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6 kwi 2021 · Influenza viruses cause annual epidemics and occasional pandemics of respiratory tract infections that produce a wide spectrum of clinical disease severity in humans. The novel betacoronavirus...
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26 wrz 2003 · SARS is an airborne virus and can spread through small droplets of saliva in a similar way to the cold and influenza. It was the first severe and readily transmissible new disease to emerge in the 21 st century and showed a clear capacity to spread along the routes of international air travel.
Thus, some features of SARS CoV-2 and COVID-19 need more study, including an increase in virus-transmission potential and antigenic drift, causes of asymptomatic infection, association of the disease with chronic diseases, and causes of persistent and long-term postinfection effects.
8 paź 2021 · SARS is a serious illness that can lead to death. If you have signs or symptoms of a respiratory infection, or if you have flu-like signs and symptoms with fever after traveling abroad, see your doctor right away. Request an appointment.
Article Info. Download PDF. Summary. Annual seasonal influenza epidemics of variable severity caused by influenza A and B virus infections result in substantial disease burden worldwide. Seasonal influenza virus circulation declined markedly in 2020–21 after SARS-CoV-2 emerged but increased in 2021–22.
31 mar 2022 · Introduction. Seasonal influenza viruses evolve to evade pre-existing immunity and gain competitive advantage via surface protein mutations which yield new antigenic variants 1. Natural selection...
16 kwi 2022 · We examined clinical outcomes of co-infection with influenza viruses, respiratory syncytial virus, or adenoviruses in 212 466 adults with SARS-CoV-2 infection who were admitted to hospital in the UK between Feb 6, 2020, and Dec 8, 2021, using the International Severe Acute Respiratory and Emerging Infection Consortium–WHO Clinical ...
