Influenza A viruses cause yearly seasonal epidemics resulting in a global
burden of 500,000 deaths every year. They are classified by their surface
hemagglutinin and neuraminidase glycoproteins, of which there are 16
types and nine types, respectively. The major subtypes of influenza A
that are currently circulating among people worldwide include H1N1 and
H3N2 viruses. The risk of complications and death is greatly increased
in previously unexposed young children and the elderly (>65 years), due
to their reduced immune function. Interestingly, the majority of severe
cases from the 2009 H1N1 pandemic were reported in children and young
adults, while the elderly population was relatively protected from
infection and severe diseas. This study provided detailed insights into
the age-specific course at the early phase of infection in aged mice and
lung pathology associated with severe influenza virus infection, as well
as, the anti-M2e monoclonal antibody (rM2ss23) effect in preventing
virus release from infected cells as a promising target candidate for
antiviral drug design in highly immunogenic forms.