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Oct 3, 2023 · Influenza C virus is detected less frequently and usually causes mild infections, thus does not present public health importance. Influenza D viruses primarily affect cattle and are not known to infect or cause illness in people. Signs and symptoms. Symptoms of influenza usually begin around 2 days after being infected by someone who has the virus.
Influenza viruses are constantly changing, and can infect both humans and animals (birds, pigs, horses). There are several types (namely A, B and C) and subtypes of the Influenza virus. In India, both seasonal influenza and avian influenza (in wild birds, poultry) have been widely reported.
Nov 27, 2009 · Influenza is usually mild and uncomplicated and most people recover without medical treatment. However infection with influenza may occasionally cause severe disease and death, particularly among the elderly, pregnant women, very young children and persons with certain medical conditions (including chronic heart, lung, kidney, liver, blood or metabolic diseases, or weakened immune systems).
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 ...
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.
May 16, 2024 · H5N1 is one of several influenza viruses that causes a highly infectious respiratory disease in birds called avian influenza (or "bird flu"). Infections in mammals, including humans, have also been documented. H5N1 influenza virus infection can cause a range of diseases in humans, from mild to severe and in some cases, it can even be fatal.
May 16, 2024 · Avian influenza, sometimes known as bird flu, is a disease caused by a virus that mainly affects birds but can also affect mammals, including humans. It primarily spreads from infected birds to humans through close contact with birds or contaminated environments, such as in backyard poultry farm settings and at markets where birds are sold.
Influenza, or the flu, is both a seasonal and a pandemic virus. Every year, mainly during the winter season, seasonal influenza infects as many as 1 billion people. This makes it one of the most common infectious respiratory viruses, after the common cold. Thankfully, the WHO Global Influenza Surveillance and Response System, or GISRS, monitors what viruses are circulating and twice a year recommends which viruses to target in the flu vaccine for the upcoming season.
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 on the use of antiviral medications to prevent influenza virus infection in individuals exposed to the virus in the previous 48 hours. This ...
Oct 3, 2023 · Influenza A viruses are established in many animal species. The emergence of an influenza A virus, with the ability to infect people and sustain human-to-human transmission, could cause an influenza pandemic. Influenza type A viruses are classified into subtypes according to the combinations of the proteins on the surface of the virus.
