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The study on pathogenesis of influenza B virus during pregnancy is limited. Here, we showed using a mouse model that influenza B virus could cause severe disease including death during pregnancy. Infected pregnant mice resulted in 40% mortality, but infected age-matched non-pregnant mice did not show any death. Infected pregnant mice contained high viral loads in lungs with the elevated inductions...
The in vivo role of alveolar macrophages in the infections with 2009 pandemic H1N1 influenza virus is not as yet known. Ferret study shows that alveolar macrophages are critical for lowering the risk of severe outcomes in 2009 pandemic H1N1 influenza virus infections. Up to 40% of the infected ferrets depleted of alveolar macrophages died, with elevated body temperature and major loss of body weight...
A 2009 H1N1 influenza virus pandemic, which had its origin in swine, caused severe illness and mortality in humans. Inflammatory responses may be responsible for pathogenesis caused by infection with influenza viruses. To better understand the pathogenic mechanism, clinical signs and inflammatory responses in ferrets infected with the pandemic H1N1 were compared with those caused by seasonal H1N1...
H9N2 influenza viruses are endemic in many Asian countries including China and Korea, and cause a considerable economic loss to chicken industry by reduction in egg production and about 30% mortality. Here we developed live cold-adapted attenuated H9N2 influenza vaccine by adaptation of viruses in hen’s eggs at 25°C. Genetic analysis shows that the cold-adapted H9N2 (A/Chicken/Korea/S1/03) viruses...
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