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Influenza, also known as the flu, is an infection caused by influenza viruses. There are three main types – Type A, Type B and Type C. Influenza A(H1N1-2009), Influenza A(H3N2) and Influenza B are influenza viruses commonly circulating globally and in the community.
- Overview
- Signs and Symptoms
- Epidemiology
- Transmission
- Diagnosis
- Treatment
- Prevention
- Vaccines
- Who Response
Seasonal influenza (the flu) is an acute respiratory infection caused by influenza viruses. It is common in all parts of the world. Most people recover without treatment. Influenza spreads easily between people when they cough or sneeze. Vaccination is the best way to prevent the disease. Symptoms of influenza include acute onset of fever, cough, s...
Symptoms of influenza usually begin around 2 days after being infected by someone who has the virus. Symptoms include: 1. sudden onset of fever 2. cough (usually dry) 3. headache 4. muscle and joint pain 5. severe malaise (feeling unwell) 6. sore throat 7. runny nose. The cough can be severe and can last 2 weeks or more. Most people recover from fe...
All age groups can be affected but there are groups that are more at risk than others. 1. People at greater risk of severe disease or complications when infected are pregnant women, children under 5 years of age, older people, individuals with chronic medical conditions (such as chronic cardiac, pulmonary, renal, metabolic, neurodevelopmental, live...
Seasonal influenza spreads easily, with rapid transmission in crowded areas including schools and nursing homes. When an infected person coughs or sneezes, droplets containing viruses (infectious droplets) are dispersed into the air and can infect persons in close proximity. The virus can also be spread by hands contaminated with influenza viruses....
Most cases of human influenza are clinically diagnosed. 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 d...
Most people will recover from influenza on their own. People with severe symptoms or other medical conditions should seek medical care. People with mild symptoms should: 1. stay home to avoid infecting other people 2. rest 3. drink plenty of fluids 4. treat other symptoms such as fever 5. seek medical care if symptoms get worse. People at high risk...
Vaccination is the best way to prevent influenza. Safe and effective vaccines have been used for more than 60 years. Immunity from vaccination goes away over time so annual vaccination is recommended to protect against influenza. The vaccine may be less effective in older people, but it will make the illness less severe and reduces the chance of co...
Vaccines are updated routinely with new vaccines developed that contain viruses that match those circulating. Several inactivated influenza vaccines and recombinant influenza vaccines are available in injectable form. Live attenuated influenza vaccines are available as a nasal spray.
WHO, through the Global Influenza Programme and GISRS, in collaboration with other partners, continuously monitors influenza viruses and activity globally, recommends seasonal influenza vaccine compositions twice a year for the northern and southern hemisphere influenza seasons, guides countries in tropical and subtropical areas as to which formula...
Influenza, commonly known as " the flu " or just " flu ", is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue.
Jan 10, 2024 · Flu, also called influenza, is an infection of the nose, throat and lungs, which are part of the respiratory system. The flu is caused by a virus. Influenza is commonly called the flu, but it's different from the stomach "flu" viruses that cause diarrhea and vomiting.
Nov 9, 2022 · Influenza (flu) is a respiratory virus which is highly contagious. Learn more about the symptoms and the influenza vaccine. Update: You can book a flu vaccination appointment at a participating CHAS GP clinic here.
Mar 30, 2023 · This graphic shows the two types of influenza viruses (A and B) that cause most human illness and that are responsible for flu seasons each year. Influenza A viruses are further classified into subtypes, while influenza B viruses are further classified into two lineages: B/Yamagata and B/Victoria.
6 days ago · Influenza, acute viral infection of the upper or lower respiratory tract, marked by fever, chills, and a generalized feeling of malaise. Influenza is caused by viruses in the family Orthomyxoviridae. Learn more about the classification of influenza viruses, influenza outbreaks, and influenza symptoms and treatment.
