tetano
Editor, Senior Moderator
Antiviral Res. 2018 Oct 10. pii: S0166-3542(18)30307-3. doi: 10.1016/j.antiviral.2018.10.009. [Epub ahead of print]
[h=1]Clinical management and viral genomic diversity analysis of a child's influenza A(H1N1)pdm09 infection in the context of a severe combined immunodeficiency.[/h] Pichon M[SUP]1[/SUP], Picard C[SUP]1[/SUP], Simon B[SUP]2[/SUP], Gaymard A[SUP]1[/SUP], Renard C[SUP]3[/SUP], Massenavette B[SUP]4[/SUP], Malcus C[SUP]5[/SUP], Monneret G[SUP]5[/SUP], Morfin-Sherpa F[SUP]1[/SUP], Valette M[SUP]1[/SUP], Javouhey E[SUP]4[/SUP], Millat G[SUP]6[/SUP], Lina B[SUP]1[/SUP], Josset L[SUP]1[/SUP], Escuret V[SUP]7[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]INTRODUCTION:[/h] A child with severe combined immunodeficiency (SCID) had an influenza A(H1N1)pdm09 infection with viral excretion longer than 6 months, during 2013-2014 influenza season, despite cord blood transplantation and antiviral treatments.
[h=4]METHODS:[/h] Conventional real-time RT-PCR methods were used to estimate viral load and to detect the presence of the common N1 neuraminidase (NA) H275Y substitution responsible for oseltamivir resistance. Next-generation sequencing (NGS) of influenza viruses was performed retrospectively to characterize viral quasispecies in specimens.
[h=4]RESULTS:[/h] The patient was first treated with oral oseltamivir, leading to detection of low-levels of NA-H275Y substitution. Concomitant cord blood cell transplantation, intravenous administration of zanamivir and immunoglobulins led to an increase in white blood cells and influenza viral load decrease. A viral rebound occurred as soon as the antiviral treatment was discontinued. Eventually, influenza viral load was negated with immune reconstitution. NGS found influenza quasispecies harboring NA-E119A substitution (10.3%). Moreover, NGS showed that viral genomic diversity evolved under antiviral treatment and immune status.
[h=4]CONCLUSIONS:[/h] Conventional virological techniques were sufficient for influenza infection follow-up but NGS performances allowed characterization of viral variants evolution in this specific case of prolonged influenza virus infection. New and efficient treatments against influenza in immunocompromised patients are needed.
Copyright ? 2018. Published by Elsevier B.V.
[h=4]KEYWORDS:[/h] Influenza A(H1N1)pdm09 virus; Intravenous zanamivir; NA-E119A substitution; NA-H275Y substitution; Next-generation sequencing; Oseltamivir resistance
PMID: 30315875 DOI: 10.1016/j.antiviral.2018.10.009
[h=1]Clinical management and viral genomic diversity analysis of a child's influenza A(H1N1)pdm09 infection in the context of a severe combined immunodeficiency.[/h] Pichon M[SUP]1[/SUP], Picard C[SUP]1[/SUP], Simon B[SUP]2[/SUP], Gaymard A[SUP]1[/SUP], Renard C[SUP]3[/SUP], Massenavette B[SUP]4[/SUP], Malcus C[SUP]5[/SUP], Monneret G[SUP]5[/SUP], Morfin-Sherpa F[SUP]1[/SUP], Valette M[SUP]1[/SUP], Javouhey E[SUP]4[/SUP], Millat G[SUP]6[/SUP], Lina B[SUP]1[/SUP], Josset L[SUP]1[/SUP], Escuret V[SUP]7[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]INTRODUCTION:[/h] A child with severe combined immunodeficiency (SCID) had an influenza A(H1N1)pdm09 infection with viral excretion longer than 6 months, during 2013-2014 influenza season, despite cord blood transplantation and antiviral treatments.
[h=4]METHODS:[/h] Conventional real-time RT-PCR methods were used to estimate viral load and to detect the presence of the common N1 neuraminidase (NA) H275Y substitution responsible for oseltamivir resistance. Next-generation sequencing (NGS) of influenza viruses was performed retrospectively to characterize viral quasispecies in specimens.
[h=4]RESULTS:[/h] The patient was first treated with oral oseltamivir, leading to detection of low-levels of NA-H275Y substitution. Concomitant cord blood cell transplantation, intravenous administration of zanamivir and immunoglobulins led to an increase in white blood cells and influenza viral load decrease. A viral rebound occurred as soon as the antiviral treatment was discontinued. Eventually, influenza viral load was negated with immune reconstitution. NGS found influenza quasispecies harboring NA-E119A substitution (10.3%). Moreover, NGS showed that viral genomic diversity evolved under antiviral treatment and immune status.
[h=4]CONCLUSIONS:[/h] Conventional virological techniques were sufficient for influenza infection follow-up but NGS performances allowed characterization of viral variants evolution in this specific case of prolonged influenza virus infection. New and efficient treatments against influenza in immunocompromised patients are needed.
Copyright ? 2018. Published by Elsevier B.V.
[h=4]KEYWORDS:[/h] Influenza A(H1N1)pdm09 virus; Intravenous zanamivir; NA-E119A substitution; NA-H275Y substitution; Next-generation sequencing; Oseltamivir resistance
PMID: 30315875 DOI: 10.1016/j.antiviral.2018.10.009