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Archives of Virology

, Volume 163, Issue 5, pp 1219–1230 | Cite as

Genetic characterization and diversity of circulating influenza A/H1N1pdm09 viruses isolated in Jeddah, Saudi Arabia between 2014 and 2015

  • Anwar M. Hashem
  • Esam I. Azhar
  • Sarah Shalhoub
  • Turki S. Abujamel
  • Norah A. Othman
  • Abdulwahab B. Al Zahrani
  • Hanan M. Abdullah
  • Maha M. Al-Alawi
  • Anees A. Sindi
Original Article

Abstract

The emerged influenza A/H1N1pdm09 viruses have replaced the previously circulating seasonal H1N1 viruses. The close antigenic properties of these viruses to the 1918 H1N1 pandemic viruses and their post-pandemic evolution pattern could further enhance their adaptation and pathogenicity in humans representing a major public health threat. Given that data on the dynamics and evolution of these viruses in Saudi Arabia is sparse we investigated the genetic diversity of circulating influenza A/H1N1pdm09 viruses from Jeddah, Saudi Arabia, by analyzing 39 full genomes from isolates obtained between 2014-2015, from patients with varying symptoms. Phylogenetic analysis of all gene segments and concatenated genomes showed similar topologies and co-circulation of clades 6b, 6b.1 and 6b.2, with clade 6b.1 being the most predominate since 2015. Most viruses were more closely related to the vaccine strain (Michigan/45/2015) recommended for the 2017/2018 season, than to the California/07/2009 strain. Low sequence variability was observed in the haemagglutinin protein compared to the neuraminidase protein. Resistance to neuraminidase inhibitors was limited as only one isolate had the H275Y substitution. Interestingly, two isolates had short PA-X proteins of 206 amino acids compared to the 232 amino acid protein found in most influenza A/H1N1pdm09 viruses. Together, the co-circulation of several clades and the predominance of clade 6b.1, despite its low circulation in Asia in 2015, suggests multiple introductions most probably during the mass gathering events of Hajj and Umrah. Jeddah represents the main port of entry to the holy cities of Makkah and Al-Madinah, emphasizing the need for vigilant surveillance in the kingdom.

Notes

Funding

This study was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University (KAU), Jeddah, under grant no. (G-484-140-37). The authors, therefore, acknowledge with thanks DSR for technical and financial support.

Compliance with ethical standards

Conflict of interest

Authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all individual participants included in the study.

Supplementary material

705_2018_3732_MOESM1_ESM.xlsx (60 kb)
S1 Table. Detailed amino acid changes in the influenza A/H1N1pdm09 isolates (XLSX 59 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Special Infectious Agent Unit, King Fahd Medical Research CenterKing Abdulaziz UniversityJeddahKingdom of Saudi Arabia
  2. 2.Department of Medical Microbiology and Parasitology, Faculty of MedicineKing Abdulaziz UniversityJeddahKingdom of Saudi Arabia
  3. 3.Department of Medical Laboratory Technology, Faculty of Applied Medical SciencesKing Abdulaziz UniversityJeddahKingdom of Saudi Arabia
  4. 4.Division of Infectious Diseases, Department of MedicineKing Fahd Armed Forces HospitalJeddahKingdom of Saudi Arabia
  5. 5.Molecular Diagnostics LaboratoryKing Fahd Armed Forces HospitalJeddahKingdom of Saudi Arabia
  6. 6.Students’ Research and Innovation Unit, Faculty of MedicineKing Abdulaziz UniversityJeddahKingdom of Saudi Arabia
  7. 7.Infection Control and Environmental Health Unit, Faculty of MedicineKing Abdulaziz University HospitalJeddahKingdom of Saudi Arabia
  8. 8.Department of Anesthesia and Critical Care, Faculty of MedicineKing Abdulaziz UniversityJeddahKingdom of Saudi Arabia

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