February 2021
Accepted: 17 May 2021
First Online: 5 June 2021
: This work received a non-research determination by CDC as part of routine surveillance work. The Human Research Ethics Committee of Department of Medical Sciences, Ministry of Public Health reviewed this protocol and judged that this study constituted routine public health activities and therefore did not involve human subject research. Written informed consent for participation was not required for this study in accordance with the national legislation and the institutional requirements.
: No individual person’s data was used.
: The authors declare that they have no competing interests.