Genetic Analysis of Influenza A/H1N1pdm Strains Isolated in Bangladesh in Early 2020
Issued Date
2022-03-01
Resource Type
eISSN
24146366
Scopus ID
2-s2.0-85126021124
Journal Title
Tropical Medicine and Infectious Disease
Volume
7
Issue
3
Rights Holder(s)
SCOPUS
Bibliographic Citation
Tropical Medicine and Infectious Disease Vol.7 No.3 (2022)
Suggested Citation
Hasan A., Sasaki T., Phadungsombat J., Koketsu R., Rahim R., Ara N., Biswas S.M., Yonezawa R., Nakayama E.E., Rahman M., Shioda T. Genetic Analysis of Influenza A/H1N1pdm Strains Isolated in Bangladesh in Early 2020. Tropical Medicine and Infectious Disease Vol.7 No.3 (2022). doi:10.3390/tropicalmed7030038 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/85012
Title
Genetic Analysis of Influenza A/H1N1pdm Strains Isolated in Bangladesh in Early 2020
Other Contributor(s)
Abstract
Influenza is one of the most common respiratory virus infections. We analyzed hemagglutinin (HA) and neuraminidase (NA) gene segments of viruses isolated from influenza patients who visited Evercare Hospital Dhaka, Bangladesh, in early 2020 immediately before the coronavirus disease 2019 (COVID-19) pandemic. All of them were influenza virus type A (IAV) H1N1pdm. Sequence analysis of the HA segments of the virus strains isolated from the clinical specimens and the subsequent phylogenic analyses of the obtained sequences revealed that all of the H1N1pdm recent subclades 6B.1A5A + 187V/A, 6B.1A5A + 156K, and 6B.1A5A + 156K with K209M were already present in Bangladesh in January 2020. Molecular clock analysis results suggested that the subclade 6B.1A5A + 156K emerged in Denmark, Australia, or the United States in July 2019, while subclades 6B.1A5A + 187V/A and 6B.1A5A + 156K with K209M emerged in East Asia in April and September 2019, respectively. On the other hand, sequence analysis of NA segments showed that the viruses lacked the H275Y mutation that confers oseltamivir resistance. Since the number of influenza cases in Bangladesh is usually small between November and January, these results indicated that the IAV H1N1pdm had spread extremely rapidly without acquiring oseltamivir resistance during a time of active international flow of people before the COVID-19 pandemic.