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Influenza A virus subtype H1N1 (A/H1N1) is a subtype of influenza A virus (IAV). Some human-adapted strains of H1N1 are endemic in humans and are one cause of seasonal influenza (flu). [ 1 ] Other strains of H1N1 are endemic in pigs ( swine influenza ) and in birds ( avian influenza ). [ 2 ]
Coughing is the most common symptom. [1] Gastrointestinal symptoms may also occur, including nausea, vomiting, diarrhea, [11] and gastroenteritis, [12] especially in children. The standard influenza symptoms typically last for two to eight days. [13] Some studies suggest influenza can cause long-lasting symptoms in a similar way to long COVID ...
Monovalent type A influenza vaccines are generally indicated during the pandemic or the flu for everyone without contraindications. According to the Advisory Committee on Immunization Practices (ACIP) under the Centre for Disease Control and Prevention (CDC), people aged above 10 are recommended to take one dose of H1N1 vaccine while those who are 6 months to 9 years old should be injected ...
The main treatment for mild influenza is supportive; rest, fluids, and over-the-counter medicines to alleviate symptoms while the body's own immune system works to recover from infection. Antiviral drugs are recommended for those with severe symptoms, or for those who are at risk of developing complications such as pneumonia. [71] [2]
Consult a physician early on for best possible treatment; Remain alert for emergency warning signs [2] Warning signs are symptoms that indicate that the disease is becoming serious and needs immediate medical attention. These include: [citation needed] Difficulty breathing or shortness of breath; Pain or pressure in the chest or abdomen ...
Children are much more infectious than adults and shed virus from just before they develop symptoms until two weeks after infection. [1] [2] The transmission of influenza can be modeled mathematically, which helps predict how the virus will spread in a population. [3] Influenza can be spread in three main ways: [4] [5]
Pandemrix was found to be associated with narcolepsy from observational studies, increasing the risk of narcolepsy by 5-14 times in children and 2-7 times in adults. The increased risk of narcolepsy due to vaccination in children and adolescents was around 1 incident per 18,400 doses. [ 6 ]
In children, the vaccine appears to decrease the risk of influenza and possibly influenza-like illness. [112] In children under the age of two data are limited. [112] During the 2017–18 flu season, the CDC director indicated that 85 percent of the children who died "likely will not have been vaccinated". [113]