![]() ![]() Some groups are at greater risk of hospitalization and complications, such as pneumonia and worsening of underlying medical conditions. For more information, refer to COVID-19 signs, symptoms and severity of disease: A clinician guide. ![]() Symptoms of influenza can be similar to symptoms of COVID-19. In some people, especially children, nausea, vomiting and diarrhea may occur. Symptoms can include some or all of the following: Influenza symptoms usually come on suddenly. While most people recover in 3 to 7 days, severe illness can develop, which can result in hospitalization or death. Influenza virus infection causes a wide spectrum of illness, from asymptomatic to severe. Adults may be able to spread influenza to others from 1 day before symptoms start to approximately 5 days after symptoms start.Ĭhildren and people with weakened immune systems may be infectious for longer. The incubation period of influenza is usually 2 days but can range from 1 to 4 days. It may also be transmitted through direct or indirect contact with infected respiratory secretions on surfaces and objects. Influenza is primarily transmitted by droplets and small particle aerosols spread through coughing, sneezing, talking and breathing. Influenza is ranked among the top 10 leading causes of death in Canada.Īccording to data from before the COVID-19 pandemic, each year in Canada, it is estimated that influenza causes approximately:Īccording to data from before the COVID-19 pandemic, every year, worldwide seasonal influenza causes an estimated: More information on approved vaccines for the 2022–2023 influenza season can be found in Appendix A of the Canadian Immunization Guide 2022–2023 seasonal influenza statement. This is known as waning vaccine-induced immunity.Īntigenic drift resulting in possible new formulations of the vaccine and waning vaccine-induced immunity are reasons why the influenza vaccine is recommended before each influenza season. In most seasons, one or more of the strains in the influenza vaccines are changed from the previous season.Īs well, the immune response to seasonal influenza vaccines decreases over time. The ever-present possibility of antigenic drift requires seasonal influenza vaccines to be reassessed annually. Antigenic drift results in multiple strains within an influenza A subtype or B lineage. This is known as antigenic variation, or antigenic drift. Over time, there can be subtle changes in the surface protein of influenza viruses. Of these, the influenza A viruses that have caused widespread human disease have been: Influenza A viruses are classified into subtypes based on 2 surface proteins: Influenza A and B are the main influenza viruses that cause seasonal outbreaks in humans. Get free influenza awareness and educational products Agent of disease Guidance on the use of seasonal influenza vaccine in the presence of COVID-19.Canadian Immunization Guide Chapter on Influenza and Statement on Seasonal Influenza Vaccine for 2022–2023.any further pressure on the health care system during the respiratory virus season, particularly in the context of ongoing COVID-19 activityįor advice regarding the administration of seasonal influenza vaccine, refer to:.the morbidity and mortality associated with influenza.Getting vaccinated against influenza each fall reduces the risk of influenza and serious illness.įor the 2022–2023 influenza season, it is especially important for people to get the influenza vaccine to reduce: Some groups are at a greater risk of influenza-related complications. While most people recover in 3 to 7 days, severe illness can occur. ![]() Influenza is a respiratory illness caused primarily by the influenza A and B viruses.
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