ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Kiruba Ramesh1,2 , Kannapiran Ethiraj1,3, Madhuri Krishnamoorthy1, Kumar Rajendran3, Kaveri Krishnasamy2, Sivasubramanian Srinivasan2and Padmapriya Padmanaban2
1Department of Animal Health and Management, Alagappa University, Karaikudi, Tamil Nadu, India.
2Department of Virology, King Institute of Preventive Medicine and Research, Guindy, Chennai, Tamil Nadu, India.
3Department of Fisheries Science, Alagappa University, Karaikudi, Tamil Nadu, India.
Article Number: 8911 | © The Author(s). 2023
J Pure Appl Microbiol. 2023;17(4):2547-2556.
Received: 11 August 2023 | Accepted: 04 November 2023 | Published online: 02 December 2023
Issue online: December 2023

The preprint of this article can be found here


Influenza viruses are major communicable pathogens responsible for respiratory diseases affecting millions worldwide and denoted by increased morbidity and significant mortality. Antiviral drugs and periodical vaccination are used to control Influenza infections. The utility of currently available drugs is of major concern due to emergence of drug resistance. This necessitates the development of novel antiviral drugs from natural resources. Broad arsenal of highly effective novel anti-influenza drugs can be developed from actinomycetes which have been explored for development of an array of antimicrobials. Fractions of methanol, ethanol, ethyl acetate and aqueous of the Saccharopolyspora jiangxiensis IMA1 were employed to assess the antiviral activity against Oseltamivir resistant influenza A/(H1N1)pdm09 virus. MTT, Plaque Reduction, Quantitative Reverse Transcription Polymerase Chain Reaction (qRT-PCR) and DAPI staining assays were performed to validate the study findings. Selectivity Index value of 18.38µg/ml concentration of the fraction was found to be effective to inhibit the growth of influenza viruses employing the Madin-Darby Canine Kidney cell line. Fraction produced a visually noticeable reduction in cytopathic effect as well as a reduction in viral titre as determined by the reduction in plaque formation. qRT-PCR assay clearly showed a linear relationship between the fraction concentration and the Ct values, demonstrating the virus growth inhibitory activity of the fraction. S.jiangxiensis IMA1 ethyl acetate fraction showed promising antiviral activity as revealed by inhibiting the amplification of influenza virus type A/(H1N1)pdm09. The research findings will be useful for the development of new antiviral drug from the bioactive actinomycetes extractions.


Influenza A/(H1N1) pdm09, Actinomycetes, Antiviral Activity, DAPI Staining, Plaque Assay, qRT-PCR

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© The Author(s) 2023. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.