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Antiviral Susceptibility of Influenza A(H5N1) Clade 2.3.2.1c and 2.3.4.4b Viruses from Humans, 2023–2024
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Antiviral Susceptibility of Influenza A(H5N1) Clade 2.3.2.1c and 2.3.4.4b Viruses from Humans, 2023–2024
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Antiviral Susceptibility of Influenza A(H5N1) Clade 2.3.2.1c and 2.3.4.4b Viruses from Humans, 2023–2024
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Journal Article
Antiviral Susceptibility of Influenza A(H5N1) Clade 2.3.2.1c and 2.3.4.4b Viruses from Humans, 2023–2024
2025
Overview
During 2023-2024, highly pathogenic avian influenza A(H5N1) viruses from clade 2.3.2.1c caused human infections in Cambodia and from clade 2.3.4.4b caused human infections in the Americas. We assessed the susceptibility of those viruses to approved and investigational antiviral drugs. Except for 2 viruses isolated from Cambodia, all viruses were susceptible to M2 ion channel-blockers in cell culture-based assays. In the neuraminidase inhibition assay, all viruses displayed susceptibility to neuraminidase inhibitor antiviral drugs oseltamivir, zanamivir, peramivir, laninamivir, and AV5080. Oseltamivir was ≈4-fold less potent at inhibiting the neuraminidase activity of clade 2.3.4.4b than clade 2.3.2.1c viruses. All viruses were susceptible to polymerase inhibitors baloxavir and tivoxavir and to polymerase basic 2 inhibitor pimodivir with 50% effective concentrations in low nanomolar ranges. Because drug-resistant viruses can emerge spontaneously or by reassortment, close monitoring of antiviral susceptibility of H5N1 viruses collected from animals and humans by using sequence-based analysis supplemented with phenotypic testing is essential.
Publisher
U.S. National Center for Infectious Diseases,Centers for Disease Control and Prevention
Subject
/ Animals
/ Antiviral Agents - pharmacology
/ Dogs
/ Humans
/ Identification and classification
/ Influenza A Virus, H5N1 Subtype - classification
/ Influenza A Virus, H5N1 Subtype - drug effects
/ Influenza A Virus, H5N1 Subtype - genetics
/ Influenza, Human - drug therapy
/ Influenza, Human - epidemiology
/ Madin Darby Canine Kidney Cells
/ Mutation
/ Neuraminidase - antagonists & inhibitors
/ Proteins
/ Testing
/ Vaccines
/ Viruses
/ zoonoses
