Ung, T. thi H., Hoang, P. V. M., Nguyen, S. V., Nguyen, H. L. K., Nguyen, P. thi K., Phan, D. T., Le, T. T., Nguyen, A. P., Nguyen, T. C., Hasebe, F. and Le, M. thi Q. (2022) “Occurrence of the Omicron variant of SARS-CoV-2 in northern Viet Nam in early 2022”, Western Pacific Surveillance and Response, 13(3), p. 5. doi: 10.5365/wpsar.2022.13.3.955.