Influenza

Influenza is a contagious respiratory illness caused by influenza viruses. It often begins abruptly with fever, muscle aches, headache, and fatigue.

Influenza virus: A virus that infects the respiratory tract and causes influenza. Its replication in respiratory cells drives infection and transmission.
Influenza vaccine: A vaccine designed to protect against influenza viruses. Vaccination lowers the risk of influenza and severe outcomes.
Orthomyxoviridae: A family of segmented, negative-sense RNA viruses that includes influenza viruses. Influenza viruses belong to this family of respiratory pathogens.
Common cold: A usually mild upper respiratory infection caused by several kinds of viruses. Colds often develop more gradually and cause less severe systemic symptoms.
Viral entry: The process by which a virus attaches to and enters a host cell. Influenza viruses use hemagglutinin to enter susceptible cells.
Antiviral drug: A medicine that prevents viruses from multiplying or spreading in the body. Antiviral medicines can shorten illness when used promptly for eligible patients.
Influenza A virus: An influenza virus type that infects humans and other animals and causes seasonal epidemics and pandemics. It is the type responsible for most influenza pandemics.
COVID-19: An infectious disease caused by SARS-CoV-2, which can affect the respiratory and other body systems. COVID-19 can resemble influenza, but a different virus causes it.
Hemagglutinin: A surface glycoprotein that helps influenza viruses bind to and enter host cells. It attaches viral particles to sialic acid on respiratory cells.
Oseltamivir: An antiviral medicine that inhibits influenza neuraminidase. It is used to treat influenza, especially when treatment begins early.

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