Influenza (Seasonal) - World Health Organization (WHO)
Oct 3, 2023 · However, during periods of low influenza activity or outside of epidemics situations, the infection of other respiratory viruses (e.g. SARS-CoV-2, rhinovirus, respiratory syncytial virus, parainfluenza and adenovirus) can also present as influenza-like illness (ILI), which makes the clinical differentiation of influenza from other pathogens ...
Influenza (flu) - Symptoms and causes - Mayo Clinic
Jan 7, 2025 · Influenza viruses are constantly changing, with new strains appearing often. A person's first flu infection gives some long-term protection against similar strains of flu. But the vaccines offered each year are made to match the flu virus strains that are most likely to …
Influenza (gripe) - Síntomas y causas - Mayo Clinic
Jan 10, 2024 · Los virus de la influenza cambian constantemente y a menudo aparecen nuevas cepas. Si tuviste influenza en el pasado, tu cuerpo ya produjo anticuerpos para combatir esa cepa específica del virus. Si los virus futuros de la influenza son similares a los que ya tuviste debido a la enfermedad o por haber recibido la vacuna, esos anticuerpos ...
Virology of human influenza - World Health Organization (WHO)
May 13, 2010 · Influenza A subtypes and B viruses are further classified by strains. The nomenclature for influenza virus isolates includes the influenza virus type (A or B), host species (omitted if human in origin), geographical site, serial number, year of isolation and, lastly, the H and N variants in brackets. An example of a human isolate is A/Brisbane ...
Influenza seasonal - World Health Organization (WHO)
Oct 16, 2024 · Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. It is characterized by a sudden onset of fever, cough (usually dry), headache, muscle and joint pain, severe malaise (feeling unwell), sore throat and a runny nose. The cough can be severe and can last two or more weeks.
History of influenza vaccination - World Health Organization (WHO)
The H1N1 influenza pandemic that swept across the world from 1918 to 1919, sometimes called “the mother of all pandemics”, involved a particularly virulent new strain of the influenza A virus. The first wave of infections in early 1918 resulted in mild illness, but a second wave later that year was more deadly.
Influenza (flu) - Diagnosis and treatment - Mayo Clinic
Jan 7, 2025 · But a test for flu may be suggested to help guide your care or to know if you could spread the virus to others. A flu test may be done by a pharmacy, your healthcare professional's office or in the hospital. Types of flu tests you may have include: Molecular tests. These tests look for genetic material from the flu virus.
Influenza A (H1N1) virus - Global - World Health Organization …
Jun 19, 2010 · Active transmission of pandemic influenza virus still persists in localized areas of the tropics, particularly in South and Southeast Asia, the Caribbean and West Africa. During the last 2 to 3 weeks, seasonal influenza H3N2 viruses have also been detected at increasing levels in Nicaragua, and low levels or sporadically in Australia, Central ...
Five simple steps to protect against flu - World Health …
Nov 13, 2019 · When an infected person coughs or sneezes, droplets containing the virus can spread as far as one metre, and infect others who breathe them in. If you don’t feel well, stay home. If you’re ill with flu, being around others puts them at risk. This is especially true for people with chronic medical conditions like cancer, heart disease and HIV.
Clinical practice guidelines for influenza - World Health …
Sep 12, 2024 · This WHO Clinical practice guideline for influenza is an update and expansion from the previously published WHO guideline on the clinical management of patients with severe influenza or at risk of severe influenza. These updated guidelines provide recommendations on the management of both severe and non-severe influenza and also includes recommendations …