Received: 28 July 2020
Accepted: 24 November 2020
First Online: 1 December 2020
Ethics approval and consent to participate
: The laboratory work was granted approval by the Cambodia National Ethics Committee for Health Research (235 NECHR). Stored isolates used in the study were collected during studies approved by the NECHR (210 NECHR, 289 NECHR, 150 NECHR, 137 NECHR) and the Oxford Tropical Ethics Committee (1009-13, 559-15).
: Not applicable.
: The authors declare that they have no competing interests.